TOC/References - Notes - Comb - Ion - Cavity - DAQ

News and notable results

2022-01-03

2022

2021-12-22

+C1 75 872 649

+C1 fit fails 75 872 644
-C1 75 845 308

+C1 fit fails, visual 75 872 640
-C1 visual 75 845 305
+C2 75 886 225 (middle of scan, so linecenter and B ok)
-C2 75 831 725
+C4 75 927 124 (left of scan center, B-estimate too high? or two equal peaks?)
-C4 75 790 808 (two equal height peaks?)

+C1  75 872 635 
-C1  75 845 299
C1_center 75 858 967 
B1 4.870979965902372
comb_center 75 858 971

comb_center 75 858 975
+C1 75 872 621
-C1 75 845 310
C1_center 75 858 965 
B1 4.86644 uT

400 us probe, 2 kHz Fourier limit
     linecenter-comb/ASE off    linecenter-comb/ASE on   2020-12-03 result
C1   +42.4 Hz                   -5741.3 Hz               -2683 Hz
C2   -34.1 Hz                   -5167.4 Hz               -2694 Hz
C4   -25.6 Hz                   -3363.8 Hz               -2933 Hz

2021-12-21

nominal freqs in prediction: 1.931939 0.960010 0.913348

18:20 local z= 1.928443  y 0.958707 x 0.911807
17:50 local z= 1.928327  

2020-12-02 measured rempumper shift (AOM units)
C1 -1302 -1381 Hz
C2 -1246 -1448
C4 -1349 -1584

Automatic gaussian fit doesn't work very well, need to do manual fits later. Compare against ID16729 normal peak-search.
comb center 75 858 918 (predicted line-center from comb data and AHM3-model)

Matlab fits
    +A    -A   +R   -R   Rmean
C1  0.49  0.45 1256 1265 1230
C2  0.45  0.50 1131 1127 1129
C4  0.47  0.48 1225 1298 1262

+C1  75.872600, height 50.6, FWHM 1004 Hz AOM
-C1  75.845284, height 48.7, FWHM 955 Hz
C1_center 75.858942 , C1_B 4.867467 uT (comb center 75 858 921)
+C2  75.886185, height 45.5, FWHM 952 Hz (right of scan-center?)
-C2  75.831632, height 50.9, FWHM 875
+C4  75.927077, height 50.4, FWHM 878 (far right of scan-center) - looks OK no big rabi-sidebands now!?
-C4  75.790725, height 45.6, FWHM 991

    Matlab I(30deg)
     +A   -A    +R   -R
C1  0.51 0.44 1151 1236
C2  0.40 0.46 1255 1188
C4  0.40 0.50 1332 1396

     R_artiq( I(30deg) )                       R_artiq( I(28 deg) )
     +C    -C     mean   ratio    tau_pi(us)   +C    -C    mean  ratio   tau_pi(us)
C1   1127  1125   1126     1.0    444          1165  1098  1132  1.0     442
C2   1153  1067   1110     0.986  450          1040  1076                       (repeat +C2 is 1034)
C4   1297  1383   1340     1.19   373          1267  1444  1356  1.20

+C1  75.872515  (-30 Hz from last peak-searc)
-C1  75.845306  (+86 Hz)
C1_center 75.858911, C1_B 4.84825 uT
+C2  75.886099 (-245 Hz)
-C2  75.831737 (+192 Hz)
+C4  75.926920 (-276 Hz)
-C4  75.790861 (+47 Hz)

     R_artiq( I(30deg) )
     +C    -C     mean   ratio    tau_pi(us)
C1   1127  1125   1126     1.0    444
C2   1153  1067   1110     0.986  450
C4   1297  1383   1340     1.19   373

+C1  75.872545
-C1  75.845223 , C1_center 75.858884, C1_B 4.86851 uT (comb center 75 858 911 Hz)
+C2  75.886344
-C2  75.831545
+C4  75.927196  (right of scan range, true B higher than estimate?)
-C4  75.790814  (roughly centered in scan range?)

Polarization once more.
In A-beam (newB) on breadboard after cube, vertical polarization and polarizer reads 48 at minimum (previous notes had 230 = 50 + 180)
Measurement of 674nm beam 'newB' on ASE side of trap, polarizer reads minimum at 18
so beam polarization is 48-18 = 30 degrees from vertical. direction is CCW when moving along beam, so call this -30 degrees
( 2021-12-17 AW result was -26 )

2021-12-20

Predicted voltage changes (change one voltage from null-EMM values) that move ion +/- 3 um
V12cm   +/-  3   V
V12diff +/-  1.2 V
V34cm   +/-  4   V
V34diff +/-  7   V

Scheduled measurements in ARTIQ (hope that moving 50% of above voltages in a single step doesn't kick out ion from trap!?)
scan ranges:
x 910 - 916 kHz, 80 pts
y 955 - 965 kHz, 80 pts
z 1926 - 1936 kHz, 160 pts

Long list of experiments started ca 19:25 on 2021-12-20
x 19:26
y 19:30
z 19:38
new-voltages
x 19:42
ca  4+4+8 min = 16 min/voltage, 49 rows to measure, duration ca 784 minutes = 13 hours
V0 = [ -6.2635, 0.238, 25.0238, 54.9503]  is the EMM-null found by uMotion-optimization

V12cm   V12diff  V34cm    V34diff     change from V0                    xID   yID   zID
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16477 16478 16479
-6.2635  0.2380  25.0238  55.6503     0.0000  0.0000  0.0000  0.7000    16481 16482 16483
-6.2635  0.2380  25.0238  56.3503     0.0000  0.0000  0.0000  1.4000    16485 16486 16487
-6.2635  0.2380  25.0238  57.0503     0.0000  0.0000  0.0000  2.1000    16489 16490 16491
-6.2635  0.2380  25.0238  57.7503     0.0000  0.0000  0.0000  2.8000    16493 16494 16495
-6.2635  0.2380  25.0238  58.4503     0.0000  0.0000  0.0000  3.5000    16497 16498 16499
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16501 16502 16503
-6.2635  0.2380  25.0238  54.2503     0.0000  0.0000  0.0000  -0.7000    16505 16506 16507
-6.2635  0.2380  25.0238  53.5503     0.0000  0.0000  0.0000  -1.4000    16509 16510 16511
-6.2635  0.2380  25.0238  52.8503     0.0000  0.0000  0.0000  -2.1000    16513 16514 16515
-6.2635  0.2380  25.0238  52.1503     0.0000  0.0000  0.0000  -2.8000    16517 16518 16519
-6.2635  0.2380  25.0238  51.4503     0.0000  0.0000  0.0000  -3.5000    16521 16522 16523
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16525 16526 16527
-6.2635  0.2380  25.4238  54.9503     0.0000  0.0000  0.4000  0.0000    16529 16530 16531
-6.2635  0.2380  25.8238  54.9503     0.0000  0.0000  0.8000  0.0000    16533 16534 16535
-6.2635  0.2380  26.2238  54.9503     0.0000  0.0000  1.2000  0.0000    16537 16538 16539
-6.2635  0.2380  26.6238  54.9503     0.0000  0.0000  1.6000  0.0000    16541 16542 16543
-6.2635  0.2380  27.0238  54.9503     0.0000  0.0000  2.0000  0.0000    16545 16546 16547
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16549 16550 16551
-6.2635  0.2380  24.6238  54.9503     0.0000  0.0000  -0.4000  0.0000    16553 16554 16555
-6.2635  0.2380  24.2238  54.9503     0.0000  0.0000  -0.8000  0.0000    16557 16558 16559
-6.2635  0.2380  23.8238  54.9503     0.0000  0.0000  -1.2000  0.0000    16561 16562 16563
-6.2635  0.2380  23.4238  54.9503     0.0000  0.0000  -1.6000  0.0000    16565 16566 16567
-6.2635  0.2380  23.0238  54.9503     0.0000  0.0000  -2.0000  0.0000    16569 16570 16571
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16573 16574 16575
-6.2635  0.3580  25.0238  54.9503     0.0000  0.1200  0.0000  0.0000    16577 16578 16579
-6.2635  0.4780  25.0238  54.9503     0.0000  0.2400  0.0000  0.0000    16581 16582 16583
-6.2635  0.5980  25.0238  54.9503     0.0000  0.3600  0.0000  0.0000    16585 16586 16587
-6.2635  0.7180  25.0238  54.9503     0.0000  0.4800  0.0000  0.0000    16589 16590 16591
-6.2635  0.8380  25.0238  54.9503     0.0000  0.6000  0.0000  0.0000    16593 16594 16595
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16597 16598 16599
-6.2635  0.1180  25.0238  54.9503     0.0000  -0.1200  0.0000  0.0000    16601 16602 16603
-6.2635  -0.0020  25.0238  54.9503     0.0000  -0.2400  0.0000  0.0000    16605 16606 16607
-6.2635  -0.1220  25.0238  54.9503     0.0000  -0.3600  0.0000  0.0000    16609 16610 16611
-6.2635  -0.2420  25.0238  54.9503     0.0000  -0.4800  0.0000  0.0000    16613 16614 16615
-6.2635  -0.3620  25.0238  54.9503     0.0000  -0.6000  0.0000  0.0000    16617 16618 16619
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16621 16622 16623
-5.9635  0.2380  25.0238  54.9503     0.3000  0.0000  0.0000  0.0000    16625 16626 16627
-5.6635  0.2380  25.0238  54.9503     0.6000  0.0000  0.0000  0.0000    16629 16630 16631
-5.3635  0.2380  25.0238  54.9503     0.9000  0.0000  0.0000  0.0000    16633 16634 16635
-5.0635  0.2380  25.0238  54.9503     1.2000  0.0000  0.0000  0.0000    16637 16638 16639
-4.7635  0.2380  25.0238  54.9503     1.5000  0.0000  0.0000  0.0000    16641 16642 16643
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16645 16646 16647
-6.5635  0.2380  25.0238  54.9503     -0.3000  0.0000  0.0000  0.0000    16649 16650 16651
-6.8635  0.2380  25.0238  54.9503     -0.6000  0.0000  0.0000  0.0000    16653 16654 16655
-7.1635  0.2380  25.0238  54.9503     -0.9000  0.0000  0.0000  0.0000    16657 16658 16659
-7.4635  0.2380  25.0238  54.9503     -1.2000  0.0000  0.0000  0.0000    16661 16662 16663
-7.7635  0.2380  25.0238  54.9503     -1.5000  0.0000  0.0000  0.0000    16665 16666 16667
-6.2635  0.2380  25.0238  54.9503     0.0000  0.0000  0.0000  0.0000    16669 16670 16671

   P422      counts/100ms
A  0.62 uW   912 / 10
B  0.5 uW    957 / 12
C  0.55 uW   683 / 14

      counts/100ms
A 0.6uW    910 / 12
B 0.66uW   580 / 13
C 0.65 uW  799 / 14

Device-db file should be moved one folder up - and then artiq-dashboard and artiq-master re-started

NEW coniguration:
    "a_beam": "ttl14",   # horizontal beam, camera side NOT for ionization & loading anymore
    "b_beam": "ttl11",   # 'new B-beam' - use for ionization & loading from now on!
    "c_beam": "ttl15",

Old configuration:
    "a_beam": "ttl11",  # old A used for ionization and loading
    "b_beam": "ttl14",  # old B, had polarization problems.
    "c_beam": "ttl15",

V34cm change    x       y       z
+2              914983  961497  1930748
+1              914371  961031  1931408
0               913724  960500  1932393
-1              912665  959473  1932167 (temperature changes in lab..)

2021-12-19

2021-12-17

   A-   A+   R-    R+
C1 0.51 0.42 702   758
C2 0.46 0.46 889   864
C4 0.46 0.51 1542  1586

Matlab Fits for Amplitude and Rabi freqs, B-beam, I = [-0.8532 2.7827 17.4259]
    A-    A+   R-    R+
C1 0.43  0.54  1954  1981
C2 0.57  0.41  1940  1976
C4 0.57  0.43  1963  2052

 
Matlab Fits for Amplitude and Rabi freqs
    A-    A+   R-    R+
C1 0.41  0.56  2222  2237
C2 0.57  0.41  1708  1691
C4 0.57  0.40  2108  2082

2021-12-16

Analysis of secular results:
[ax ay az] = [-0.001027260759455 0.000624538003714 0.000402718960605], qz = 0.365023572362448

uMotion:
old dV = [1, 0, 1.30, 0.02]
new dV = [1.0000 -0.0022 1.3037 -0.0329]
values close to zero can be rounded to zero?

2021-12-15

Vold = [0, 0.22433, 33.1896, 54.7443]
dV = [1, 0, 1.30, 0.02]  
Vnew = Vold - 6.263535*dV
= [-6.2635, 0.22433, 25.0469924, 54.6190]
EQS_theory = [-0.0664 -0.0166 0.00830] Hz for C1, C2, C4

+C1 75 871 802 (visual approx center)

-C1 75 844 736
+C2 75 885 257
-C2 75 831 291 (why is this peak right of scan-center?)
+C4 75 925 788 (? right of scan center)
-C4 75 790 771 (right of scan center)

New             Old
 5.612043872    5.612
11.188552619    11.19
27.989148111    27.992

2021-12-14

predicted (simple model)                        This run
+C1 75 871 804.52 
-C1 75 844 732.48 
+C2 75 885 258.53 (last clock-run -9 Hz ??)
-C2 75 831 278.47 
+C4 75 925 784.59 
-C4 75 790 752.41 (last clock-run -8 Hz ??)

All frequencies AOM! (25 Hz or 50 Hz AOM offset indicates lock to 50 or 100 Hz side-band?)
           clock-run        spectrum-scan(ID15980)   Delta
C1+ freq:  75 871 804.8     75 871 796               +8 
C1- freq:  75 844 732.7     75 844 737               -5
C2+ freq:  75 885 249.2     75 885 249               0
C2- freq:  75 831 277.2     75 831 288               -10 ?            
C4+ freq:  75 925 784.0     75 925 754               +30 !!?
C4- freq:  75 790 744.3     75 790 759               -15 ?

 
Update AHM3 model from Atomic Bulletin 2021-12
MJD0 = 59544
y0 = 4.47416e-13
y1 = -2.64742e-15
y_AHM3 = y0 + y1*(mjd - MJD0)

422nm laser filter-wheel for attenuating beam
Slot	OD	Transmission %	Linear att. %	Filter
1	0	100.0	0.0	no filter
2	0.1	79.4	20.6	NE501B-A
3	0.2	63.1	36.9	NE502B-A
4	0.4	39.8	60.2	NE504B-A
5	0.5	31.6	68.4	NE505B-A
6	0.6	25.1	74.9	NE506B-A
7	0.7	20.0	80.0	NE507B-A
8	0.8	15.8	84.2	NE508B-A
9	0.9	12.6	87.4	NE509B-A
10	1.0	10.0	90.0	NE510B-A
11	1.3	5.0	95.0	NE513B-A
12	1.5	3.2	96.8	NE515B-A

2021-12-13

based on polarization measurement suggested B-field for equal C1,2,4 sensitivity:

B03 = [1.18465 0.424435 -0.27965]   % residual field at zero currents
I_3.2 = [-0.5988 1.0765 11.7275] mA % abs(B) = 3.2 uT
I_4.8 = [ 1.3378 2.1205 17.0758] mA % abs(B) = 4.8 uT
resulting B-direction is close to vertical [0.3206 0.2738 0.9068]

predicted EQS dnuEQSfh is -14.5875 with V12cm=0, and -0.0640 with V12cm = -6.2 V

Residual fields:
B01 = [1.00994 -0.25657 -0.28325] # 2020-06-12
B02 = [1.08592  1.29155 -0.10010] # 2020-08-19
B03 = [1.18465  0.42444 -0.27965] # 2021-01-26, new muShields

good clock-laser dataset - little or no work in the lab + stable temperature
start 2012-12-10 17:00 local
end   2021-12-13 10:39 local

Computing optical frequencies from beat-note data
    ncomb = 889558
    f0 = -35e6 # NOTE negative f0!!
    frep = 249 999 896 Hz   # comb DDS 19 999 584 Hz ( 1/4 th of difference from 20 MHz goes to rep-rate )
    f_IR = f0 + ncomb*frep - fbeat_ch1

    f_red = 2*f_IR   # usually -330 MHz SRS
    f_ion_breadboard = f_red + 178.5 MHz  # fixed frequency AOM for fiber-noise cancelling, 2*Zeeman_AOM shift (ca 160 MHz) remains to ion line-center
    f_cavity = f_red - 2*drift_DDS  # usually -490 MHz SRS
    
    # ch1 + ch2 sanity check
    fbeat1 + fbeat2 = frep

    # optical frequency from ch2
    f_IR_ch2 = f0 + (ncomb - 1)*frep + fbeat_ch2

2021-12-12

2021-12-11

2021-12-10

inv( Cfit ) = % ID15773 on 2021-12-10
   -0.0022    2.3757    1.8666
    0.2333   -1.4629    0.9545
    0.2048    0.9681   -2.5425

inv( Cfit ) =   % 2021-11-30 result
 -0.0046     2.4796    1.9667
  0.2430    -1.5787    0.7812
  0.2254     1.1646   -3.1975

% compare to 2021-02-17 notes
inv(-1*Cfit) =  % sign is arbitrary..
   -0.0004    2.9735    2.3561
    0.4009   -1.5572   -0.1910
    0.3815    1.1746   -4.2519

2021-12-09

2021-12-08 Wednesday

2021-12-07 Tuesday

ID        num_photons  Py_contrast(unc) Matlab_contrast(unc)
15587     50k          2.43 (0.65)      2.43 (0.67)
15581     100k         2.13 (0.46)      2.13 (0.47)
15582     200k         2.60 (0.43)      2.60 (0.44)
15583     400k         2.20 (0.22)      2.20 (0.23)
15584     800k         2.40 (0.18)      2.40 (0.18)

Variables form ARTIQ program:
clock_probe = 1000 [us]
dt_cool = 30 [ms]
dt_repumper = 35 [ms]
dt_clearout = 5 [ms]
dt_detect = 10 [ms]
dt_detect2 = 10 [ms]
start_delay = 1 [ms]
clock_decay = 1 [ms]
cool_shutter = 5 [ms]
end_delay = 7 [ms]

$ uptime
 09:33:28 up 2594 days, 22:12,  7 users,  load average: 0.07, 0.09, 0.13

2021-12-06 Monday

2021-12-05 Sunday

2021-12-03

2021-12-02

2021-12-01

before Zeeman-AOM cube-splitter ca 54 uW (note beam-splitter BSN04 10:90 R:T for power-monitor has quite high losses(
Maybe some problem with Zeeman-AOM causes strange clock spectra. check also 674nm power.

run2 try to increase 674nm power slightly, and longer probe 1000us
1ms should have 800 Hz FWHM, 400 Hz AOM. Step is 80 Hz AOM, so 5 pts in FWHM.


run1 spectrum with 500us doesn't show much..


Use A-beam
Zeeman AOM line-center prediction now 75.8616 (yesterday rough measurement was 75.8617 MHz - so OK!?)
Set all currents to zero.
Last run of coil-current program has settings (-8.6056, -1.0049, 7.0059) mA.
use AB2021-11 numbers for AHM3 shift. Maser frequency is high by +5e-13, so we observe optical frequencies too low by ca 5e-13*SRS = 200 Hz
(previously AHM3 was too low, and we observed optical frequencies shifted up)

increase piezo-voltage, now beat-note 15.550 MHz - right mode!?
increase piezo-voltage, now beat-note 16.202
turn on clock-laser and comb. initial beat-note 16.855 MHz (2 modes too high beat-note?)

z-secular slightly higher than before
repeatability 1 719 596 - 1 719 594 = 2 Hz !? (experiments run consecutively without delay, duration maybe 2min/experiment)

uMotion A 0.6%, B 0.2%, C 1.4%
09:12local ion is still stored. stop fluorescence monitor

2021-11-30

17:35local leave lab
Leave fluorescence monitor, A-beam

---

no issues with artiq-boxes found
rabi-flop doesn't give sensible results, spectrum with shorter probe doesn't look better?? check thath ARTIQ-boxes are properly locked to 100 MHz!?

from peaks abs(B) = 8.23 uT
measured line-center 75.8617 MHz. Prediction from comb-data is 75.8626 MHz (should include latest AHM3 model?)
+C1 center 75.8848 MHz
-C1 center 75.8386 MHz
double-peak indicates too long probe time?
A-beam 600us spectrum


674nm in A-beam ca 0.58-0.32 = 0.26 uW
this would give abs(B) = 8.4 uT ?
4 jumps at 75.8842 MHz (+C1 ?)
5 jumps at 75.837 MHz (-C1 ?)

ID15348 try to find clock-spectrum with A-beam. 200us probe
A-beam fluorescence quite low: 55/2 counts in 10ms
Prediction for Zeeman AOM line-center is 75.8626 MHz

Repeat Comb-number measurement: (see 2021-10-28)

reprate_DDS    reprate_comb      beatnote1      comb_number
19 999 584     249 999 896       -15 549 941    n1
20 000 713     250 000 178.25    -16 627 505    n1-1   (m=-1)

n1 = (m*frep2 + f02 + fbeat2 - f01 - fbeat1) / (frep1-frep2)
n1 = round( 889557.988485 ) = 889558  (same result as 2021-10-28)

f674 - SRS = 2* ( f01+n1*frep1 + fbeat1 ) - SRS = -330223432.5

reduce piezo-voltage, next TEM00 at at 15.550 MHz - this is the correct one (?), measure comb-number here
reduce piezo-voltage, next TEM00 at 14.897 MHz
reduce piezo-voltage, next TEM00 at 14.245
with rep-rate DDS at 19 999 584 Hz previously correct TEM00 mode was at 15.476 MHz. We are now at 14.231, so 2 modes off?
beatnote moves up when rep-rate adjusted up, so sign is negative
increased piezo-voltage gives TEM00 mode at beat-note of 13 592 465 Hz (spacing -652 489 Hz)
previously correct mode at 15.9947 MHz, and TEM00-spacing at comb 0.6525 MHz - so probably need to move two TEM00 modes higher?
Clock laser on, comb on.
Initial TEM00-mode beat-note at 14 244 954 Hz (not the correct TEM00 mode, most probably)
Maybe good to re-do the comb mode-number measurement

Tuned parameters for fitting of cooling-lineshape

# [start,lower,upper] values for fit
Rc0 = [0.9,0.5,1.65];
Rr2pb0 = [0.2,0.1,1.0];  # old [0.66,0.5,1.2]
scale0 = [450,300,600];

---

z-secular similar to y-day


images rotated to show zero-plane. green/red show sign of contrast.

For notes on the linear uMotion model see for example 2021-02-17
Recently changed to alu-mount and Polaris-mount for B beam, so it may have moved slightly (within mu-metal shield holes)
Changing voltages by column of inv(Cfit) should change only one contrast by 100%

% Micromotion contrast model
% S = C (V - V0)
% S has [A, B, C] contrasts
% V and V0 have voltages [V12dif, V34cm, V34dif]
% V12cm is constant 0 V in recent experiments
inv(Cfit) =   % 2021-11-30 result
 -0.0046    2.4796    1.9667
  0.2430    -1.5787   0.7812
  0.2254     1.1646   -3.1975

% compare to 2021-02-17 notes
inv(-1*Cfit) =  % sign is arbitrary..
   -0.0004    2.9735    2.3561
    0.4009   -1.5572   -0.1910
    0.3815    1.1746   -4.2519

Now get uMotion A 0.7%, B 1%, C 2% ( 100k photons per histogram )
Optimal voltages (Common mode, diff): [ 0.22497105 33.21311168 54.61181913]
ID15337 uMotion optimization 5x5x5 grid, 125pts, 50k photons per histogram
uMotion: A 4.4%, B 5.4%, C 3.9%
ion is still stored
09:30local stop fluorescence monitor

Strong correlation between temperature and B-beam counts. Polarization change from linear to partially circular (in which component?)
NOTE: different sign of correlation between 2021-11-24 and 2021-11-29 measurements.
First measurement had waveplate before B-fiber input (not sure about waveplate orientation)
In the later measurement waveplate was after 422nm-launch on ion breadboard, optimized to zero the lost power in the A-beam polarizing cube

2021-11-29 Monday

Leave 1000ms fluorescence monitor, B-beam

---

Try to improve lorentzian fit by setting limits for parameters to be optimized:

Lorentzian is:
    lorentzian(f, C, A, f0, g) = C + ( A / ( ( f-f0 )**2 + g ) )
    # C = constant background
    # A amplitude
    # f0 center freuency
    # FWHM = 2*sqrt(g)

    #      C  A                                    f0                             g
    fwhm0 = 500e-6 # guess for FWHM in MHz
    p0 = [ 0, np.max(fit_contrast), freq[np.argmax(fit_contrast)], pow(fwhm0/2.0, 2) ]
    p0_lower = [0, 0, freq[0], pow(1.0e-6/2.0, 2)] # lower bound for fit
    p0_upper = [0.2, 1.0, freq[-1], pow(0.01/2.0, 2)]

Example run (for z mode):
p0 = [0, 0.49300631348921775, 1.7173684210526317, 6.25e-08]  # starting point for fit-parameters
p0_lower = [0, 0, 1.715, 2.5e-13]    # lower bound
p0_upper = [0.2, 1.0, 1.72, 2.5e-05] # upper bound

(fit fails)



Detuning scans (0.1 s gate): A: ID15320, B: ID15318, C: ID15316
Background counts (0.1 s gate): A: 26.73, B: 24.66, C: 25.0

uMotion: A: 4.7%, B: 6.4%, C: 2.8%

Reduce beam power: A: 0.7 uW, B: 0.9 uW, C: 0.9 uW

lambda/2 -waveplate moved to in front of 422 delivery collimator, A-beam PBS waste beam power minimized. B-beam extinction ratio now slightly worse, ~18 dB

uMotion A 3.7%, B 2.3%, C 2.6%

C 250couts/10ms - power 7.2uW
B also 300 counts/10ms - power 7.2uW
A-beam ca 300counts/10ms - Power 5.6uW
camera image of ion looks blurry. micromotion?
13:19:10 ion! (4 min 10s)
405nm ca 4 mW
13:15z load with 1.7A

check 461nm dispenser: T = 4.642 kOhm, I = 196.60 mA (no major change from before)
13:11 no ion loaded
12:56z load with 1.6A.
empty trap by RF off/on

Measured at B-beam output (through trap chamber) 20.6 dB
Polarization extinction ratio on ion-breadboard 25.6 dB (after fiber from laser). Only small changes when heating fiber by hand.

try 405nm laser - no ion in 2-3 minutes
try runnign detuning scan? no ion
09:35local coolinglaser on. initially no ion seen..
coolinglaser oscilloscope had freezed - need to improve logging program

2021-11-26

18:10local leave lab.
leave ion trapped without cooling
shut down coolinglaser, clocklaser, comb, PMT

wider spectrum with 200us probe. A-beam

maybe A-beam gives clearer results?

peak-position prediction is [75.88579188 75.84100812 75.9080481 75.8187519 75.97508808 75.75171192]
-C1 at 75.841 and +C1 at 75.8858 would indicate line-center 75.863 and abs(B)=7.98 uT (?)
reduce cooling-laser power, so B PMT counts ca 120/10ms
ID15270 clock spectrum with 200us probe


NOTE: beat-note on spectrum analyzer shows visible jumps when we run the clock-cycle!? From coolinglaser mechanical shutter?? Shakes comb, or maybe 1348nm fiber?

rabiflop suggests tau_pi = 200us
initial clock spectrum, predicted line-center 75.865 MHz. 1000 us probe pulse
-C1 (maybe?) at ca 75.841 MHz / +C1 maybe 75.8858


Coolinglaser power was increased again - maybe 5-7uW in beams now

coil currents (I1, I2, I3) = (-8.6054, -1.0047, +7.005) mA (settings from 2021-02-25?) - abs(B) estimate was 2.26 uT (?)

alu-mount installed, some adjustment of B-objective focus restores roughly same level of fluorescence as before
B-beam objective: 51 mm from mid-shield to lower end of the objective case. Height from breadboard to objective lower edge 158mm
install alu-mount for B-beam

C fluorescence 8520 / 118
B fluorescence 5666 / 76 (heating fiber gives ca 1100/100ms = 11000/1000ms)
A fluorescence 13522 / 87

ID15224 wider span scan, with larger frequency-step. B-beam(?)
we might have the wrong comb-number in the calculations? check what rep-rate was used previously?
lunchbreak..
automated line-center prediction is 75.864 MHz for Zeeman AOM - try to search there?

fbeat1 = 15 994 723 Hz, with rep-rate of 249 999 896.5 Hz
11:25local start clock-laser. found TEM00 mode 1348.052-053 nm is the correct one?




uMotion A 1.7%, B 2.7%, C 1.9%
09:47local stop A-beam fluorescence monitor

2021-11-25

17:36local leave lab.
Leave fluoresecence monitor with A-beam. A polarization should be OK?

back to V34cm = 33.188V

---

ASE power ca 8.3 mW

(x, y, z) = (1.089855, 1.129059, ) MHz
(fit fails..)


ID15207 x-secular
ID15206 y-secular
ID15205 z-secular, same range as before? (now using C-beam)
now uMotion A 21.9%, B 9.5%, C 12.2%
Add +1V to V34cm: 34.188 V

uMotion A 1.8%, B 2.4%, C 0.6%
These at uMotion-optimum set earlier, V12cm = 0.0, [ 0.22942917 33.18804714 54.8568037 ]
results (x, y, z) = (1.089309, 1.128581, 1.721865) MHz. RF rectifier DMM reads 58.6 mV


(fit fails.. python numpy lorentz fit worse than matlab??)
(narrower range, peak centered)

ID15195 1.71-1.73 MHz, 20+15 dB
ID15194 1.12-1.14 MHz, 20+4 dB
ID15193 1.08-1.10 MHz, 20+4 dB
ID15192 20+4 dB lower mode with B-beam. 1.07-1.09 MHz 50pts, 20kphotons/pt
(peak not very well centered in scan)

higher one is ca 1.12775
0+12 dB coarse tickler reveals one mode at ca 1.0883 MHz
notes from 2021-05-19 show coarse tickler with 0+11 dB attenuation
Secular prediction is (x, y, z) = (1.0864, 1.1260, 1.7193 ) MHz

China camera images for A, B, C beams (stack of 0.5s exposures, 30-60s in total)

---

New Standa table installed in the 'mini-lab'.

---

Check time-stamps of these measurements and correlate with RF-rectifier measurements?

Secular frequency slightly lower than yesterday:


uMotion (100k photons): A 0.7%, B 0.5%, C 0.6%
Optimal voltages (Common mode, diff): [ 0.22942917 33.18804714 54.8568037 ] - note when these are auto-applied by the optimizer, manual GUI-program retains old (wrong) values!
11:09 progress 50/125
10:55 local ID15170 run uMotion minimization, 5x5x5 grid, 125 pts. 50 k photons per histogram (maybe need more to accurately find zero?)
uMotion now A 1%, B 2.3%, C 2.8%
10:41 local: stop PMT counter program that was running over night.

fits to data from yesterday:


before installing shields, a photo with Sigma 105mm macro lens (no extension tubes)

Compare to 2019-06-18 photo:

2019-10-30:

2021-11-24

Leave fluorescence monitoring over night
plot updates once per minute

data is in textfile 2021-11-24-counts.txt

---

C-beam power ca 1.7 uW
ID15164 C-beam detuning scan
C-beam Bright / Dark: 14505 / 150


B-beam power ca 2.4-0.9 = 1.5 uW
ID15161 B-beam detuning scan
B-beam Bright / Dark: 131748 / 83.3


A-beam power ca 1.5 uW
ID15157 is detuning scan, A-beam, reduced 422nm power
ID15158 Bright/Dark A-beam 19558 / 117.7

re-locking to Rb-line recovers fluorescence
lost ion while trying to reduce coolinglaser power??

Now about 1uW in B-beam

Now get ca 259 uW onto ion breadboard from coolinglaser - this is maybe 10x too much - misalign laser-ion fiber to get 30uW




ID15153 B-beam, 15 dB DDS attenuation - now fit works
ID15152 repeat B-beam, less DDS attenuation 18dB to get higher correlation peak - fit still fails
ID15151 repeat B-beam, narrower range
ID15150 C-beam
ID15149 B-beam shows much wider resonance (but fit fails..)
ID15148 A-beam has worst cooling for axial mode, so narrowest resonance
coarse sweep shows resonance at 1.727 MHz
Try old secular sweep settings, they might still work? 1.786 - 1.79 MHz, DDS att 22dB - no peak

P_repumper = 8.3 mW

C-beam detuning scan is ID15139, C beam P422 = 7.5 uW
Bright/Dark (ID15140) = 22234.7 / 512 (1000 ms gate)


B-beam detuning scan is ID15137, B beam P422 = 7.1 uW
Bright/Dark (ID15142) = 23283.5 / 61.6 (1000 ms gate)

A-beam detuning scan is ID15135. A beam P422 = 4.4 uW
Bright/Dark (ID15144) = 26363 / 128.1 (1000 ms gate)

B-beam fluorescence weakness may be becaus of polarization-effect?
at [0.0, 0.2273, 33.1706, 54.9760] get A 0.2%, B 1.7%, C 0.4%

Optimal voltages (Common mode, diff): [ 0.22733392 33.17064191 54.97603239]
B-beam now gives weakest fluorescence - realign?
ID15122 uMotion-optimizer, 4x4x4 = 64 pts range [[0.22, 0.24], [32.5, 34.5], [54.1, 56.1]].

at [0, 0.23, 33.5, 55.1] get A 5%, B 0.8%, C 1.5%
ID15115 uMotion-optimizer Optimal voltages (Common mode, diff): [ 0.22903766 33.52124375 55.10656201]
Try [0, 0.2451, 31, 55] -> A 28%, B 23%, C 14%
ID15103 NPL uMotion scan 3x3x3 grid (27pts) Optimal voltages (Common mode, diff): [ 0.25156391 31.7416589 57.15082204]
bias voltages from past experiments were 0.0, 0.2451, 34.2701, 50.0363
repeat C 42%
uMotion with inner+mid shields: A 22%, B 52%, C (very weak now? mid-shield C-hole was blocking beam?)

install middle shield
ion is still stored
Install inner shield
Switch to ASI camera. focus-micrometer at 7.0mm. slight focus difference between intensifier/PCO and ASI cameras

uMotion A 20%, B 47%, C 37%

ASE-beam alignment doesn't give more fluorescence - original alignment was probably OK
counts rise to 300/10ms when detuning set to 208 MHz - so we probably have a lot of micromotion (no shields, old vbias voltages)
rough PMT alignment gives 200 counts/10 ms gate. Note PCO image inverted wrt. china-cam (so PMT pinhole is top left on china-cam, bottom right on PCO)

now all beams give fluorescence!
adjust C-beam to get fluroescence.
C-beam gives no signal (but 0.5" post was loose) no signal at all from A-beam? adjust A-beam and recover fluorescence
fluorescence mostly from B-beam
14:34:30 found ion! turn off dispenser
small A-beam adjustments while dispenser on
14:30:30 try to load again, 1.7A
adjust A-beam alignment using diffraction-pattern of electrodes
no ion
14:12:30 load with 1.6A
PCO camera, 400ms exposure, 4V intensifier gain, lab lights off
Try loading ion with intensifier.

When intentionally unlocking the laser from Rb-line (three points towards end of graph), this shows as reduced VPP/AC noise on CH1, CH2 (laser current) goes out of range of the scope (collected numbers 1e38 = NaN?), and higher DC (lower AC) level on photodiode CH3
TPA current 1.8A, seed laser 68.2 mA


New coolinglaser monitoring plots at bottom of comb page
monitor Rb locking-signal via oscilloscope, now at 192.168.10.56

CH1 (error signal) average should stay close to zero, noise (Vpp) around zero shows that lock is working
CH2 (laser current) should stay bounded - will loose lock if this goes too high or too low (what are the limits?)
CH3 (photodiode) should stay at constant level, proportional to total 422nm power(?)

align camera to electrodes
try intensifier + PCO camera?
08:25 no ion, stop loading
08:15Z try to load with 1.6A

Rb-signal after optimizations
Optical feedback made lines move around a lot, and spacings between the three lines to vary - i.e. tuning laser frequency via laser-current was very non-linear

CH1 (yellow): sat.absorption differential locking-signal
CH2 (blue): laser current drive
CH3 (magenta): photodiode signal

2021-11-23

Shiner Table1, Line ID "i" is 710 962 401 328 kHz
                     Sr+ line 710 962 837.3 MHz  - so AOM-shift to line-center +435.97 MHz

Shiner2007

Further beam-alignment improved Rb-signal a lot!
There seems to be optical feedback from the first surface of the DLI-1 isolator, after 844nm seed laser
mis-aligning isolator removes optical feedback and makes Rb-signal more stable

Rb error-signal still quite unstable and variable

Try lower A/C setting of 20Hz - less air-currents over laser/Rb-cell ?

Seed laser temp 31.5C set-point - change slightly?
check 844nm Linos DLI-1 isolator tuning - in reverse configuration transmitted intensity minimized with tuning-screw
changes in AOM-frequency give changes in beam-direction -> DC-level changes in locking signal
422nm laser tuning..

2021-11-22

375um in from electrode-focus, z-translator at ca 7.0 mm
up/down center between lectrodes.
Inner electrodes in focus when Z-translator at 7.5mm
Thread-lock on SM1 tube and camera T-ring interface

2021-11-19

check camera alignment? need to remove mid-shield for this

11:36 stop dispenser - no ion loaded?
11:27 cooling-laser out of lock? relock
11:24:15: start to load with 1.6A, power 1.6W initially

Bias voltages: V1 -0.2451, V2 +0.2451, V3 -15.7661, V4 +84.3065

1033nm: 70 uW
1092nm: 10.4 mW

trap RF on at 10Vpp from keysight gen ch2. RF-rectifier shows 58 mV on DMM

405nm adjusted to ca 3 mW in A beam

AOM detuning 185 MHz
422nm power in beams now more than before, 4uW A, 5.5 uW B, 6.5 uW C

power 165 uW in A-beam
461nm check against dispenser 196.68mA and 4.642 kOhm

remove outer B-shield, to install camera objective

C-beam post was loose? why? tighten M6 screw

2021-11-18

see also Thorlabs Fabry-Perot Interferometer Tutorial
With R1=inf. and R2= 1.0m get mode-spacing of 92.32 MHz
Tuning R2=1.0247 m gives observed spacing 91.06 MHz
Note FSR/mode-spacing = 5.5, so in principle modes close to TEM00 are:

TEM(N, 0, 0) at 0 MHz
TEM(N, 0, 5)  +455.3 MHz 
TEM(N+1,0,0)  +501.3 MHz
TEM(N, 0, 6)  +546.4 MHz 
(in practice TEM05 and TEM06 are quite weak or not excited at all, if mode-matching and beam-alignment is OK)

TEM00 - TEM01 - TEM02 - TEM03 mode spacing determined as:
91.0650 MHz
91.0587 MHz
91.0770 MHz

Cavity modes given by
f / f_FSR = [q + (1/pi)(m+n+1)*acos(g1*g2) ]
gi = 1 - L / Ri  (R is radius of curvature of mirror i)
L = 0.299012 m (from FSR-measurement 501 304 785 Hz)

For fun, try to measure frequency of non-TEM00 modes of cavity?

comb rep-rate 249 999 896.5 Hz (DDS 19 999 586 Hz)
TEM01 mode (vertical, silghtly tilted to right)    beat1= 28 878 149 Hz
lower piezo-voltage, beatnote goes through zero (changes sign) and for TEM00 get beat1= 16 654 261 (- sign in previous measurements!?)

back to same comb-line as TEM01, now even more piezo voltage TEM02-mode (vertical, tilted to right)
beat1 ca 74 MHz, but this isn't measurable with SDR.
adjust rep-rate to get beat1 within range. rep-rate: 249 999 962.5
TEM02 beat1= 15 696 724 Hz

increase piezo to get TEM03 mode, adjust rep-rate to 250 000 012.5
beat1= 16 757 321
TEM03 intensite seems a bit weak, and variable intensity on camera image

adjust rep-rate down, beat-note moves up (so sign is +)
decrease piezo voltage to go back to TEM02
set DDS 19 999 840, so reprate is 249 999 960 Hz
beat1= 17 920 607 Hz

decrease piezo voltage to find TEM01
set DDS 19 999 630, so rep-rate is now 249 999 907.5 Hz
beat1= 19 093 037 Hz

decrease piezo voltage to find TEM01
DDS now 19 999 440 Hz, so rep-rate 249 999 860 Hz
beat1= 15 814 581

(the later measurements should all be against the same comb-line, with variable rep-rate)

sanity-check, back to old rep-rate of DDS = 19 999 586 Hz, or rep rate of 249 999 896.5 Hz
beat-note changes sign as expected (now -sign)
beat1= -16 654 245 (compare to first TEM00 measurement above)

work on cooling laser...

2021-11-12

unlcok comb rep-rate and f0 locks
M-nir with flip-mirror to RF-lab
15:17 turn off clock-laser
14:06 lock laser again

up to ca 0.7 V after adjusting two last mirrors
up to 0.56-0.57V by adjusting final mirror before cavity
cavity transmission monitor 0.46-0.47V, with BOA-current 401 mA
open cavity doors for adjustments

12:55local stop comb-measurements for visitors etc

re-start CombControl - seems to work
at 10:41 local, computer reports uptime of 6:27 - so rebooted at 04:xx local?? (last datapoint in DB 04:08 local)
looks like menlo-computer rebooted during the night??
ping 192.168.10.18 - does not work
related to reading rep-rate from new menlo comb?
re-start of gnuradio and ZMQ-logger doesn't help?
gnuradio ZMQ logging had failed for some reason?

2021-11-11

12:20local laser jumped to next TEM00 while moving cart in lab - still quite sensitive to mvoement in lab?...

Upgrade Picoscope to latest version from website - to see if that helps
PicoScope program on comb computer had crashed. Out of memory error, PicoScope seems to consume 3.3 GB of memory. Comb computer has 8 GB of memroy installed.
When PicoScope re-started it consumes only 50 Mb of memory.

Laser stayed locked to cavity over night.
Improved input-offset trim on FALC keeps error-signal bounded?
Also computer-control of laser temperature, to keep Fine-1 limited to +/-0.5 V - seems to work?


Cavity frequency during last 16 hours. Note step due to temperature spike in whole MIKES building!?
Cavity frequency (674nm) is computed from measured IR 1348nm at comb and the applied frequency to the double-pass drift-AOM


With A/C setting high enoguh, oscillations go away, at least with no changing heat-load in lab
Some disturbance in whole MIKES building morning of 2021-11-11 - this has large effect on measured laser frequency also (through cavity? or through fiber from laser to comb?)

2021-11-10

Collect 100 samples of Fine-2, and average them together - since signal is noisy. averaged data in DB from about 16:01 local
Connect FALC-monitor, via low-pass filter, to DLC Fine-2, to allow monitoring of this voltage
15:35 local, Fine-in has not drifted much, ca -0.01 V, FALC-monitor average at ca -0.1 V (scope with low-pass filter)
14:20 local re-lock laser with new improved(?) input offset trim
With both FALC-inputs grounded, monitor-output showed almost +3V !? adjust offset so that now monitor-output shows ca -4 mV (trimpot quite sensitive, this is as good as it gets?)
FALC integrator always seems to drift up? Try adjusting input offset pot?

Cavity drift was wildly changing yesterday when doors were closed, now after a short measurement seems to have settled at 10 mHz/s (similar to old values)
11:35 local, increased A/C VFD 40 -> 45 Hz
Try increasing further, to eliminate oscillations?
A/C VFD was increased from 35Hz -> 40 Hz on 2021-11-09 at 14:35 local


40Hz setting gives triangular-shaped T110 oscillation with peak-peak of ca 0.3 C


11:20 local re-lock laser to TEM00

Clock-laser stayed locked until ca 02:15 local
Reason for unlcok is not that fine-1 goes out of range - but something else?
Maybe check alignment into cavity, coupled power in/out, and optimize PDH error signal?

Temperature adjusted by python script in 0.0002 C increments to keep abs(Fine-in) < 0.5 V. Seems to work


With doors closed innermost T-sensor settles around +3...+4 mK higher than with doors open

2021-11-09

Slow adjustment of Toptica temperature seems to work at least initially. Fine-in is a bit noisy, could be better to look at average over past 10min?
Leave laser locked and comb running for the night. abs(Fine-in) should stay < 0.5 V if everything works!?

Try adjusting laser-temperature by 0.0001 C once per minute whenever abs(Fine-in) is too large.
Limit for abs(Fine-in) set to 0.5V while testing
Limits on possible temperature range set to 18...22 C.

max range of Fine-in seems to be +/- 4V ?
sensitivity roughly -0.1 V fine-in / 0.001 C laser temperature
setting temperature to 19.999 C makes fine-in rise to ca 1.52V - timeconstant maybe 10-20s
16:10 local Fine-in ca 1.44V - maybe need to very slowly adjust temperature in order to keep Fine-in voltage limited?

PDH lock FALC output DA2 (Fine-in-1 on DLC) voltage now up to 0.92 V (what is the maximum?)
ca 14:35 local: increase A/C VFD from old settings 35 Hz to new setting 40 Hz - more air flow to eliminate oscillations?
ca 14:30 local: close 4th and final door
As usual total heating power falls from 90 W with doors open to maybe 30 W with doors closed. Takes around 4 hours.


Old results on thermal expansion from SIB04 IonClock project:

y = - alpha * ( T - T0 )**2

Coarse values: alpha = 7(1)e-10, T0=32(1) C
Measured with HeNe laser in steel vacuum tube.

674nm repeated results. Thermalization for 10 days after set-point change.
alpha = 6.2(2)e-10 and T0 = 31.4(2) C

Observed shift at 1348nm is ca 20 Hz - when cavity inner temp changes ca 2 mK.
20 Hz / (0.5 * f_SRS ) = 9e-14

dy = -2*alpha*(T-T0)*dT
with alpha=7e-10, T-T0 = 40 mK and dT = 2 mK get -1.1e-13 

Inner shield temperature sensor over one week:


Laser frequency and lab-temperature seem to be correlated.
Try closing all doors and/or stabilizing lab temperature


Toptica PDF mpdulation amplitude -0.2 dBm, phase-shift 57.8571 degrees (from Windows monitor program)
ARC-factor is -0.5 V/V, so PC voltage changes -0.5 V/V based on Fine-in-1 voltage.
Toptica IP 192.168.10.52
Logging from toptica required new install: sudo pip3 install toptica.lasersdk

09:45 local Lock laser again, found TEM00 mode gives beat-note 16.657 MHz

Laser unlocked at some point, found in TEM01 mode.
Comb PicoScope program had crashed during the night

2021-11-08

Leave clock-laser and comb locked, measurement running
Drift-changes during the day are significant? But one door of cavity-box is still open..
ARTIQ drift-dds adjusts to the measured value of 2h drift - but this means the applied drift-correction always lags behind a bit

---

Make a list of TEM00 modes in the cavity and their beat-notes?
Comb frep_dds = 19 999 896 Hz -> frep = 249 999 896.5 Hz
TEM00 modes of the cavity appear at similar beat-note frequencies because FSR of cavity is ca 500 MHz, and comb-spacing is 250 MHz in IR, ca 500 MHz in red
Old measurement of TEM00 FSR was 501.305 MHz -> should give 652.5 kHz shift of beat-note for each TEM00-mode with 250 MHz rep-rate

fbeat1 
17 962 088 Hz    Delta-from-last   (start, 5min measurement, only valid datapoints)
17 309 598 Hz    -652 490 Hz       (increase ECDL piezo-voltage)
16 657 106 Hz    -652 492 Hz       (ECDL piezo 51.856V)
16 004 610 Hz    -652 496 Hz       (piezo 53.033V)
15 352 114 Hz    -652 496 Hz       (piezo 54.202V)

Cavity FSR for 674nm seems to be 2*(249 999 896.5 + 652 496 ) = 501 304 785 Hz (in agreement with old estimate 501.305 MHz)
Note uncompensated laser will drift during a 300s measurement by maybe 20 mHz/s*300s = 6 Hz!
Currently not sure how well AOM driftcomp matches true drift of cavity

2021-11-05

close 3 out of 4 doors of the clock-laser, maybe it stays locked better like this?
ARTIQ drift-DDS was re-started (old-setting of -6.050 mHz/s (single-pass 674nm))
if measured 2h drift is within reasonable limits

  drift_low = 2e-3
  drift_high = 30e-3

Then ARTIQ applies the new drift value.

Testing SDR-tracked with lower loop bandwidth of pi/10 - 100 kHz with 2MS/s sampling. (default value was pi/5, 200 kHz using 2 MS/s)
No major change to beat-note sum histogram

Note applied drift of ARTIQ-DDS adjusts to the 2h-drift measurement value (measurement needs to run 2+ hours without disturbances)

Note predicted Zeeman AOM frequency flattens out when drift-correction matches true drift of cavity
(AHM3 model was not updated, need to adjust these values before ion-experiments!)

ADEVs as expected. This could be improved by adding the cavity-ADEV also, but need to merge 1S/s frequency with drift-DDS for this
Add also monitoring of measured rep-rate and f0 from comb?

2021-11-04

Improved beatnote-tracker program was running for 1-2 hours with clock-laser locked
fbeat1 + fbeat2 = freprate seems to hold with low uncertainty
Old 100MHz comb had 5 mHz tolerance for this sum - but now all valid points seem to be within 1 mHz of the programmed rep-rate
histogram of 1 hour (3600 points). Only 4 points are outside the histogram (no people or movement in the lab during measurement)


SDR-tracker now auto-tunes to center the IF frequency near zero.
InfluxDB results now also take into account menlo rep-rate tuning in the valid-flag.

Menlo computer connected to instrument-network: "http://192.168.10.18:8123"
XML-RPC reading of data seems to work from this IP also.

2021-11-03

Work on gnu-radio SDR frequency-counter for beat-notes

pass-tags on ZMQ block gives len(data_str)=27. without tags len(data_str)=8
unpacked with struct.unpack('ff',data_str)

Comb PicoScope problem (not found). Re-plug USB and power (no effect), reboot computer -> issue fixed!?

2021-11-02

SDR RF level.
GUI-sink just after USRP-source shows real signal level (PLL block outputs normalized data?)
peak at ca -77 dB

With comb blocked noise floor: ca -112...-113 dB - this is the noise-level of the photodetector
what are the noise peaks??
noise-floor of SDR-input only is much lower, -140 dB or so

Constellation-display shows signal range ca -0.015 to +0.015
With sine-wave input to SDR the same IQ level achieved at input of 50 mVpp
500mVpp (siglent siggen, 50ohm load) gives ca -0.15 to 0.15 IQ
1 Vpp gives ca -0.31...+0.31 IQ SDR spectrum-peak -19 dB

NOTE: photodetecto output at 250 MHz rep-rate is -4.5 dBm (100kHz RBW) - so we can't amplify a lot here?
Beat-note at 15 MHz has amplitude of -18.3 ... -12 dBm (depends on 1348nm fiber polarization changes? use PM fiber from laser to comb!?)
ZHL-500LN has max output of +5 dBm at 1dB compression - we are now within ~9 dB of this

when detuning far away from the peak, SDR floor ca -111 dB, at peak ca -62 dB, so 'wide-band-SNR' ca 49 dB - ok!?

---

Menlo comb remote data interface?
local CombWatch interface is 127.0.0.1:8123 with "comb" / "system" as username/password (?)
VTT IP is 130.188.45.15
example field to read e.g. "counter0.freqref" should show the DDS value for reprate-lock (around 20 MHz)
password/username set to None in the fibercomb.setup file.
Now we can ask the server for a list of (non-system) methods like this:

import xmlrpc.client

comb_ip = "http://130.188.45.15:8123"

with xmlrpc.client.ServerProxy(comb_ip) as proxy:
        methods = proxy.system.listMethods()
        for m in methods:
                print(m)

and we get an answer:

$ python3 menlo_test.py 
AC1550.Diode.Current
AC1550.Status
XPS_SqueezerGetVoltage
XPS_SqueezerSetVoltage
comb.reprate.synth.getFreq
comb.reprate.synth.setFreq
data.getInfo
data.history.clear
data.history.max
data.history.size
data.last_timestamp
data.query
hello
param.available
param.dir
param.get
param.list
param.query
param.range
param.set
param.type
system.listMethods
system.methodHelp
system.methodSignature
system.multicall

Try reading reprate: (This is the DDS setting, rep-rate is 245MHz + DDS/4)

        h = proxy.hello()
        print(h)

Fiber Comb Control v0.6.16

	rep_set = proxy.comb.reprate.synth.getFreq()
	print(rep_set)

19999584.0

Try listing parameters:

        plist = proxy.param.list()
        for p in plist:
                print(p)

Actuators.AC1550::diodeIset_LDMV1_1
Actuators.AC1550::diodeIset_LDMV1_3
Actuators.AC1550::diodeIset_LDMV1_4
Actuators.PulseLaser::MOTOR1/TARGET
Actuators.PulseLaser::MOTOR2/TARGET
Actuators.PulseLaser::MOTOR3/TARGET
Actuators.PulseLaser::TEC0/TSET
Actuators.PulseLaser::diodeIset_1
Actuators.PulseLaser::diodeIset_2
Actuators.PulseLaser::diodeIset_3
Actuators.PulseLaser::diodeIset_4
Actuators.PulseLaser::diodeIset_5
Actuators.PulseLaser::diodeIset_6
Actuators.PulseLaser::diodeIset_7
Actuators.PulseLaser::diodeIset_8
Actuators.SYNCRO_RRE::DDS0/FREQ
Actuators.SYNCRO_RRE::LOCKBOX/INOFFSET
Actuators.SYNCRO_RRE::LOCKBOX/OFFSET
Actuators.SYNCRO_RRE::LOCKBOX/SLOWINT/OFFSET_OUT
Actuators.SYNCRO_XPS::DDS0/FREQ
Actuators.SYNCRO_XPS::LOCKBOX/INOFFSET
Actuators.SYNCRO_XPS::LOCKBOX/OFFSET
Actuators.SYNCRO_XPS::LOCKBOX/SLOWINT/OFFSET_OUT
BeatCW1.Amplifier
Counter.BeatCW1
Counter.BeatCW1.Deadtime
Counter.BeatCW1.Phase
Counter.BeatCW1.Timestamp
Counter.Offset
Counter.Offset.Deadtime
Counter.Offset.Phase
Counter.Offset.Timestamp
Counter.Reprate
Counter.Reprate.Deadtime
Counter.Reprate.Phase
Counter.Reprate.Timestamp
DigInputs.PLOstatus
DigInputs.PulseLaser::interlockErr
DigInputs.PulseLaser::preAmp
DigInputs.SYNCRO_RRE::DIO/IN0
DigInputs.SYNCRO_RRE::DIO/IN1
DigInputs.SYNCRO_RRE::DIO/IN2
DigInputs.SYNCRO_RRE::DIO/IN3
DigInputs.SYNCRO_RRE::DIO/IN4
DigInputs.SYNCRO_RRE::DIO/IN5
DigInputs.SYNCRO_RRE::DIO/IN6
DigInputs.SYNCRO_RRE::DIO/IN7
DigInputs.SYNCRO_RRE::DIO/IN8
PulseLaser.AC
PulseLaser.DC
PulseLaser.Enable
PulseLaser.Locked
Reprate.Actuator
Reprate.Lockbox
Switches.AC1550::LDMV_I
Switches.LAC1550
Switches.PulseLaser::TEC0/ENABLE
Switches.PulseLaser::aux0
Switches.PulseLaser::aux1
Switches.PulseLaser::aux2
Switches.PulseLaser::aux3
Switches.PulseLaser::aux4
Switches.PulseLaser::canFlag
Switches.PulseLaser::shutter
Switches.SYNCRO_RRE::DDS0/ENABLE
Switches.SYNCRO_RRE::TRACKER1/ENABLE
Switches.SYNCRO_RRE::TRACKER1/ToBorderOnly
Switches.SYNCRO_XPS::DDS0/ENABLE
Switches.SYNCRO_XPS::TRACKER1/ENABLE
Switches.SYNCRO_XPS::TRACKER1/ToBorderOnly
XPS.Actuator
XPS.Amplifier
XPS.Lockbox
autostart.done
autostart.done_nonspurious
autostart.messages
autostart.msg
autostart.state
autostart.statenum
autostart.targetRRE
autostart.targetRRE.step
system.health.offending
system.messages

Try reading a parameter:

        x = proxy.param.get("Actuators.SYNCRO_XPS::DDS0/FREQ")
        print(x)
        x = proxy.param.get("Counter.Offset")
        print(x)


35000000.0
34999999.98299992
19999584.00199997

What is the data-function?
data.getInfo() returns a large dict describing data: menlo_getInfo.txt

data history size: 3502
data history max: 3600
data last_timestamp: 1635855968.875568

data.query() seems to return the entire history-buffer as a nested dict
query_output.txt

2021-11-01

Beatnote received with SDR, 2 MS/s
FFT 32 kpts, average N=10
first minimum ca -72 dB, peak ca -38 dB, so peak-SNR ca 34 dB
(what is dynamic range of N210 SDR? should we use more or less gain?)


With these settings (P -6dB, I 20 Hz) SNR with 100 kHz RBW seems to be >47 dB
tace is N=20 average
central peak is ca +35 dB from first minimum


Now keeping Pgain constant at -6 dB, try different I gain settings
I 315Hz (trace D)
I 150Hz (trace C)
I 75 Hz (trace B)
I 20 Hz (trace A)


Try measuring beat-note with different RRE gain settings.
P 18 dB (trace A), 10 dB (B), 2 dB (C), -6 dB (D):
I gain settings constant 315 Hz in these measurements
SA trace average of N=20
C or D seems best?

---

SYNCRO-CEO settings from test-report: P 2d B, I 16000 Hz

Laser temperature setting was ca 23.5C (set too low accidentally?) - set to test-report value 25.5C
Back to RF lock

Connections:
 - Pico D: Monitor RRE
RRE SYNCRO:
 - C1 signal (lower)
 - settings from test-report

Menlo setup/training was on Friday 2021-10-29
Locking to optical reference tested, settings:

Connections:
  - Beat-note RF to back of rack OFD input I

  - PicoScope D: Monitor CW
RRE SYNCRO:
 - Input C2 (top) used 
 - P gain 12.6 dB
 - I gain 20 kHz
 - these P/I gains not optimized, but seems to work.

2021-10-28

Try to measure absolute frequency with new comb
TEM00-mode with wavemeter reading 1348.052 nm
SDR-counter with one channel directly measured, the other through mixer (LO set to 220 MHz)

beat1 moves up when frep moves up
frep_DDS    beat1           beat2
19999584    -15 475 999     +234 523 897  (beat1 moves up when frep moves up)
20000569    +15 470 491     -234 529 651  (beat1 moves down when frep moves up)

frep = 245 MHz + frep_DDS/4
(4th harmonic of rep-rate at 1 GHz is mixed with 980 MHz PLO and then compared to frep_DDS)

beat1 results give n1 = 889557.979 = 889558.
this gives 2*f_IR - SRS = -330.075547 MHz 
m = n2-n1 = -1

sign of f0 seems to be negative.
f0 = -35 MHz

beat2 results give k1 = 889557 (one comb-tooth lower than beat1)
m = k2-k1 = +1
2*f_IR-SRS = -330 075 547 Hz (same result as for beat1)

Eqn for mode-number from Menlo manual

m = n2-n1
Delta1 and Delta2 are uncertainties in measurement of fbeat1 and fbeat2.
Here frep1-frep2 = 250 000 142.25 - 249 999 896 = 246.25 Hz
To compute n1 with uncertainty <<1 we need to measure fbeat1 and fbeat2 with e.g. uncertainty <<25 Hz
This is roughly the maser-limit at 1s of averaging, so averaging for 100s or so gives n1 with low uncertainty.
Note (uncompensated) cavity drift when settled 10 mHz/s, so laser drifts 1 Hz during a 100s measurement.

2021-10-26

Found more 1348nm power from clock-laser -> much better SNR for beat-note
power-meter: -2 dBm clock-laser (was -13 dBm!), comb only -21.5 dBm (M-NIR diode currents reduced, 121mA, N/A, 1.2 A, 308 mA).
>40 dB SNR quite easily achieved

Zoom around one beat-note. Bumps around main peak are from PDH-lock


beat-note tests with new comb. M-NIR free-space output
test-report spec is >35 dB SNR with 100 kHz RBW. Initial try gives ca 20 dB SNR, sensitive to 1348nm-fiber (from clock-laser) bends - replace with PM fiber?
black fiber-power-meter shows -13.2 dBm from clock-laser, and -11.8 dBm with clock-laser + comb-light.
(center peak are beat-notes against N and N+1 comb-mode, right peak is 250 MHz rep-rate)
Detector is Fermionics FD80FC InGaAs photodiode, 5.1 kOhm transimpedance amp (OPA818), with Mini-Circuits ZFL-500LN providing 28 dB postgain

2021-10-08 Friday

Install new Menlo comb

2021-10-06 Wednesday

Move old Menlo comb
Newport table pressure setting is 2 bar

VFD back to old setting 35Hz - seems to give damped(?) oscillations.

2021-10-05 Tuesday

With VFD at 25Hz system seems stable again - but temperature rises when working in lab..

2021-10-04 Monday

At 11:30 local, set KSK105 to 25 Hz
KSK105 -3 floor was on 35 Hz.
Switch on lights ca 10:30 local time.

Note temperature oscillations during the weekend. Monday morning all lights were off (too little heat-load from lamps causes oscillations?)
Old 100 MHz comb also off.

2021-08-20 Friday

Ion still in the trap!

Both RF-monitor and secular frequency show relative change of ca 0.00005/0.06025 = 8e-4, for the 1.8MHz axial frequency this is 1500 Hz.
Compare to oscilloscope resolution at 8-bit which is 1/256 = 4e-3.

Similar settings in late May gave 1.7898 MHz, now ca 1.7885 MHz. NOTE axial mode has lower frequency than normal because V12common = 0V.
Secular axial mode measurements from yesterday, RIDs 15041 - 15072, together with new RF-monitor measured with DMM

2021-08-19 Thursday

ca 14:00Z turn off lasers. turn off PMT. leave ion trapped.

RID 15042 - 15072: secular tickler, axial mode, C-beam

RID 15041: secular tickler, axial mode, C-beam.

RID15036: secular tickler, axial mode 1.781-1.79 MHz with A-beam

u-motions again A 15%, B 25%, C 28%

Fluorescence level changes very much when heating the B-fiber!
Optimize beam alignment A, B, C, ASE - but all were quite ok to begin with..

422 lock to Rb-line is quite unstable. unlocked twice while measuring u-motions etc.

umotions: A: 13% (7 s), B: 13% (15 s), C: 22% (8 s)

set 422-detuning to 208 MHz
11:44Z: Try to load: 1.6A, 1.59 W. Ion! at 11:52:40Z!

Compensation voltages: [-0.24511, +0.24511, -15.7661, +84.3065]

405: 3.3 mW.

ASE powers: 1092: 11.5 mW, 1033: 68 uW

Using ASI camera, no intensifier
Only inner magnetic shield is installed

422nm detuning: 185 MHz.

422nm on ion breadboard in A free-space beam ca 20uW. A-objective 1.5uW, B 2.5 uW, C 1.8 uW

461 power: 440 uW on ion breadboard. Check with Sr dispenser: 196.48 mA, 4.642 kOhm.

---

SUMMER HOLIDAY

---

2021-05-28 Friday

11:50Z Switch lasers off.
11:00Z Switch lasers on. No ion in the trap?

2021-05-26 Wednesday

14:28Z turn off lasers. leave ion trapped

Detuning-scans at V12cm=0V:


NOTE 0.5*axial plotted, to get all datapoints close to eachother

Summary of results:

[-5.8 x 26.6721 x] V -> ( 958830, 1003244, 1975363) Hz
[-5.0 x 27.7201 x] V -> ( 982384, 1025684, 1950869) Hz
[-4.0 x 29.0301 x] V -> (1010912, 1053126, 1919859) Hz
[-3.0 x 30.3401 x] V -> (1038747, 1079756, 1888188) Hz
[-2.0 x 31.6501 x] V -> (1065803, 1105771, 1855910) Hz
[-1.0 x 32.9601 x] V -> (1092152, 1131241, 1823320) Hz
[ 0.0 x 34.2701 x] V -> (1117918, 1156046, 1789792) Hz
V12diff = 0.2451 V constant
V34diff = 50.0363 V constant

shift per volt = (+25800, +24800, -33500)
axial scan 1788-1792 kHz
rhi scan 1154-1158 kHz
rlo scan 1116-1120 kHz

uMotion A 2.6%, B 5.5%, C 7.2%
Set Vbias = [0 x 34.2701 x]

shift per volt = (+25500, -32600)
axial scan 1821-1825 kHz
rhi scan 1130-1134 kHz

uMotion A 3.4%, B 4.1%, C 7.1%
Set Vbias = [-1 x 32.9601 x]

shift per volt = (+2700, +26000, -32300)
axial scan 1854-1858 kHz
rhi scan 1104-1108 kHz
rlo scan 1064-1068 kHz

uMotion A 3.9%, B 2.4%, C 6.9%
Set Vbias = [-2 x 31.6591 x] V

shift per volt = (+27800, +26600, -31700)
axial scan 1887-1891 kHz
rhi scan 1078-1082 kHz
rlo scan 1037-1041 kHz

uMotion A 3.4%, B 3.2%, C 7.3%
Set Vbias = [-3.0 x 30.3401 x]

Observed shift per volt = (+28500, +27400, -31000) Hz
axial scan 1918-1922 kHz
rhi scan 1051-1055 kHz
rlo scan 1009-1013 kHz

uMotion A 4.4%, B 4.6%, C 7.6%
set Vbias = [-4 x 29.0301 x] (x not changed)

Observed shift per volt V12cm (x, y, z) = (+29200, +27700, -31300) Hz
axial scan 1947-1954 kHz
rhi scan 1023-1027 kHz - could use even more tickler than 7dB att
rlo scan 980-984 kHz


uMotion A 4.4%, B 5.1%, C 7%
rlo ca rhi ca +2.7 kHz/0.1V, expect +22 kHz shift
axial ca -3 kHz/0.1V, so expect -24 kHz shift
Set new Vbias = [-5.0 0.2451, 27.7201, 50.0363]

(x, y, z) = (958830, 1003244, 1975363 Hz ) Yesterday: (959049, 1003521, 1975940)

fit fails - too wide scan?

repeat rhi

Vbias = [-5.8 0.2451 26.6721 50.0363]

Detuning scans.
NOTE: figure P422 and P1092 not measured, just guesses. Program doesn't include window-transmission difference for A/B and C beams


uMotion 100kphot: A 4.7% in 13.9s, B 3.7% in 18.9s, C 7.5% in 13.8s

Fit uses -1 MHz correction, so 2*208 - 436 - 1 = -21 MHz (this agrees with the scanned points in the figure)
Is 208 MHz a good set-point for cooling?

ion appears maybe 20s after completed detuning-scan! (only points -23 MHz from 208MHz were scanned, no points in blue direction)
try detuning-scan to get cold ion?
no ion during first 60s with only A-beam, or during about 60s with ABC beams
detuning is 208 MHz
11:06Z turn on lasers.

2021-05-25 Tuesday

synced with gitlab, new secular_prediction.py program

14:25Z lasers off. leave ion trapped

New version 'v2' of detuning-scan program with approximate lineshape fit.
TODO: automatically measure background-counts before or after the scan (or take this from blue-detuned data points?). Add parameters for P422_A,B,C and P1092


uMotion A 6.1% in 10s, B 3.3% in 15.8s, C 4.3% in 10.5s

lasers on, ion still trapped

2021-05-24 Monday

14:31Z turn off lasers. leave ion trapped.

Test how repeatable axial secular results are. RID14875 - RID14884 (10 repeats). each measurement ca 3 minutes.
(measurements via remote desktop, no activity in the lab)

f0 = [1975659, 1975684, 1975645, 1975599, 1975633, 1975598, 1975663, 1975607, 1975562, 1975502]
FWHM = [671, 559, 580, 610, 695, 628, 508, 630, 795, 657]

Standard deviation for resonance frequency ca 50Hz, for FWHM ca 75 Hz.
Systematic effects due to lab temperature change or helres-drift, cooling-laser intensity/polarization are probably (much) larger?

---

Trap parameter results:

Vbias -> [omega_secular x, y, z] (uMotion A, B, C)
[-5.8 0.2451 26.6721 50.0363] -> [ 959049 1003521 1975940] (7.7%, 1.2%, 2.8%)
[-5.9 0.2451 26.5411 50.0363] -> [ 956205 1000753 1978978] (7.1%, 1.6%, 2.5%)
[-6.0 0.2451 26.4101 50.0363] -> [ 953220  997869 1982072] (not measured)
(lunch)
[-6.0 0.2451 26.4101 50.0363] -> [ 952917  997615 1981450] (7.9%, 2.1%, 3.5%)

seculars at V12cm = -5.8 V

get uMotion A 7.7%, B 1.2%, C 2.8% Go to Vbias = [-5.8 0.2451 26.6721 50.0363]

Seculars at V12cm = -5.9 V

get uMotion A 7.1%, B 1.6%, C 2.5%
Go to Vbias = [-5.9 0.2451 26.5411 50.0363] (change is +0.1 * dVbias)

Trap parameter analysis suggests voltage-vector that doesn't change field at ion:
dVbias = [1, 0, 1.31, -0.03] (V34diff change is small - ignore?)

Repeat secular measurement:
953.2 / 997.9 / 1982.1 kHz @ Vbias = [-6 0.2451 26.4101 50.0363], uMotion
(these are +315 PPM / +301 PPM / +339 PPM compared to values measured before lunch )
Ion went dark during axial scan!? (too much tickler with 20+10 dB setting!) Fluorescence recovered with detuning-scan


Lunch

RID14835 C-beam, axial secular mode with C-beam, 20+20 dB
RID14836 C-beam, rhi 20+10 dB scan 995-1000 kHz (peak height 15%, could use less attenuation?)
RID14838 C-beam rlo 20+10 dB scan 950-955 kHz, 50 points (side-to-side blur at resonance in camera image, with good imagination..)
952.9 / 997.6 / 1981.4 kHz


PMT counts with 1000s gate, time-series ca 60s
RID14825 B-beam
RID14827 A-beam
RID14829 C-beam

feels like there is quite a lot of variation in P422
P1092 8.90 mW
422 beam power (signal-background): A 0.55-0.08 uW, B 0.90-0.15 uW, C 0.79-0.07 uW


RID14821 C-beam scan, max 21.7 kcounts, C fluorescence 8859 (1384) / 167 (16)
RID14818 B-beam detuning scan. max 12.7 kcounts, B fluorescence 5531 (228) / 64 (8) bright/dark
RID14815 A-beam detuning scan. max counts ca 21k/1000ms. A fluorescence 9342 (195) / 65 (9) bright/dark.

ID14808 detuning-scan, A-beam, 1000ms gate, -23...+10 MHz from 208 MHz set-point in 60 steps
A-fluorescence in 1000ms is 6854 (240) / 57.3 (8), repeat 5938 (281) / 67 (6)

uMotion A 7.9% in 15.9s, B 2.1% in 17.5s, C 3.5% in 14.5s

This ion loaded Monday 2021-05-17, and spent several nights + the weekend un-cooled.
07:57 ion appeared! after re-locking to Rb-line!? (ionization lasers were on also)
no ion in the trap? (tried 405nm and 461nm lasers also) tried 422 detuning-scan.
07:41Z turn on lasers

Notes on geometry and voltages

Current voltages are from uMotion optimization run 2021-05-18 ID14607 NPL search, [ 0.24512619 26.41013719 50.03631515 ], V12cm = -6 V

2021-05-21 Friday

13:38Z: Switch off lasers for the weekend. Leave ion in the trap.

uMotions: A: 7%, B: 3%, C: 4%

12:13Z: Switch lasers on. Ion still in the trap!

2021-05-20 Thursday

PMT off.
15:42Z ion is still stored and cooled. Turn off lasers, leave RF on.


P1092=11mW assumed. Note new C-beam focus seems OK, almost as good as A. Matlab-code fix for C-beam (IR window transmission)

422-beam power before chamber: A 0.65-0.08 = 0.57uW, B 1.15-0.18 uW = 0.97 uW, C 0.9-0.15 = 0.75 uW

RID14790 C-beam detuning scan
RID14787 C-beam fluorescence 10743 / 220 bright/dark (note >2-fold more dark-counts! 422-scatters into PMT!?)

RID14787 B-beam detuning scan, 1000ms gate
RID14785 B-beam 1000ms fluorescence 7785 / 67 bright/dark

RID14783 detuning-scan with A-beam, 1000ms gate
RID14784 A-beam 1000ms fluorescence @ 208 MHz is 9742 / 71 bright/dark (compare to ca 90 counts for the most blue-detuned points in the scan

axial around 1.982 MHz (same as before)


uMotion A 7.5% in 13.8s, B 1.7% in 17.7s, C 4.5% in 13.5 s

last experiments ca 17 local on Wednesday, so ion stored ca 23 hours without cooling
ion appears on camera ca 6-7 seconds after opening the 422-shutter. Detuning 208 MHz as usual
12:55Z turn on lasers
Mid-shield was removed y-day, inner shield is installed

2021-05-19 Wednesday

Set RF back to 10 Vpp and switch off lasers

RF 4 Vpp, Monitors: CH3: 0.720000 V, CH4 1.400000 V :

Photon correlation tickler:
Lower radial 20+12 dB:


Upper radial 20+14 dB:

Axial 20+29 dB:

Coarse:
Axial 0.7637 MHz


Radials 0.34 MHz and ~0.448 MHz (??)


RF 7 Vpp, Monitors: CH3: 1.200000 V, CH4 2.419999 V :
uMotions: A: 10%, B: 2%, C: 5%

Photon correlation tickler:
Lower radial, 20+10 dB:

Upper radial, 20+12 dB:

Axial, 20+25 dB:


Coarse tickler, 0+11 dB:

C-beam:
Radials, 0.6517 MHz, 0.7146 MHz:

Axial: 1.363 MHz



RF 10Vpp, Monitors: CH3: 1.719999 V, CH4 3.479998 V :

Photon correlation ticker:
Lower radial, 20+8 dB:

Upper radial, 20+10 dB:

Axial, 20+23 dB:

Coarse tickler, 0+8 dB:

A-beam:
ID14673 Radials, 0.9529 MHz, 0.99753 MHz:


ID14674 Axial 1.982 MHz


Optimize beams

uMotions: A: 4%, B: 4%, C: 3%

Remove mid-shield and install 2nd RF-monitor probe

10:18Z Switch lasers on. Ion still in the trap!

2021-05-18 Tuesday

14:36Z turn off lasers. leave ion trapped.

Install fixed 20dB attenuator. Axial with 20+23 dB

Try axial mode without fixed attenuator, 0+30 dB dds attenuation.
Too much tickler amplitude.


15:53+03 uMotion 100kphot: A 3.6% in 13.2s, B 2.7% in 20.9s, C 3.9% in 22.2s

14640, 14641, 14642 improve program so beam-letter is included in figure? (include also photons/point?)
Upper radial:

Lower radial: (easier to excite, so peak 2-fold higher with same tickler-attenuation)
height also inversely proportional to FWHM (cooling rate) ?


Upper radial just below 998 kHz (harder to exite wrt. lower radial)
A, 0+23 dB. FWHM is large, so mode aligned along beam??

Lower radial around 952.8 kHz
Correlation with 0+23 dB attenuation
C, 0+23 dB. Peak height 0.6, too high?
B, 0+23 dB.
A, 0+23 dB.

RID14625 photon-correlation tickler, 20+20 dB, A-beam. 20kphotons/pt. inner+mid shield installed. ASI camera
A, 20+20 dB
A, 20+23 dB
B, 20+23 dB, FWHM is almost 2-fold larger than A
C, 20+23 dB,

Switch to ZWO ASI camera

uMotions at new optimum: A: 6%, B: 1%, C: 2%
ID14607: NPL search, [ 0.24512619 26.41013719 50.03631515]

Intensifier powered from Siglent lab-supply; axial:


Ion reappeared!

Ion was lost?
ID14591: NPL search for uMotion minimum. 422 lost lock, fail.

uMotions: A: 8%, B: 20%, C: 22% at [-6, 0.239, 25.919, 51]

06:00Z Ion still in the trap!

2021-05-17 Monday

Tried with another +12V source. Similar result. Investigate intensifier power box?

After removing intensifier power supply:


ID14563: Switch intensifier off:


ID14562: After installing mid-shield, now 0+28 dB:

Install mid-shield.

ID14555: Intensifier on

ID14552: After installing shield, intensifier still off.

Install second half of inner shield.

ID14551: Intensifier off, second peak diminishes slowly?



Switching off intensifier, still two peaks visible? Relaxation time?
ID14543: Removed foil, now two peaks visible for C beam axial:


ID14510-13: Intensifier switched off, lower radial, photon timestamp correlation, 20+11 dB




ID14508: Intensifier: lower radial, photon timestamp correlation, 20+11 dB

ID14507: Intensifier: lower radial, 0+8 dB

Install intensifier and set to max gain.

ID14494: ZWO ASI: lower radial, 0+12 dB


Results below were obtained with ZWO ASI camera

ID14490: Lower radial, C beam, photon correlation, 20+11 dB

ID14489: Upper radial, C beam, photon correlation, 20+11 dB

ID14488: Axial, C beam, photon correlation, 20+25 dB:


ID14487: Axial, C beam, attenuation 0+25 dB. 1.9815 MHz
ID14485: Upper radial, C beam, attenuation 0+8 dB. 0.9972 MHz
ID14484: Lower radial, C beam, attenuation 0+8 dB. 0.95228 MHz
ID14482: Coarse tickler: Radials at approx. 0.95234 MHz and 0.9972 MHz

uMotions at V34diff = 51 V: A: 4%, B: 24%, C: 24%

Sweeping V34diff gives new guess for minimum for A: 51 V.

uMotions: A: 60%, B: 67%, C: 70%

11:20Z Try to load. I = 1.6 A. Ion! at 9min 30s

Check 461 dispenser. Set I from -196.83 mA -197.11 mA

10:49Z Try to load. I = 1.6 A. No ion at 10 min. Flush trap and continue. After 6 min two ions appear. Flush trap and continue. No ion for 10 mins.

Check resonator Z-matching: Minimum 1.01 at 14.4236 MHz. 1.05 at 14.424 MHz. Adjust minimum to 14.424 MHz, now 1.01.

10:29Z No ion in the trap.

2021-05-12 Wednesday

14:13Z turn off lasers

uMotion A 45%, B 41%, C 46%

axial with photon-correlation, B-beam, 20+25 dB attenuation, 10 kphotons/pt.


Upper radial with correlation method. 20+11 dB attenuation, B-beam, 10kphotons/pt


coarse tickler 0+3 dB. half of axial (?) and upper radial


coarse tickler 0+14 dB, lower radial, B-beam

photon-correlation method, 20+11 dB attenuation, B-beam, 10 kphotons/pt - looks ok!?


lower radial with 0+14 dB, ca 950.7 kHz


0+14 dB artiq DDS, scan around upper radial

0+4 dB artq dds tickler shows both of these.
Upper radial scan: peak below 0.99 looks like half the axial mode, around 0.996 is the upper radial

Switch to ASI USB3 camera, to get more magnification

siglent siggen 1.8 Vpp hiZ amplitude for upper radial, manual tickler
upper radial

0.996 and 0.95 MHz radial modes. Upper harder to excite.
Axial mode 0+24/26 dB attenuation

siglent siggen 280mVpp in hiZ mode - for manual tickler
coarse tickler shows resonances at 1.979 and 1.980 MHz

moving camera up/down and l/r increased PMT counts to >200/10ms (from 20/10ms)

12:36Z ion! (tried adjusting 461nm laser-current during loading)
12:14:15Z load with 1.60A
1s camera exposure

detuning to 185 MHz for loading
throw away two ions
align A-beam (not much improvement in fluorescence counts 20-40/10ms)

At 10Vpp see axial mode around 1.980 1.982 MHz

reducing trap drive to 4Vpp shows two ions
detuning to 208 MHz
11:39:15Z (ca 10mins)
11:29Z load with 1.60A (on 6.5 loading took up to 12 mins!?)
Bias voltages from previous settings -6 0.239 25.919 55 V
Detuning 185 MHz for loading
RF on, 10 Vpp drive, Rigol monitor voltage 3.46 Vpp
old camera with intensifier

11:27Z turn on lasers.

Try to record images of secular modes, to see what is causing double-peaked secular resonances?

2021-05-10 Monday

NOTE: results below are due to filter series-resistance together with 10 MOhm input impedance of DMM!

Sanity-check of bias voltages?
V1 on bias-voltage source dispplay: -6.23901 V
V1 from bias-voltage BNC-output (no cable connected): -6.2379x V (last digit x unstable, Keysight 34461A DMM)
V1 from end of pink SMA-cable -6.2380x V (not connected to filter-board)
V1 from green screw-connector (with blue wire to trap conencted): -6.2116x V (voltage is 0.0264 V more compared to unloaded bias source? has this been measured before?)

V2 on bias-source display: -5.76101 V ( 0.5*(V2-V1)=0.239 V is the V12diff programmed - seems OK with V12cm=-6V programmed)
V2 from bias-voltage BNC-output: -5.7601x V V2 from end of pink SMA-cable (not connected to filter-board): -5.7602x V
V2 from green screw connector -5.7356x V (0.0245 V more than from unloaded bias-source)

2021-05-06 Thursday

14:40Z Turn off lasers, leave ion trapped

back to -6V V12cm
Test with V1 and V2 bias-box outputs disconnected and V1/V2 cables terminated with 50R. Still double-peak. Now 10Vpp drive
1.783 and 1.7848 MHz

two axial modes ca 2 kHz apart seen also with siglent generator connected to piece of wire, held in front of the IR-window (IR-side inner shield removed)

Axial secular scanning with Siglent generator (no ext ref). No external attenuator. -12 dBm output (into 50 ohm). Weaker excitation ~1.559 MHz, stronger excitation ~1.5609 MHz.

RID14286 Try correaltion method with more photons 40 kphot/pt. C-beam 20+20 dB att.


8 Vpp C-beam axial, 20+9 dB att, 80 ms gate.
8 Vpp C-beam axial, 20+9 dB att, 40 ms gate. longer gate reduces false peak? measurement is long enough to show 422 power variations
8 Vpp C-beam axial, 20+9 dB att, 20 ms gate
8 Vpp C-beam axial, 20+9 dB att, 10 ms gate
ID14277 try C-beam correlation method, with a lot more attenuation 20+20 dB. 10 kphotons/pt
8 Vpp C-beam axial, 20+20 dB att
8 Vpp C-beam axial, 20+15 dB att

8 Vpp C-beam axial, 20+9 dB att
8 Vpp B-beam axial, 20+9 dB att (B should have more projection onto z?)
8 Vpp A-beam axial, 20+9 dB att
8 Vpp A-beam axial, 20+8 dB att
8 Vpp A-beam axial, 20+7 dB att
uMotion A 3.5%, B 5.7%, C 8.9%
Set RF-drive 8Vpp

9Vpp A-beam axial, 20+7 dB att. NOTE sudden shift down -2kHz(?) when working close to the trap
9Vpp C-beam axial, 20+7 dB att
9Vpp B-beam axial, 20+7 dB att
9Vpp A-beam axial, 20+7 dB att
9Vpp A-beam axial, 20+5 dB att

uMotion A 4.3%, B 4%, C 8.5%
Set RF-drive 9 Vpp

shift of about -0.5 kHz during a few minutes?
A-beam axial, 20+5 dB att
C-beam axial, 20+5 dB att
B-beam axial, 20+5 dB att

Shape of Rb-lock signal changes a lot when moving close to the laser...
Rb-lock unlocked...

Axial ca 1.9745 MHz, 20+4 dB with all beams
axial, 20+4 dB att
uMotion A 6%, B 2.4%, C 6%

Ion seems to be still trapped, fluorescence re-appears a few s after opening 422-shutter
07:23Z turn on lasers.

2021-05-05 Wednesday

Turn off lasers, intensifier. Leave RF on and ion trapped

Double-peak is some nonlinear effect due to too strong tickler??

axial, 20+7 dB att
axial: lower resonance seems weaker, upper is strong with 28 dB att.
axial, 0+28 dB att
axial, 0+25 dB att
upper radial 0+8 dB att
lower radial 0+12 dB att
coarse tickler 0+8 dB shows radials ca 944 and 989 kHz. upper harder to excite.


back to V34dif=55V: get uMotion A 2.6%, B 5.9%, C 7.5%
uMotion A 68%, B 65%, C 60%
All beams illuminate ion ok
detuning to 208 MHz
13:40:30 signal - why 12 min loading-time?
13:28:30Z load with 1.60A
Detuning to 185 MHz
RF on/off to throw away the bright/dark pair

one axial mode maybe 947 kHz
sometimes shifted sideways position when scanning axial tickler
Ion jumping side-to-side seems to indicate one bright ion and one dark ion?
Axial mode ca 1.979 MHz. Coarse tickler with 0+28 dB seems too strong

uMotion A 8%, B 68%, C 44%
A-optimum at V34diff 50V
Trap voltage down to 4Vpp - no clear sign of 2 ions.
uMotion 100kphot: A 66%, B 77%, C 6% (but 11% 2nd harmonic)

A-alignment OK, B some optimization needed, C completely dark - optimization needed
set detuning 208 MHz
12:59 signal! weak cloud (not cooled?) at first - then cold and small image (later this looks like it was one dark and one bright ion)
12:53Z load with 1.60A.
405nm power ca 3.5mW
rf off/on to empty trap

12:47 no signal... check Rb-lock. check 461-dispenser 196.90 mA (close to previous setting)
12:34:30Z load with 1.60A, 1.58W initially. Detuning ca 186 MHz. Yesterday loading time was ca 4 min
Back to voltages -6.0 0.239 25.919 55 V
Install new filter-board - ion was lost during start of removal of old filter-board

---

Set 0 0 33.719 55 V (uMotion A 23%, B 49%, C 34%
11:03Z turn off monitor voltage logging with rigol

At 0 0.239 33.719 55 V get uMotion: A 0.6%, B 4.8%, C 5.5% - seems to confirm 1:1.3 ratio for V12cm:V34cm
Previously 1.3-fold change in V34cm gave micromotion-null. 25.919+1.3*6 = 33.719 V
Down to V12cm=0V in 0.5V steps. This gives uMotion A 70.4%, B 64%, C 67%
Voltages were -6 0.239 25.919 55 V
Try to lower abs(V12cm) before changing filter-board

Fluorescence appears again some 10s of seconds after re-locking to Rb-line.
Rb-signal changes shape a lot, and is unstable. Now quite a lot of negative DC-offset (previously positive)
10:51 cooling laser Rb-lock unlocked!?
(after lunch)

---

Something in RF-drive/helres not very stable, now axial suddenly higher again, and monitor voltage also higher?
briefly seem to see 1.87 MHz or higher axial, then goes lower to below 1.86 in a few minutes!?

---

Axial mode with correlation method
B-beam 0+30 dB, 20 kphotons/pt
B-beam 0+30 dB, 20 kphotons/pt, wider range 1858-1863 kHz. cooling doesn't work for upper resonance!
B-beam 20+13 dB, 20 kphotons/pt, (added physical attenuator)

---

Check spectrum of tickler-DDS with Siglent SA. Looks OK, no visible sidebands or spurs.
With 18 dB DDS attenuation ca -8 dBm peak with spur-free SNR of ca 80 dB

---

correlation method for upper radial
B-beam 0+20 dB
B-beam 0+18 dB, 935-945 kHz

---

correlation method for lower radial. no physical attenuator. C-beam, 10kphotons/point

20kphotons/pt:
C-beam 20kphotons/pt, 0+16dB attenuation
A-beam 20kphotons/pt, 0+16dB attenuation
B-beam 20kphotons/pt, 0+16dB attenuation. ion not cooled at lower resonance
B-beam 20kphotons/pt, 0+20dB attenuation. ion image/cooling ok through resonance

---

axial secular now around 1.86 MHz (down from 1.886 MHz at end of Tuesday)
Radials ca 892 khz and 940 kHz
Upper radial is harder to excite.
C-beam 0+27dB, 10ms gate
C-beam 0+8dB, 10ms gate
C-beam 0+10dB, 10ms gate

---

Detuning is 208 MHz
Fluorescence counts in 10ms: A 158/4, B 111/4, C 129/6
uMotion 100kphotons: A 5% in 9.3s, B 3% in 12.3s, C 4.5% in 10.5s

07:15Z lasers on, ion seems to be still stored. camera image maybe a bit defocused?
This is maybe the 2nd (?) time ion has been stored without cooling over night?
sometime during the night, monitor-voltage dropped from 3.36Vpp to 3.2Vpp (rigol scope)

2021-05-04 Tuesday

14:30Z turn off lasers. leave rf on and ion trapped

B-beam counts 66/0.22 in 10ms
B-beam power ca 0.6 uW
C-beam 0+28dB, 100ms gate
C-beam 0+30dB, 100ms gate
B-beam 0+28dB, 100ms gate
C-beam power ca 0.6 uW
C-beam ca 70/1.5 in 10ms
misalign 422 fiber-coupling (laser breadboard)

C-beam power ca 1.3 uW (too much?). Fluorescence counts in 10ms is 137/7
uMotion 100kphot: A 1.9%, B 4.6%, C 6.2%
Back to 208 MHz
0+26dB, 100ms gate
0+26dB, 100ms gate

Try detuning 185 MHz
0+26dB, 50ms gate
0+26dB, 100ms gate (note different rage)

Try changing V12cm +0.2V to -6.0, and V34cm +1.3*0.2V to 25.919V - should change axial/radial ratio?
0+8
0+10 dB
axial 0+24 dB
axial 0+27 dB
axial 0+26 dB
axial 0+26 dB (high to low)
axial 0+26 dB (lo to high)

B-beam, sweep over both radial modes
0+10 dB
0+8 dB now also upper radial?

Try to measure axial mode around 1.7-1.9 MHz? 0+22dB attenuation

(sweep now from high to low)
(sweep now from high to low)
(low to high)
ca 1893 and 1895 kHz.
radials were 898 and 899 kHz

A-beam, 0+10dB attenuation 0.9-1 MHz, 2000 pts, 10ms gate (down from 100ms previously). check how repeatable results are?
ID13969, ID13970



Zoom in on 0.88-0.92 MHz and repeat: now 0+8 dB attenuation


0+10 dB
0+12 dB
0+12 dB

peaks seem to move around a lot?? changing Rf-amplitude?
further coarse-tickler scanning 0+8 dB shows peaks: ca 862 kHz, 867 kHz, and 944 kHz !?

ID13938: Maybe two peaks? Too much power?
Attempt to measure with photon correlation.

ID13933: Two-peaked lower radial now with 13 dB instead of 3 dB!
Disconnected new tickler coupling (to lower electrode). Attached old coupling capacitor to upper electrode terminal.

ID13912 photon-correlation tickler 933-935 kHz, 0+29dB att, 100pts, B-beam 10 kphot/point

ID19311: Radial (lower) sweep (coarse): 0.93236 and 0.93372 MHz
ID13903: Axial secular sweep (coarse): 1.9632 and 1.96496 MHz
ID13902: Radial (upper) secular sweep (coarse): 0.978 and 0.980 MHz

setting V34diff to 55V gives A 2%, B 5%, C 2.5%
lowering V34diff to 56V gives A 18%, B 22%, C 21%

uMotion 100kphot A 39.9%, B 42%, C 42% (1st harmonic looks ok, with only little 2nd harmonic)
set detuning to 208 MHz - image now much brighter
10:32:10 signal!
10:28Z load with 1.60A. 1.56W initially, ca 1.60W after 1 min, 1.607W at 2 min,
set detuning 185 MHz

no cooling during lunch -> ions seem to have disappeared?
when lowering trap-drive from 10Vpp down the glitch is between 3.6->3.5 Vpp
two ions visible when lowering trap-drive to 4 Vpp. blink-test with 405nm confirms this
uMotion A 15%, B 3%, C 3% (but 11% 2nd harmonic?)
set detuning 208 MHz
08:50 ion signal!
08:43 load again with 1.60A. Now with better 461nm current value
08:41 signal - blinking? looks like many ions, so throw away
08:27 load with 1.60 A dispenser, 461 current driver at too high set-point. Set I=-197.0mA at 10 min.
08:15Z turn on lasers

2021-05-03 Monday

no time for trapping today, turn off lasers
no sign of ion...
08:15Z turn on lasers, check if ion is still stored?

2021-04-30

Turn off lasers. leave RF on and dark ion trapped (until Monday?)

422 power check after detuning scans (compare to before values below): A 1.0 uW, B 1.6 uW, C 1.3 uW
Detuning-scans with improved beam alignment now looks better:
ID13862, A-beam, 1s gate. Fluorescence at 208MHz in 1s gate: 13462 / 64. scan is -23 MHz to +12 MHz from nominal detuning in 60 steps
ID13865 B-beam 1s gate. Fluorescence(208MHz, 1s): 12106 / 55
ID13868 C-beam (new!) 1s gate. Fluorescence(208MHz, 1s): 10208 / 386 (compare the dark backround count to blue-detuned values in the scan?)

uMotion now A 9%, B 3.6%, C 3.9%
aligning ASE-beam improves counts from 50/10ms up to >200counts/10ms - a 4-fold improvement.
422 beam power check: A 0.7 uW, B 1.3 uW, C 1.3 uW - similar as before.

uMotion check: A 4.9%, B 3.2%, C 3.2% - these look OK, but why are detuning-curves so bad??
Typical detuning curve:


wide scan with 0+6 dB:

With 0+6 dB attenuation also a double-peak around 933 kHz!??

Stronger tickler possibly reveals lower radial mode around 933 kHz
radial sweep, 0+17 dB attenuation. 978.3 kHz peak, 980 kHz peak (half of axial?)

tickler-spectrum with 0+28 dB attenuation:


ID13810 detuning-scan C-beam, 100ms gate. Fluorescence at 208 MHz in 100ms is 326.53/14.98 (note almost 2-fold more dark-counts with C-beam, 422-beam scatters more into camera/PMT?)
ID13807 detuning-scan B-beam, 100ms gate. Fluorescence at 208 MHz in 100ms is 285.1/6.46
ID13803 detuning-scan A-beam, 100ms gate, -23 and +12 MHz from 208 MHz. Fluorescence at 208MHz in 100ms is 355.6/7.9

Fluorescence levels (10ms) are A 35.6/0.86, B 27.8/0.72, C 35/1.24
Algorithm suggests 0.239 25.659 57.290 where we get: (100kphot) A 6.4% in 31s, B 0.6% in 36s, C 1.7% in 32s
ID13788 uMotion minimization 2x2x2 grid.
(Note NPL minimization program previously had wrong V12cm=-5V setting, now set to -6.2V as used while manually scanning)

(Note V12cm = -6.2 V is held constant) Based on this 0.202 25.5 57.5 should be A+B optimal? Get A 11%, B 2%, C 8% ( by luck? we found also a C-optimal point!?)
V34cm 26V: A-opt (26, 57), B-opt (26, 58)
V34cm 27V: A-opt (27,56) and B-opt (27, 59)
Try same scans at V34cm=28V: B-opt (28, 60), A-opt (28, 54)
further scanning shows B-optimal point ca (V34cm, V34diff) = (29.301, 61) V . should now change something so A-optimum at (29.301, 52.5) coincides?
now A 1.7%, B 82%, C 76% at voltages 0.202 29.301 52.5
scanning V34 diff shows A-minimum at 52.5V

at this point uMotion A 48%, B 74%, C 68%
optimum found 0.202 29.301 55.057
ID13755 uMotion scan 4x4x4 grid, 50 kphot/point, estimate duration 50min (lunch)

uMotion A 8%, B 70%, C 72%
scanning V34diff shows A-min at 61V
uMotion A 64%, B 81%, C 77% (2nd harmonic content lower)
08:37:20 ion signal!
08:28 try to load with 1.60A dispenser current. Rb-lock of cooling laser seems a bit jumpy, very sensitive to air-currents above laser (shield this with alu-plate or plexi?)
trap RF OFF and the ON, to empty trap
Ions seem to be lost
08:10Z turn on lasers.
two ions were left in the trap yesterday, lasers turned off.

2021-04-29

Blink test doesn't look great. two or more ions


Suggested optimum 0.199 23.38 65.08 - here get A 23% B 22% C 27%
ID13727 try uMotion scan 3x3x3 grid with 10kphot/point
Try detuning 208 MHz as usual?

suggested optimum 0.253 26.89 59.51. At this point A 33%, B 23%, C 21% (all with a lot of 2nd harmonic) - make sure we have only one ion!?
ID13719 try uMotion minimization with 2x2x2 grid, 50 kphot, ranges [0.2, 0.25], [26, 27], [58, 59]

Now uMotion 100kphot A 5.5%, B 36%, C 29%
Try scanning V34diff with A-beam: A-contrast minimum at ca 58.4 V
based on bias-voltage program we are now at -6.2 0.239 26.3 62.4 V
uMotion A 55% B 19% C 21% - but large 2nd-harmonic correlation, so bias voltages require adjustment
Note detuning now ca 190 MHz (because cooling didn't work previously with 208 MHz)
Install IR-side inner shield. C-beam passes through the shield hole OKish
C-beam gives ca 50 counts/10ms (maybe focus is a bit off)
Install new C-beam. Requires 0.5" extension lens-tube, so that fiber-connector doesn't interfere with Polaris M4 mounting screws

NOTE: 1.958/2 = 0.979 - so one peak in the radial spectrum might be half the axial mode?
With 0+26 dB attenuation axial mode around 1.958 MHz

Tickler with 0+13 dB attenuation shows two peaks at 0.978 and 0.979 MHz (don't know if this is the higher or lower radial mode)


uMotion A 17%, B 15%
mostly side-to-side adjustment of B-beam gives 70 counts/10ms for B also.
ca 70 counts/10ms from A-beam, very little from B-beam
detuning to 208 MHz, ionization lasers off.
CMI FLIR IR-camera monitors dispenser, and window/chamber black tape reference areas
11:00Z: Try to load, 1.7 A, Ion! after 7 min.

10:48Z: Try to load, 1.6 A. No ion after 10 min.

7:38 UTC: start working in the lab.

2021-04-27

Check 461 dispenser: -196.95 mA, 4.462 kOhm.+

2021-04-08

turn off lasers - not sure why loading didn't work?? :(
12:31Z no signal... dispenser off
no signal in 8-9 min, try lowering RF-drive to 4.0 Vpp (same as earlier today when loading)
12:07Z load with 1.60A dispenser (1.54W initially... rising to 1.604W)
empty trap by turning RF off, and then back on
set detuning to 185 MHz

seems ion was lost. not sure why - higher RF-voltage might give unstable trapping parameters?

---

ion went dark!?
Upper radial see two peaks with 0+15 dB: 1.45822 and 1.458975 MHz

Upper radial seems easier to excite?
Matlab secular predicition: 1.436, 1.469 3.06 MHz
Monitors now 5.2 and 2.16 Vpp
Set Keysight to 4.8 Vpp - 20% higher than before

---

Monitors 4.4 Vpp and 1.76-1.8 Vpp
lower radial 1.179495 MHz with 0+2dB
lower radial ca 1.18 MHz. Found with 0+2dB attenuation.
radial 0+10dB, 1.218889 MHz
axial again 2.490206 MHz, 20+9 dB attenuation

axial at 2.4894 MHz, 0+24 dB attenuation

with 0+6dB get asymmetric peak (too much heating)
Coarse tickler 0+10dB att finds one peak at 1.2184 MHz

Lunch-break...

Counts at 208 MHz are 43.8/1.3 in 10ms
Also try this with the lights off in the prep-room: (3-4/10ms lower background in 10ms, so 30-40 lower in 100ms?)

Repeated detuning scan with A-beam


optimizing PMT/pinhole-position gives slightly better counts 50/10ms
at -6.2 0.239 26.3 62.4 detuning-scan with A-beam shows a better slope over the detuning-range
Counts still quite low 40/5 in 10ms
(detuning scan with 100ms gate)


V34d 62.4V slightly better giving A 1.7%
at -6.2 0.239 26.3 63V get uMotion A 11% and B 31%
Further scanning V34diff shows A-minimum around V43dif=63V
NOTE: IR-side inner shield not present. Imaging this side with the FLIR camera

A-beam PMT counts 42/6 in 10ms (lights on in the prep-room give higher dark-counts)

B-beam detuning scan.


A-beam detuning scan. For secular correlation we want a large slope at 208 MHz detuning - not so great here..
Scan range (from 208MHz) is -23 MHz to +12 MHz


leave at V34diff=45V. uMotion A 50%, B 49%
Try V34diff 44..48V - no clear minimum. Try V34diff 48..52V - optimum might be at a lower voltage
Try sweeping V34diff 52...56 V and search for B-minimum? no clear minimum
uMotion 100kphot: A 83% in 28s, B 82% in 36s
PMT counts B-beam 34.5/1.5 in 10ms (similar to A, so maybe this is due to micromotion)
PMT counts with A-beam are 39.9/1.8 in 10ms - seems a little low (micromotion, or alignment?)
Set detuning to 208 MHz - giving much brighter image

Both A and B beams give fluorescence - so their alignment is ok
dispenser off, photoionization off.
07:50:40 signal!
07:45 try to load with 1.60A (1.54W initially)

intensifier + PCO camera (200 ms exposure)in use. Objective attached and camera focus to "7" on the micrometer-translator. Field of view should be large, almost see top/bottom inner electrodes in image
Latest bias voltages in ARTIQ are -6.2, 0.239, 26.3, 54 V (these probably in use now). Actual voltages on device screen -6.439 -5.961 -27.7 +80.3 V
RF on at 4.0 Vpp, giving monitors 4.4 Vpp and 1.8 Vpp with Rigol scope
Cooling laser on. Rb-signal seems to wander a lot? Optimize AOM-angle for 185 MHz detuning

2021-04-07

Keysight siggen glitches: 4.0->4.1 Vpp when moving up, 3.6-3.5 Vpp when moving down

2021-04-01 Thursday

Setting RF to max (and testing) at 11:03 UTC

Setting RF drive to nominal 2.9 Vpp at 10:36 UTC with amplifier
Setting RF drive to nominal 10 Vpp at 10:30 UTC without amplifier

Adjusted impedance matching of resonator. Now optimal SWR = 1.01 at 14.424 MHz

Setting RF drive to nominal 10 Vpp at 10:14 UTC without amplifier

Setting RF drive to nominal 2.9 Vpp at 09:26 UTC with amplifier

Using trap drive of 1.5 Vpp:

ID13539: axial: B-beam: 28.5 dB, peaks at 0.8874 and 0.89087


ID13553: radial: B-beam: 0+2.5 dB, peaks at 0.39152 and 0.388136


ID13522: radial: B-beam: 0+1 dB, peaks at 0.4431156 and 0.445226


ID13516: radial: B-beam: 0+15 dB, peak at 0.48653



Using trap drive of 2.5 Vpp:
ID13506: axial: B-beam: 0+28.5 dB, peaks at 1.4898 and 1.4922


ID13494: radial: B-beam: 0+13 dB, peaks at 0.764045 and 0.766067


ID13490: radial: B-beam, 0+2.5 dB, peaks at 0.744638 and 0.745797


ID13479: radial: B-beam, 0+3 dB, peaks at: 0.7044925 and 0.70652.


Three peaks ??? :

2021-03-31 Wednesday

Leave cooling laser and ASEs on for the night. Switch off intensifier and PMT.

Switched back to 208 MHz detuning

Bias voltages: [-6.2, 0.239, 26.3, 54]

ID13382: B-beam detuning scan


Secular: correlation method with 20 dB attenuator:
ID13446: Axial 20+17 dB attenuation: split into 2 peaks approx. 2 kHz apart!


Seculars: old method: no additional attenuation:
ID13454: axial: B-beam, 0+27 dB, with 185 MHz detuning.


ID13445: axial: B-beam, 0+28 dB, peak at 1.737692


ID13423: lower radial, B-beam 0+3 dB att. peaks at 0.826577 and 0.8282684


ID13360: upper radial, B-beam, 0+13dB att. 0.8785 MHz

ID13380: Radial scan, peaks at 0.877826 and 0.880029


V34diff: 54 V, V34common: 26.3: A: 2%, B: 2%

55.6 V V34diff: A: 70%, B: 1%

ID13332: Trying lower radial with B :

Set voltages to: -6.2, 0.239, 28.0873, 52

49 V V34diff: A: 54%, B: 81%
Search for rough umotion minimum: 52V V34diff: A: 8%, B: 67%

Install inner shield ASE side (both parts of inner B shield now installed).

Ion from Monday still in the trap!

RF drive is now 2.9 Vpp, with RF amp and 35 dB input attenuation.
Switch to Rigol scope for RF monitoring.

2021-03-29 Monday

ID13299: Trying lower radial with B :

ID13298: Trying axial with B, two peaks? :

A 63%, B 3% at V34diff = 69 V

A 4%, B 62% at V34diff = 65 V

A 32%, B 42 % (no C-beam installed)
maybe we have too much micromotion?
axial secular seems to drift higher as measurement proceeds?
12:58Z ID13266 correlation-measurement of axial, 1.724 - 1.73 MHz, 20 + 17 dB attenuation

maybe around 1.727 MHz - not so great shaped resonance..
coarse tickler 0+20 dB att axial 1.8-2.0 MHz -> somewhere in 1.72-1.74 MHz range
upper radial ca 885.4 kHz, 0+10 dB tickler att.
coarse tickler shows lower secular 833.4 kHz.

A-beam gives ca 100counts/10ms
blink-test with 405nm (low power) seems to show only one ion.
disconnect 422nm fiber to use it for aligning the PMT-splitter. Fiber-end at PMT-position, watch for centered 422-spot with the IR-side camera
Currently no PMT-splitter installed...
coarse tickler-sweep 800 kHz - 1 MHz seems to show two resonances - OK
found A-beam alignment also (at first only B-beam gave fluorescence)
12:03 signal! from B-beam? dispenser off
11:58:30 load with Dispenser 1.7A
RF signal-gen 2.9Vpp, monitors 3.12 Vpp and 1.33 Vpp

A-beam power:
461nm 132uW
422nm A 0.7 uW, B 1.0 uW
405nm 3.5 mW
repumper 11.4 mW
clearout 62 uW

Check 461 dispenser: -197.13 mA, R 4.462

align intensifier + pco camera to inner electrodes
connect 2nd monitor to scope. monitors 4.11 and 1.68 Vpp
remove IR-side inner shield
remove outer shield, remove mid-shield
08:13Z lights on in the lab, remove finnfoam-boards
(note summer time now, UTC+3)

2021-03-26 Friday

13:36Z dispenser off - could not get any cloud or signal visible??
12:59Z dispenser 1.66A
lab dark, intensifier to 5V, ca 400-800 ms exposure on PCO camera
422nm detuning 185 MHz
RF generator 2.8 Vpp (+attenuation + RF PA), monitor 3.1Vpp and 1.25 Vpp
re-align camera+intensifier to electrodes
Try to trap!?

2021-03-25 Thursday

17:04Z: Install all shields, and leave RF on (will switch off after midnight). RF drive voltage: 4.0 Vpp.


14:16Z Try to load, 1.65 A

13:41Z Adjust ASE,try to load, 1.65 A (1.66W).

13:14Z Adjust A-beam, try to load, 1.65 A (1.66 W). No ion.

12:49Z Adjust A-beam, try to load, 1.65 A (1.66 W). No ion.

12:10Z Adjust A-beam, try to load, 1.65 A (1.66 W). No ion.

12:01Z: Try to load, 1.65 A (1.66 W). No ion.

11:48Z: Try to load, 1.65 A (1.66 W). No ion after 10 min.
Install intensifier and ethernet camera.

10:41:30Z: Try to load, 1.65 A (1.66 W). No ion after 10 min.

10:20Z: Try to load, 1.6 A (1.56 W), RF drive 3.9 Vpp, CH4 monitor 3.02 Vpp. No ion after 10 min.

Check power: 422 A: 1.1 uW B: 1.5 uW , 461: 144 uW , 1033: 55 uW, 1092: 10 mW

Check 461 nm dispenser: T = 4.642 kOhm, I = -197.27 mA

Added 3 dB attenuation. Now 'normal' drive voltage is 3.9 Vpp (CH4 monitor 3.02 Vpp), and high is 8.9 Vpp (CH4 monitor 6.77 Vpp). Voltage can be adjusted now between normal and high without glitching.

RF generator glitches when moving from high voltage (6.4 Vpp) to 'normal' voltage (3.2 Vpp)

Logging monitor-voltages from scope failed during the night

2021-03-24 Wednesday

Resonator connection, filter board and Cu tube shield had to be removed to put thermal paste between alumina insulator and shapal heat sink.
Significant drop in monitor voltage after re-assembly was due to resonator helix being off center, towards the trap. After centering (tuner end opened), resonance frequency was <14.414 MHz.
After tuning, min SWR 1.01 @ 14.424 MHz, R 50.6 Ohm, X -0.24 Ohm. Q visually as before.
Monitor voltages even higher than before. Note: old monitor very sensitive to helix position, new monitor reflects real trap voltage better?

2021-03-23 Tuesday

12:42Z set to 6.4 Vpp, which gives roughly doubled monitor voltages compared to previous night
12:37Z With 6Vpp drive get monitors of 5.71 Vpp and 2.6 Vpp
12:33Z RF PA on and connected to helres with 3Vpp drive from siggen CH1

Test the RF PA. Attenuation from siggen to PA-input: 35 dB
Previously 70 mVpp (-19 dBm) from siggen gave ca 1 and 2 MHz seculars.
With 10Vpp (+24dBm) an attenuation of -35 dB gives -11 dBm (ca 178 mVpp) - OK max voltage at PA input?
siggen 3.1Vpp, 35 dB attenuation, and RF PA seems to give similar monitor-voltages as before 2.93 Vpp and 1.33 Vpp

2021-03-22 Monday

Temperature rise with shapal heatsink and new Cu-tube.
RF 10Vpp from signal-generator, giving ca 3 Vpp on helres monitor. Seculars not measured since last helres/cu-tube changes, probably ca 0.9/1.8 MHz as usual


Trap efficiency was now estimated from a 3D FEM simulation (KH 2021-02/03), giving:

eta_in,z = 0.7264
eta_in_r = 0.7263
eta_out,z = 0.6978
eta_out_r = 0.6976

This can be compared to the old 2D cylindrically symmetric FEM result (AW 23.6.2019 and 9.11.2019, TLi notes 13.11.2019):

eta_in = 0.75
eta_out = 0.67

2021-03-18 Thursday

Installed shapal-rod heatsink, new D42mm Cu-tube, new U-shaped filter-board (with MMCX-connector for tickler)
Black tape on RF-parts for IR imaging

measured with DMM: V1 = bottom outer electrode = -5.215 V
V2 = top outer electrode = -4.739 V
ARTIQ settings are V12cm = -5V, V12diff = 0.239 V (?check if these are the ones last used?).

2021-03-08 Wednesday

Restarting clock laser to try new comb rep-rate piezo.
PDH settings were lost. These seem to work: Freq 25 MHz, amplitude 1.8 dBm, phase 51.4deg, lock level 0.0. (ARC gain notes 2020-11-21)
Composite-VGA converter for cavity camera is fried. Camera works ok with portable mini-screen.

New 1-channel Thorlabs piezo drive for Menlo comb rep-rate lock. Seems to work (check beat-note noise and compare to old data?)

2021-03-08 Monday

buy more tape for label-maker: Dymo D1 (12mm, 0.5")

14:45Z Open cavity doors
Arrange cavity-rack in preparation for moving clock-laser seed there

2021-03-05 Friday

shut down lasers
ion seems lost, storage time ca 11 days
stop 405nm after 10 min - still no ion
Re-lock to Rb-line, seems ok
Try all beams on and 405 nm on, repumper + clearout on
07:58Z stop B-count program.
ion went dark at some point, 04:36 local?

2021-03-04 Thursday

17:07 start B-count logging (with B-beam)
Datafile: 2021-03-04-counts


Abort A-count logging at 17:03 local.

Results from A beam fluorescence count monitoring:

Counts and ambient temperature (110 PT100):

Correlation (XY-plot) of counts and temperature:

2021-03-03 Wednesday

Leave A-beam fluorescence monitor over night. start ca 15:47Z
gate 1000 ms. Should run for 24 hours.
Datafile: 2021-03-03-counts2. Note 1000ms gate-time is accurate, but there is dead-time between each data point.

---

09:30Z people in the lab again, may cause temperature-oscillation?

Could be related to 422nm polarization issues also?
C-beam counts, hands-off before t=300

B-beam counts when heating the fiber. Hands-off a bit before t=200. Towards end camera-image is quite weak also

A-beam counts when slightly heating the 422laser -> ion-breadboard fiber. A-beam has polarizer, which converts polarization-rotation to power fluctuations(?)

Seems low, did voltage-changes move ion out of beam-center?
Fluorescence in 10ms: A 53.76/1.82, B 22.64/1.33, C 61.05/1.95

Try again: A 12%, B 2.9%, C 2.9%
At this point uMotion: A 42%, B 49%, C 48% - user ERROR, wrong voltages applied
Optimal voltages (Common mode, diff): [ 0.23901015 28.08731594 48.19857708], V12cm = -5 V
ID13189 uMotion scan 2x2x2
uMotion A 23%, B 29%, C 32%
Voltages now at -5 0.2347 28 50.051

ID13185 z with A-beam
ID13184 z with C-beam
ID13183 rhi with A-beam - broad resonance
ID13182 rhi with C-beam
ID13181 rlo with A-beam
ID13180 rlo with C-beam

A-beam seculars
z lorentzian fit may not be very good?

C-beam seculars

B-beam seculars:

ID13179 rlo scan 935-939 kHz
ID13178 rhi scan 980-984 kHz
ID13177 B-beam z-scan with 20dB, fit finally works. peak height ca 40%
B-beam tickler z-secular with 17 dB gives 60% high peak - and fit fails - maybe more attenuation needed
lorentzian fit to z-secular with A-beam seems difficult..
ID13172 try z-secular with A beam again, 27 dB attenuation - but fit fails again.
ion still stored

2021-03-02 Tuesday

No experiments during the night
Leave B-beam on.

---

Summary: Seculars with -5 0.2347 28 50.051. A-beam
axial/radial ratios ??

z-scans where lorentzian fit failed:
Note these are also asymmetric/hysteretic. we sweep the tickler from low to high frequencies

---

ID13170 try again with 23 dB DDS attenuation (up from 17 dB) - fit fails for the 3rd time
ID13169 narrower range 1843-1844.5 kHz - too strong tickler gives blurry image? may not give lorentzian resonance? - fit fails again!??
ID13168 fit fails :(
ID13168 z scan 1842-1846 kHz - peak up to 50% with blurry camera image. As predicted A cools z-secular badly, so resonance is narrow
z search 1840-1860 kHz - found at 1844!
old z(-6.1)=1876 kHz and z(-6.2)=1879 kHz, so expect z(-5) at -33kHz around 1843?

ID13166 rhi scan 980-984 kHz - as before, rhi resonance is broad with A-beam
rhi search 970-990 kHz - found around 982 kHz
previous rhi was 954 kHz, so expect it around 985 kHz maybe?

ID13164 rlo scan 935-939 kHz
930-940 kHz - peak at ca 936.5 kHz - ca +31.5 kHz from last value with V12cm=-6.1V
search 920-930 kHz - no peak
search 910-920 kHz - no peak
tickler search 900-910 kHz (previous rlo was 905 kHz) - no peak found. 0.1V change in V12cm moved r-secular 3 kHz yesterday, so expect 30-33 kHz now?
Using A-beam for these tickler measurements

Go back to -5 0.2347 28 50.051 - uMotions A 2%, B 9.9%, C 13%
At this point: A 46% !!, B 2.3%, C 16% - repeat A 46%
Optimal voltages (Common mode, diff): [ 0.19201393 27.06730014 49.21492668]
ID13146 uMotion scan 2x2x2 grid
at -5 0.2347 28 50.051 get uMotion A 2.8%, B 11.5%, C 12%
Try scanning V34cm, A-minimum at 28 V
Now uMotion A 38%, B 27%, C 31%
Try reducing V12cm to -5 V. Other voltages as before 0.2347 26.7769 50.051

---

ID13112 uMotion scan with 5x5x5 grid
Optimal voltages (Common mode, diff): [ 0.23465246 26.7769039 50.05097994], V12cm=-6.1 V
At this point A 2.9% in 16.3s, B 2.2% in 13.4s, C 2.6% in 21.9s

ID13106 uMotion scan 2x2x2
scan gives Optimal voltages (Common mode, diff): [ 0.18054628 26.89479311 50.30482989]
At this point get A 3.9% in 20.5s, B 12% in 16s, C 4.4% in 19.8s

at -6.1 0.2277 26.3891 51.2 get uMotion: A 6.7%, B 22%, C 25%
Sweep V34 diff: A-min at 51.2 V
uMotion (100kphot): A 70%, B 71%, C 72%
Fluorescence (10ms): A 74.27/1.48, B 114.38/1.34, C 66.76/1.98 (lab lights are off)

after ca. 1 min of 405nm irradiation - ion re-appears!?
re-lock to Rb-line
08:54Z ion seems dark
After a stable period, lab temperature oscillates again?? why?

2021-03-01 Monday

16:52 leave lab.
Leave A beam on. No experiments during the night

Maybe Rb-lock was OK?
Now A 97.6/2.13, B 38.85/1.62, C 74.11/1.93
Try re-locking to Rb-line
repeat A 93/1.9, B 98/1.47, C 72/1.66
Fluorescence (10ms): A 86/1.6, B 90.67/1.43, C 64.57/1.61

---

What if we try to minimize micromotion at V12cm = -6.1 V? Previosly V34cm change was -1.3 V34cm/V12cm
ID13058 uMotion scan 2x2x2 grid
B gives really low fluorescence suddenly? 50 seconds to measure 50 kphotons
Optimal voltages (Common mode, diff): [ 0.22771198 26.38907221 56.11298177] (note previous V34cm was 26.18V so this is now higher?)
At this point get 100kphot uMotion A 7%, B 2.1%, C 1% (ca 21-22s measurement time with A and C, but with B 102s)
Tickler measurements now with A-beam
ID13064 z-scan, with -6.2V was at 1876.4 kHz (B-beam in use, tickler program sets beam!?)
A-beam fluorescence also quite weak, laser Rb-lock possibly jumped? (to next Rb-line +60 MHz more detuned?)
Previous peak-height was just over 30%, now get 60% because of less efficient cooling/damping?
ID13065 rhi scan 952-956 kHz - previously at 953.9 kHz. Now with A-beam, giving very broad resonance (A cools rhi well?)
ID13066 rlo scan 903-907 kHz - previously at 905.1 kHz. Note FWHM is almost 3-fold narrower

---

ID13053 better z-scan
z scan 1870-1880 kHz - found just above 1876 kHz rhi scan 951-961 kHz - found at 954 kHz
rlo shifted up by +3 kHz, around 905 kHz
ID13047 900-904 kHz rlo scan
Try V12cm = -6.1 V (no change in other voltages)
uMotion A 8.6%, B 19%, C 21%
Tickler measurements with B-beam
axial/radial ratios 1.967 and 2.073

---

axial/radial ratios 1.976 abd 2.083
with V12cm = -6.2 V , seculars today are:

ID13045 rlo scan
ID13044 search for rlo 897-907 kHz - 1% higher than Friday would be 902.8 kHz - found at just over 902 kHz
ID13043 scan 949-953 kHz
ID13041 rhi search 940-950 kHz. same scaling would give 946.7 kHz - found peak at 951 kHz
ID13040 1876-1882 scan.
ca 0.55% higher than on Friday
ID13039 search 1870-1880 kHz. 10 kHz/30 pts = 333 Hz step - peak around 1879
Search for z-secular 1860-1870 kHz

at this point A 4.0%, B 2.2%, C 1.2%
Optimal voltages (Common mode, diff): [ 0.23807795 26.17776091 57.07942005], V12cm = -6.2
ID13032 uMotion search 2x2x2 grid

ca 57V seems better, uMotion A 13%, B 40%, C 43%
previous V34diff was 49.8V
uMotion A 75%, B 74%, C 72%
Fluorescence A 122.37/1.85, B 119.98/1.83, C 82.64/1.95
install inner shield camera side, and mid shield

With old objective, when focused to Z=7mm, gap to vacuum window is ca 5mm
However image with new objective not so great :( so go back to old objective
Try new objective: focus is closer to Z=6mm, and new image ca half screen to the right of old objective (as viewed in ASI camera software)
For old imaging objective XYZ Z=7mm translator X=55, Y= 36<->0
got C-beam aligned, via electrode diffraction pattern (only inner shield installed)
remove mid-shield
aligning C-beam with mid-shield installed seems difficult
ca 12-12:30Z (14 local) work in the lab (check how temperature responds?)
Ion stored for ca 1 week now
07:13:00Z Stop collision monitor.

2021-02-26 Friday

16:03Z start collision monitor. B-beam, detuning 208 MHz, fast 3 ms gate. Threshold set as 40 bright 1 dark (artiq sets geometric mean of these?)
clearout is on
NOTE: scripts assume 10ms gate time, use last column (machine unit) for analysis
states
dark_durations
bright_durations


B fluorescence in 10ms: 157/1.14, in 5 ms: 71.97/0.44, in 3 ms 44.27/0.42 - lab lights are off
Set RF drive to 10 Vpp
uMotion A 2.8%, B 2.6%

---

Summary of secular results (Compare to 2020-12-09)
Z-frequency 94.95% of Dec value, with voltage-slope 93.09% of Dec value
rhi 95.55% of Dec value, with voltage-slope 93.37% of Dec value
rlo 95.05% of Dec value, with voltage-slope 93.90% of Dec value

---

Set RF drive to 9.0 VPP.
z maybe 1681 kHz? found at 1675 kHz
rhi maybe 836 kHz? found at 852 kHz
rlo maybe 800 kHz?

---

Set RF drive to 9.5 VPP. Expect 95% of 10Vpp seculars?
z ca 1775 kHz? actual resonance ca 1771 (94.8%)
rhi maybe 888 kHz? found at 897 kHz
rlo maybe 843 kHz? found at 847 kHz

---

lower radial slightly lower than expected, below 894 kHz
Try to find r_hi 934-940 kHz
Behold, artiq autogenerated figure output from the correlation tickler secular sweep program
(these measured with the usual 10Vpp RF drive, B-beam, fixed 20 dB physical atteunator on dds-output, software attenuation adds to this)

---

ID12911 same scan, modify lorentzian fit to match matlab 'lorentzfit' functional form. resonance at 1868.59
try 1866-1870 kHz - 22% peak at 1868.6 kHz
ID12909 secular z-sweep, B-beam, 1862-1866 kHz
RF monitor 3.06 Vpp

uMotion A 1.8%, B 3.4% (C not aligned to ion...)
Set -6.2 0.2445 26.9255 49.8
scan V34diff, A-optimum at 49.8V
uMotion: A 37%, B 28%
C-beam alginment seems lost...
Fluorescence countsin 10ms are: A 97.8/1, B 106.4/1, C 42.2/1.5 (lab lights are off)
Detuning back to 208 MHz

11:59 stop collision monitor
11:58Z ion still stored. fluorescence quite weak

2021-02-25 Thursday

lights off, leave lab.
16:49Z start collision-monitor ID12879, DB 2021-02-25-run1
B beam, Counts / 10 ms: Bright: 35, dark: 3.
Detuning 190 MHz. Clearout on
states
dark_durations
bright_durations

---

Set detuning to 190 MHz, giving ca 30-40 counts in 10ms
Use B-beam (may have polarization issues? correlates with lab-temperature?)

uMotion A 4.8%, B 5%, C 2.8%
Set voltages -6.2 0.2445 26.9255 51.6
Scan V34diff, A-minimum at 51.6V
uMotion A 12%, B 11%, C 11%
Counts A 141/4, B 62/3, C 103/4

Try I1 = -8.6056, I2 = -1.0049, I3 = 7.0059, giving abs(B) =
ID12845 peak search with 300us
C1+ 18%, C1- 32%
C1 B estimate = 2.055935940628926
C1 Linecenter = 75.97028908312774

NOTE: B-beam fluorescence down to 53.57/3.17, indicating maybe Rb-unlock? (or polarization-effect giving unbalanced C+ and C- peaks?)

Try I1 = -8.6056, I2 = -3.0049, I3 = 7.0059, giving abs(B) = 2.2646, 2.2526, and uT
ID12842 peak search, 300us. Should now compute line-center and B after each pair
C1+ 24%, C1- 64% (!)
C1 Linecenter = 75.97024614563541
C1 B estimate = 2.2646399566052304 uT
C2+ 24%, C2- 14%
C2 Linecenter = 75.97025830181504
C2 B estimate = 2.2525933966917435

ID12840 peak-search with 300us, and new B-estimate 2.119 uT
C1+ now lower 29%, and C1- higher 53%
C1 Linecenter = 75.97016610304007 MHz
C1 B estimate = 2.1102318715100816 uT
C2+ 45%, C2- 19%

C1 peaks

C2 peaks

C4 peaks

re-initialize search with C1 line-center and B-estimate
ID12838 peak search, 300us probe, with B=2uT estimate
C1 Linecenter = 75.97022862199493 MHz
C1 B estimate = 2.119082202980859 uT

C1 peaks

C2 peaks

C4 peaks

Set coil currents I1 = -8.6056, I2 = -2.0049, I3 = 7.0059

TLi notes on Magnetic Field (2021-02-15)
For B-beam, using A-matrix and B0 residual field from 2021-01-21. 
Should give equal C1/C2/C4
abs(B)  I1      I2      I3
2       -8.6056 -2.0049 7.0059
3       -10.672 -2.5016 9.9934
4       -12.739 -2.9984 12.981

---

ID12835: Peak search without OD filters, B beam. clock_probe = 300 us
C1 Linecenter = 75.97019812711028
C1 B estimate = 1.046407999323715

C1 peaks

C2 peaks

C4 peaks


ID12831: Rabi flopping on B beam, no OD filters. tau_pi ~ 300 us.

---

Problem with comb rep-rate lock
The closed-loop rep-rate error signal started to show glitches, with about 400-500ms period
This caused all SDR counter-data to be flagged invalid
A Thorlabs MDT693 Piezo-driver was tested - and showed no glitches
Also the cable from the rep-rate lock-box to the piezo driver was replaced!? (suspect looking ends??)
With the new cable, also the old Piezo driver seems to work? (since about 15:25 local, at least for about 10 minutes)
Leave it running, to see if problem re-appears
however the problem re-appears after a 10min warm-up period!!??
14:08Z Go back to the Thorlabs driver. This gives glitch-free lock and valid SDR-counter data

---

after lunch fluorescence seems weak. Re-locking to Rb-lines improves counts 3-fold

---

At this point get: A 1.3% in 11s, B 0.9% in 15s, C 0.8% in 15s
Optimal voltages (Common mode, diff): [ 0.24445048 26.92545019 51.96431002]
ID12794 uMotion search 4x4x4 grid

ID12793 repeat - [2.90072747e-02 2.89735223e-04 1.86382763e+00 2.69222756e-04], Lorentzian FWHM = 2 g = 538.4 Hz
ID12792 scan 1862-1866 - 30% just below 1864 kHz - Lorentzian fit: [2.33235839e-02 3.39371929e-04 1.86379851e+00 3.83917947e-04] (constant, amplitude, f_center, gamma)
ID12781 search for z-resonance at higher frequencies 1856-1866 kHz
ID12790 tickler-correlation, z - no resonance


These can be cropped to show only the ion by:

convert 2021-02-25_A_15s.jpg -crop 150x150+1050+120 A4.jpg

Ion images with different beam combinations:
15s stack of 1s exposures. Old imaging objective, ASI camera, high-gain, no binning (1936x1096 pixels). Pixel size is 2.9 um x 2.9 um. Estimated magnification is 30x
A
B
C
AC
BC
AB
ABC
Fluorescence levels (10ms): A 132.1/3.8, B 127.6/4.2, C 75.8/4.0
Multiple beams: AB 117.7/4.2, BC 154.4/4.3, AC 143.0/4.6, ABC 181.85/4.6
uMotion A 2%, B 0.9%, C 6.1%
Set -6.2 0.23 26.8378 52.4
sweeping V34diff shows A-minimum around 52.5V, finer resolution sweep gives 52.4V
uMotion A 47%, B 45%, C 49%
Voltages now: -6.2 0.23 26.8378 55

Increased AC-setting at 30 Hz gives slightly higher amplitude oscillations, compared to weekend setting of 25 Hz
Weekend had less heat load in the lab

07:37 stop collision monitor
07:36Z ion still stored

2021-02-24 Wednesday

ID12763: Start at 14:48:52 UTZ: Collision monitor with clearout on, with B beam. Tag: 2021-02-24-run1
Counts / 10 ms: Bright: 121, dark: 3.
usual detuning for operation, 208 MHz (check?)
states
dark_durations
bright_durations


AC setting now increased to 30 Hz

Sweeping V34_diff gives new 'optimum':
uMotion A 4.1%, B 1.2%, C 6.1% at [-6.2, 0.23, 26.8378, 55] (down 1.6V from morning value of 56.6V)

uMotion A 30% in 12s, B 30%, C 36% at [-6.2, 0.23, 26.8378, 56.6]
re-lock to Rb-line -> fluorescence restored!
14:33 ion seems dark/gone?

ID12745 test2 of secular scan Lorentzian fit: [2.00147896e-02 2.50019692e-04 1.85449329e+00 3.99132412e-04]

ID12744 test of secular scan with constant+Lorentzian: [2.17395264e-02 2.64289160e-04 1.85434871e+00 4.59689160e-04] (constant, amplitude, f_center, gamma)
Compare this to Matlab fit to same data points?

Try the third (lowest) piezo-channel of the driver. This again initially gives ok comb-lock and beat-note data - but after 1-2 minutes glitches appear again!
rebooting the rep-rate piezo driver seems to remove the glitch - however the problem appears after a few minutes again
Comb rep-reate lock shows 400ms heart-beat error, can't determine line-center from comb data....
ID12736 carrier C1 peaks with 600us probe
+C1 ? see two peaks?
Now optical carrier and side-bands

ID12739 z 1.848 - 1.856 MHz, Lorentzian fit: [3.72032165e-04 1.85437750e+00 6.67644320e-04]
ID12738 r_hi 937-943 kHz,
ID12737 r_lo 885-892 kHz,
(these over lunch). more points and 100 kphotons per point

ID12734 r_lo 885 to 891 kHz, 7 dB - 22% peak at ca 889.6 kHz - Lorentzian fit: [3.85734824e-04 8.89606990e-01 5.82098050e-04]
ID12733 r_hi 937 to 943 kHz, 7 dB - 16% peak at ca 929.1 kHz - Lorentzian fit: [2.93961269e-04 9.39172793e-01 7.09967596e-04]
ID12731 z 1849 to 1855 kHz, 17dB - 22% peak at ca 1852.1 kHz - Lorentzian fit: [3.88708773e-04 1.85215658e+00 6.40710257e-04] (curret ARTIQ fit doesn't have constant background term)
ID12730 r_lo 891 to 897 kHz - no clear peak
ID12729 secular correlation search 943 to 948 kHz, 7 dB att - no clear peak
B-beam in use, 50 kphotons/point
RF monitor ca 3.040 Vpp (slightly lower than y-day?)

Fluorescence levels (10ms): A 139.2/1.56, B 126.46/1.1, C 110.8 / 1.9
At -6.2 0.23 26.8378 56.6 get: A 1.4%, B 3.1%, C 8%
Scanning V34diff shows A-minimum at 56.6 (scanning only V34diff seems to be a quick way to find the optimum from day to day!?)
Maybe V34diff has settled to a lower value again?
uMotion 100kphot: A 74% in 9s, B 73% in 9s, 75% in 9s
Voltages -6.2 0.23 26.8378 63.3441
08:23Z ion still stored. secular sideband measurements completer over night

2021-02-23 Tuesday

15:21Z leave lab

ID12705 z, search21
ID12704 r_hi, search20
ID12702 B-beam r_lo, search19
ID12701 switch to B-beam
ID12700 z, 2 kHz AOM span, search18
ID12699 r_hi, 2 kHz AOM span, search17
ID12698 r_lo sidebands, 2 kHz AOM span, search16
ID12697 z sidebands, search15
ID12696 r_hi sidebands, search14
ID12695 A-beam, r_lo sidebands, wider 1 kHz AOM span, 16 Hz AOM step, C1+ and C1-, 5 ms probe (no OD filter). DB: search13
63 points per peak
C1+ red appears far right in span?

ID12690 r_lo sidebands

uMotion A 66%, B 64%, C (very weak)

ID12676: Photon correlation secular sweep for higher radial: 20 + 7 dB att. Peak at approx. 0.9447 MHz.
ID12675: Photon correlation secular sweep for lower radial: 20 + 7 dB att. Peak at approx. 0.8942586 MHz.
ID12674: Photon correlation secular sweep for axial: 20 + 17 dB att. Peak at approx. 1.8524828 MHz.

ID12673: Secular sweep with 0dB + 22 dB: Lower radial ~ 0.89449 MHz, upper radial ~ 0.94558 MHz
ID12672: Secular sweep with 0dB + 20 dB: Axial: peak at approx. 1.8528 MHz

ID12665: Carrier search for C1, tau_pi = 600 us. 2021-02-23-search11-


ID12659: Carrier search for C1, tau_pi = 600 us. 2021-02-23-search7-

12657: C1+ red low radial?
12658: Rabi on previous. Tau_pi maybe 5000 us
ID12654: Secular search for C1, 2021-02-23-search4-

Tests with objective, umotion again high! V34diff needs 10 more Volts to get uMotion acceptable (sharp camera image)
New imaging objevtive did not show a good image... further testing required

Here uMotion A 0.3%, B 1.1%, C 2.5%
Back to -6.2 0.2358 26.8378 48.3441

ID12569 tickler 20+17 dB, 1864 - 1868 kHz, 30 points - no peak..

At these voltages get 100kphot: A 9.2% in 9s, B 3.4% in 10s, C 5% in 12s
Optimal voltages (Common mode, diff): [ 0.2358202 26.83783696 48.34408991]
Test how trap parameters change at V12cm of -6.0V (previous setting was -6.2V 0.2289 26.8187 48.4554)
ID12562 uMotion scan 4x4x4 (lunch) - USER ERROR: this scan at V12cm=-6.2V as previously....

---

Note matlab lorentzian fit is variant '3c' of lorentzfit:

L3C(X) = P1./((X - P2).^2 + P3) + C

FWHM is computed as:

FWHM = 2 * sqrt( P3 )

fine-resolution correlation measurement of seculars (now with B-beam)
50 kphotons/point
ID12555 scan 890-893 kHz, 30 points, 20 + 7 dB attenuation - peak height up to 40% contrast
ID12556 scan 937-941 kHz, 30 points, 20 + 7 dB attenuation - peak height 14 % (upper radial is harder to excite with tickler - as before)
ID12557 scan 1.864 - 1.868 MHz, 20 + 17 dB attenuation - peak height 30%
RF monitor during these 3.045 - 3.048 Vpp

search for seculars (A beam)
tickler 0 dB + 15 dB attenuation - no clear fluorescence change. search 0.9 to 1.1 MHz
0 dB + 10 dB attenuation
0 dB + 5 dB attenuation. one mode at 939.6 kHz
0 dB + 2 dB attenuation: lower at 891.4 kHz, upper at 939 kHz
0 dB + 20 dB for axial, 1.8-2.0 scan, at 1.86644 MHz

500kphot A 1.8% in 41s, B 1.3% in 49s, C 3.7% in 61s
100kphot A 1.3% in 9s, B 0.9% in 10s, C 2.9% in 13s
found Optimal voltages (Common mode, diff): [ 0.22887765 26.81872373 48.45535893]
ID12530 2x2x2 uMotion search
Voltages at -6.2 0.2832 27 47
uMotion 100kphot: A 17.6% in 9s, B 17.3% in 10s, C 32% in 12s
Fluorescence levels (10 ms): A 160.7 / 2.14, B 133.59 / 1.94, C 98.25 / 2.04
back to 208 MHz detuning

08:31Z stop collision monitor

2021-02-22 Monday

ID12517: Start at 15:00 UTZ: Collision monitor with clearout on, with all beams, detuning = 190 MHz. Tag: 2021-02-22-run1
Counts / 10 ms: Bright: 79, dark: 3.
states
dark_durations
bright_durations


reducing RF-voltage to 4.1Vpp doesn't show two ions - so this is probably a single ion
These are higher than previously during collision-monitoring/clock-runs (ca 60-70 bright counts?)
10ms fluorescence levels A 166.5/2.25, B 145.54/1.94, C 109.88/2.54

all beams ABC show fuzzy image, any single beam sharp image?
uMotion A 14% in 9s, B 9% in 11s, C 22% in 11s
14:39:30 signal (in 3 min)
bias voltages -6.2 0.2832 27 47
RF back to 10Vpp
14:36:30Z try load with 1.60A (1.54W)

changing V12cm from -6.2V to 0V in a single step threw the ions away
reduce RF to 4.0V increases ion-separation clearly on camera
14:30:05Z signal, blurry at first, then two separated ions
14:23Z try to load with 1.65A. detuning 185 MHz, 405nm was up to 7mW - reduce to 3 mW


lowering RF-voltage shows up to three ions! (saved some images)

detuning to 208 MHz
14:16Z signal! fuzzy image
back to voltages -6.2 0.2832 27 47
14:11:15Z load again, 1.7A, detuning to 185 MHz

adjusting RF-voltage down -> maybe two ions in the trap? lost both at RF-glitch
bright ion seems to jump between two positions?? (when switching beams) do we have two ions trapped?
-6.2 0.2831 27 42.4 gives A 15%, B 2.2%
-6.2 0.2832 27 Scan[41 43] B
-6.2 0.2832 27 Scan[38, 43] gives A-optimum at 42V

A 65%, B 68%, C 70%
Optimal voltages (Common mode, diff): [ 0.2778 26.13 47.58]
ID12458 2x2x2 uMotion scan
[0.25, 0.32] [26, 27.5] [46.5 48.5](too large?)

uMotion A 70% in 8s, B 64% in 11s, C 70% in 11s
Voltages -6.2 0.2832 27 47
Lowering trap RF to 5.7Vpp gives stable high fluorescence, 1200 couns / 50ms all beams
try different V34diff voltages, but no clear effect
seem to have something trapped, but fluorescence comes and goes
13:39:35 signal, but fuzzy image of ion? gone quickly?
13:35:30 try to load, 1.7A, detuning to 185 MHz

13:32:15 signal! but lost quickly?
13:26:15 load with dispenser 1.7A. test loading with 208 MHz detuning?!

back to volgaes ion lost during uMotion search?
ID12410 seems to have finished ok?
fit fails because V34diff range was [46.5, 46.5] (no scan at all)
not so reasonable Optimal voltages (Common mode, diff): [ 1.80241039e-15 9.93688436e-17 -2.15053763e-02]
ID12410: NPL search 2x2x2.

Optimize beams and 422 waveplate.
0.2832 27 47 gives A 14%, B 9%, C 21%
0.2832 28.1299 47 gives A 28%, B 26%, C 40%
0.2832 28.1299 46 47 gives A 28%, B 26%, C 40%
ID12380 scan V34diff vs A-contrast. Minimum at ca 47V
uMotion 100kphot A 76% in 9.9s, B 70% in 16s, 71% in 15s
ASE also required re-aligning, got >2-fold more fluorescence (all beams) by aligning ASE
uMotion 100kphot: A 81% in 22s, B 76% in 27s, C 75% in 29s

B > 200 counts in 50ms, C was already quite well aligned, up to 280 / 50 ms afer adjustment
re-aligning beams is required, since V34dif changed som much? 3-fold more A-fluorescece ca 300counts in 50ms
check Rb-lock, locking to the right line gives better fluorescence
422 power only 5uW on breadboard before A-fiber (this usually 10-15 uW), adjustment of 422 breadboard fiber-coupling gives ca 9uW
lowering V34diff to 53V gives the usual diffraction-pattern image of ion
detuning to 208MHz
12:05:50 some weak signal? (ca 3 min loading time - good!?) 12:02:45 load with dispenser 1.7A

405nm adjusted to 3.7 mW
422nm 185 MHz detuning

461nm dispenser test, Ractual 4.642 kOhm, -197.32 mA, test against 5A dispenser ca 2 min to see fluorescence.
RF monitor 3.045 Vpp
Voltages to last known values: -6.2, 0.2832, 28.1299, 85.6211

camera focus back to last value
11:52Z install mid-shield, and imaging objective
08:20Z turn on stuff to prepare for trapping again

Menlo oscillator was on continuously.
A/C VFD was at 25 Hz
With most stuff turned off on Friday, see strange oscillations in lab temperature

2021-02-19 Friday

Leave the RF siggen on/off program on
Clamp down helres trap-side
Trim 3mm off the helres-mount clamp

2021-02-18 Thursday

Before final fine-tuning, vswr with newer rigexpert analyzer:

Helical resonator min SWR was 1.12 @ 14.422, which probably explains lower seculars (qz). HR moved a few mm to the left and towards the trap and rotated ~0.5…1 deg CW seen from tuner end to center helix and to align shield adapter with trap Cu pipe.
Also 0.1 mm soft Cu shield replaced by stiffer 0.2mm Cu. This increased Vmon (helix moved closer to antenna) and required tuning and impedance matching.
After: min SWR = 1.01 @ 14.424 MHz and Vmon = 2.995 Vpp (averaging 32).
R = 50.2 Ohm, X = 0.15 Ohm, Q ~ 800 as before.

NOTE: adjusted A/C to 25 Hz - to possibly reduce temperature swings?

detuning to 185 MHz, 461nm and 405nm lasers on - but no ion?
08:08Z Ion seems lost? Rb-lock was unlocked (large temperature-swings in lab!?), re-lock, but this doesn't restore fluorescence

NPL uMotion program had aborted, due to ARTIQ error? (because of Rb-unlock, or ion loss?)

2021-02-17 Wednesday

Leave 8x8x8 uMotion scan over night
ID12326 ranges [0.1 0.4] [26 30] [80 90]

16:09Z uMotion 100kphot: A 34% in 8.7s, B 31% in 14s, C 24% in 9.7s
The required V34diff might be drifting down during the day?

TLi computed from these: qz=0.3643, a=(-0.00038, 0.0016, -0.0012)

These measured with 10Vpp drive, ca 2.70 Vpp helres monitor, and fixed -6.2 V12cm
Reults to be plotted + Lorentz-fit: axial ID12318, r-lo ID12320, r-hi ID12322

upper radial with photon correlation. B-beam
ID12321 978 to 982 kHz, 20+7 dB att, 10 kphotons
ID12322 with 50 kphotons/point

lower radial mode with photon correlation. B-beam
ID12319 923 to 927 kHz, 20+10 dB att, 10 kphotons
ID12320 20+7 dB att, 50 kphotons

fine-resolution secular scan using photon correlation. B-beam. ( 2020-12-09 results use 13 dB for radials and 21-23 dB for axial)
search areas at 925, 980, and 1892.5 kHz.
use the physical 20dB attenuator
ID12312 1.89 to 1.895 MHz in 30 steps, B-beam, 10 kphotons per point, 20+22 dB attenuation
ID12313 20+26 dB attenuation, 20 kphotons, - too much attenuation, peak height low
ID12314 20+23 dB attenuation - 0.2 peak height
ID12316 20+20 dB att, 10 nbins,
ID12317 20+17 dB att, 0.3 peak height ok? but peak looks a bit noisy?
ID12318 20+17 dB att, 50 kphotons/point (ca 6-7 s/point)

Coarse search for secular frequency.
20dB physical attenuator on tickler-DDS. 0 dB software attenuation
resonance at ca 1.892 - 1.894 MHz ca 96% of 2020-12-09 result (lower than before, 2020-12-09 result with 10Vpp drive is 1.968 MHz)
Try 6 dB sw attenuation, resonance at 1.892-1.893 MHz. (2020-12-09 results have radial modes at 985 and 940 kHz, or 50% and 47.8% of axial)
This would predict current radial modes at 947 and 904 kHz
tickle 0.85 - 1.0 MHz, 6dB, 400 points, but no clear signal (50ms PMT gate).
Try 0dB , also try 100ms gate, remove 20dB physical attenuator and use 15 dB sw attenuation
with 10dB sw-attenuation, one mode at 925 kHz?
try 5dB attenuation, try 0 dB attenuation -> this reveals upper mode at 980 kHz!

B fluorescence 75.7 / 3.96 in 10ms (mid-shield installed, back lab lights on)
B intensity still changes with polarization! Adjust waveplate again.

uMotions: A: 37%, B: 33%, C: 31%

Install mid-shield.

ID12264: Peak search, B-beam, no OD-filters. 2021-02-17-search6-.
C1 linecenter: 75 971 017.0 Hz
C1 B estimate: 1.2443346 uT

C1 peaks

C2 peaks

C4 peaks


ID12258: B-beam Rabi flopping, tau_pi = 0.6 ms:


Adjusting waveplate on 422 breadboard reduces fluorescence change to negligible levels:


Heating B or C fibers by hand seems to give >50% fluorescence change

ID12245 peak search A-beam 350us, no OD filters
C1+ ca 75 974 7, height ca 40
C1- 75 967 5, height 60

Found C1+, rabiflop shows maube 350us tau_pi with A-beam?
seems Zeeman AOM diffraction-order was wrong. Switching to right one gives quantum-jumps as expected.
ID12238 spectrum-scan with 1ms probe, no OD-filter, A-beam
beat-note and excel-sheet suggest line-center around 75.971 150 MHz
Coil currents (-8, 0, 0) mA - same as previously?
A-beam fluroescence 97.4 / 2.4 bright/dark in 10ms
Try to search for the clock-transition?

At this point get: A 3.8% in 13s, B 2.9% in 10s, C 2.4% in 19s
Optimal voltages (Common mode, diff): [ 0.2832 28.1299 85.6211]
ID12223 Try 2x2x2 uMotion scan?

V0 - 0.33VA = 0.2610 27.8855 87.2692, here get A 27.5 %, B 29.8%, C 36.3% - ??
maybe -sign is right?
V0 + 0.33 VA = 0.2612 28.1501 87.5210 here get A 39%, B 29.6%, C 35.5 %
Try moving along voltage-vectors to zero uMotion?
uMotion 100kphot: A 33.8% in 15s, B 29.4% in 12s, C 36.7% in 13s

detuning constant at 208 MHz
Rb-signal has a lot of DC-offset, so this may give some extra detuning?
Re-lock to Rb-line, this gives ca 5-fold more fluorescence and brighter camera image
uMotion 100kphot A 9.7% in 91 seconds!?, B 9.0% in 95s, 11% in 85s
Fluorescence level seems low? camera image weak..

Comb f0 unlocked due to low SNR. re-locked
(lunch)

ID12186: 4x4x4 NPL search around previous value.
Result: [ 0.26114758 28.01782364 87.39507497]
uMotions at optimum: A: 3.6%, B: 5.5% C: 9.2%
Check that the columns of inv(Cfit) are voltage-vectors that change only one contrast!?

% Micromotion contrast model
% S = C (V - V0)
% S has [A, B, C] contrasts
% V and V0 have voltages [V12dif, V34cm, V34dif]
% V12cm is constant -6.2 V in recent experiments
V0 =
    0.2611
   28.0178
   87.3951
Cfit =
   -0.9303   -2.0943   -0.4214
   -0.2217    0.1219   -0.1284
   -0.1447   -0.1542    0.1619
inv(-1*Cfit) =  % sign is arbitrary..
   -0.0004    2.9735    2.3561
    0.4009   -1.5572   -0.1910
    0.3815    1.1746   -4.2519
Example:
Cfit * [-0.0004 0.4009 0.3815]' = [-1 0 0]'
moving along first column-vector of inv(Cfit) changes A by 100% and leaves B and C unchanged.
Cfit * [2.9735 -1.5572 1.1746]' = [0 -1 0]'
Cfit * [2.3561 -0.1910 -4.2519]' = [0 0 -1]'

Manually: 29%, 30%, 31% at [0.25, 29.4, 87]
Manually: A: 53%, B: 1%, C: 21% at [0.3306, 27, 86]

2021-02-16 Tuesday

ID12094 leave uMotion scan over night
8x8x8 grid. voltage ranges [0.5, 1.5], [20, 30], [95, 105]
Result: (Common mode, diff): [ 3.99139299 12.57404019 85.31937744]

1 scanned 25.8, 98: A-optimal (A 1.9%, B 74%, C 40%)
1 25 99 seems roughly A-optimal (A 7% B 65% C 8.4%)
go back to the AC-optimal 1.0 25 100: A 9.7%, B blur 62%, C 7.1% - so AC-optimal point is roughly repeatable

but scanning V34diff or V34cm around here gives more or less the same flat A-contrast values
at 0.3 27 48 get A 21% B 29% C 26%
at 1.0 27 50 get A 22%, B 32%, C 26% - images look blurry, but this may be due to focusing of camera? or beam-alignment needed?
These voltages are far from the 2021-02-03 values [0.28, 27.0, 48.0]...

B-blur better at 1.0 32 102.5 (A blur 57%, B 77%, C 58%)
C-nubunyn at 1.0 28, scanned 102.5 (A 78%, B blur 64%, C 4.1%)
B-blur is sideways, so change C34cm? at 1.0 28 100.2 get (A 71% ,B 78%, C 46%) all images sharp
C-minimum at 1.0, 25, scanned 100.2 (A 1.9% !, B blur 63%, C 0.3%) first found point that is AC-optimal
B-blur better at 1.0, 25, 98.2 (A 45%, B 77%, C 45%)
C-minimum at 1.0, 22, scanned 98.2 (A 75%, B 63% blurry sideways, C 5.2%)
A-blur reduced at 1.0, 22, 96.2 (A 75%, B 75%, C 36%)
C-contrast minimum at 0.6, 22, scanned 96.2 (A 59% blurry, B 66%, C 1.3 %)
C-contrast minimum at 0.6, 23, scanned 97.4 (A 77%, B 68%, C 3.7%)
A-blur reduced at 0.6, 23, 96.44 (A 75%, B 61%, C 20% )
C-contrast minimum at 0.3543, 23 and scanned 96.44 (A 61,6% blurry vertical image!, B 19.5%, C 4.6%) C-contrast minimum at 0.3543, 24 and scanned 97.33 (A 75,6%, 19.4 %)
C-contrast minimum at 0.3543, 23.4963 and scanned 96.88

Manually: A: 75%, B: 27%, C: 13% at [0.3306, 23.455, 97.98685]

Further searching gives 0.3, 29, 93 V. This gives reasonably sharp ion image with clear diffraction rings
Here uMotion A 75%, B 77%, C 76% - correlation histograms roughly sine-shaped

Manually found better voltage combination for A and B (harmonic, but high contrast): [0.9, 28, 91]

detuning changes fluorescence very little - indicating lots of uMotion?
detuning back to 208 MHz (from loading value of 185 MHz)
similar blurred image as before - showing blurred diffraction-rings typical of the imaging objective
blocking some beam briefly gives a cooled ion
12:48:05Z signal (axial mode? not cooled?)
12:43:15Z load with 1.7A dispenser

12:40 throw away old ion(s)
lots of uMotion? maybe have 2 ions?

ID11722: Leave NPL umotion search over lunch.

Ion image blurry, lot of micromotion?
Blink test shows only 2 levels, single ion?
Readjust PMT splitter.

try to align all beams, so we get bright fluorescence
422 detuning to 208 MHz
07:44 signal! quite far right from where camera center was aligned?
07:43 load with 1.7A dispenser
align A-beam with help of output diffraction pattern
remove PMT-splitter, align camera to electrodes

07:31Z dispenser off, no clear signal
07:18Z try to load, 1.7A dispenser.
Adjust 461 current.

06:55Z try to load, 1.7A dispenser. No ion after 15 min.
Adjust A-beam position

2021-02-15 Monday

Cavity drift with minus-K floating now seems better? This day Lunch 12-13 and team-development 13-15 - chronograf figure with local time on X-axis?


need to remove PMT-splitter, to get better image with intensifier?
15:04Z no signal..
intensifier gain 3.77V, PCO camera exposure 222ms
14:53Z try to load, 1.7A dispenser.
install intensifier + PCO-camera

need to install intensifier? to align A-beam?
14:19Z no signal in 14 min.
14:05Z try to load, dispenser 1.7A (1.75W.. rises to 1.815W after 10min)

ASI camera USB-cable pointing vertically down gives horizontal inner-electrode images
with modified imaging-objective (0.5" slimmer lens-tube, to fit outer shield cimney), focus position is ca 1mm back from previous setting
then move in Z 425um up. (upper electrode appears ca 850um up from lower)
focus on lower electrode, then move focus inside 750um/2.
removed also mid and inner shield (camera side) in order to find electrode images
remove outer shield, to align camera to electrodes

no signal in 11mins... check camera alignment to electrodes?
09:00Z try to load, with 1.7A (1.74 W)
RF monitor 2.74 Vpp

Beam powers:
A 461nm, 250 uW (fiber was blocking IR-beam, and temp/current adjusted after moving driver-boxes)
422nm A 0.9uW, B and C 1.0 uW, detuning 185 MHz
405nm A adjusted to 3 mW

Check 461 driver settings: T = 4.642 kOhm , I = -195.23 mA (dispenser 5A and ca 2min as usual)

Adjusted 422 input polarization.

Temperature rise with outer top shield installed

2021-02-08 Monday

14:45Z close cavity-doors after adding 3rd minus-K clamp and aligning laser to cavity

SRS shutter test:
Quiet: 10:06 - 10:19 (STDEV: CH1: 26.4 Hz, CH2: 26.4 Hz), SRS shutter (1 ms probe): 10:21 - 10:34 (STDEV: CH1: 27.4 Hz, CH2: 27.4 Hz).

2021-02-04 Friday

14:47Z close cavity doors
Clamp down minus-K so it doesn't move

turn off cooling-laser, ASE.
no ion.. Storage time from Monday 25.1 to Friday 4.2, ca 11 days?
try large 422-detuning, and ramping back to 208 MHz
try 461nm laser
try 405nm laser
try to re-lock to Rb-line, but no ion..

Shutter noise tests:
Nothing happens: 15:14 - 15:19
Dummy clock run with 1000 ms probe: 15:20 - 15:25

Ion seems to been lost.

ID11687 NPL uMotion search, 100kPhotons. Result: [ 0.24382725 26.82098208 48.19374483]


ID11686 Peak search with OD2+OD3 based on C4 linecenter and B estimates from clock run. Probe = 190 ms, 2021-02-05-search-1
0.4 Hz sampling, 13 Hz range. 2 Hz expected AOM FWHM.


C2 peaks

C4 peaks


Switch to OD2+OD3. Try to operate experiment remotely.
10:16Z Abort clock-run

2021-02-04 Thursday

ID11684: Clockrun with OD1+OD3, 60ms probe, based on C1 estimates of linecenter and B field. 2021-02-04_clockrun1
New compared to last clock-run: Continuous drift-compensation with ARTIQ-DDS, adjusted in real-time to 2h drift-estimate from comb data. 2nd-order servo in peak-lock algorithm.

ID11669: OD1+OD3 peak search with probe = 60 ms. 2021-02-04-search18-. Initialized based on C1 linecenter and B from previous measurement.
C1+ 75 965 302.4 Hz, FWHM 5.6 Hz, h33
C1- 75 959 600.5 Hz, FWHM 7.0 Hz, h43
C1center = 75 962 451.4 Hz, B = 1.016029 uT
C1 peaks


ID11678: Rabi flopping on C1+ with OD1+OD3. ~60ms still ok.


ID11669: OD1+OD3 peak search with probe = 60 ms. 2021-02-04-search17-. Initialized based on C1 linecenter and B from previous measurement.
C1+ Center visually 75.965301
.

ID11673: Rabi flopping on C1+ with OD1+OD3. Excitation only ~16% at max.

ID11671: OD2+OD3 peak search with probe = 190 ms. 2021-02-04-search15-. Initialized based on C4 linecenter and B from previous measurement.
Sampling 0.4 Hz, range 12 Hz. Aborted during C2+.

C1 peaks

C2 peaks

ID11669: OD1+OD3 peak search with probe = 60 ms. 2021-02-04-search14-. Initialized based on C1 linecenter and B from previous measurement.
C1+ 75 965 311.5 Hz, FWHM 7.4 Hz, h30
C1- 75 959 609.5 Hz, FWHM 6.8 Hz, h44
C2+ 75 968 143.3 Hz, FWHM 6.9 Hz, h38
C2- 75 956 774.3 Hz, FWHM 7.9 Hz, h26
C4+ 75 976 676.1 Hz, FWHM 8.4 Hz, h39
C4- 75 948 237.5 Hz, Unreliable fit, noise in the data.

C1center = 75 962 4605.2 Hz, B = 1.016047 uT
C1 peaks

C2 peaks

C4 peaks



ID11667: OD1+OD3 peak search with probe = 60 ms. 2021-02-04-search13-. Initialized based on C1 linecenter and B from previous measurement.
C1+ fit failed. Visually 75.965312
Linecenter 75.9624608364173 MHz.
B 1.016095

ID11664: OD1 peak search with probe = 1.9 ms. 2021-02-04-search11-
C1center = 75.96246910765049 uT
B = 1.017961 uT
Abort after C1 pair.

ID11648: OD1 peak search with probe = 1.9 ms. 2021-02-04-search2-

Drift comp seems stabilized.

C1 peaks

C2 peaks

C4 peaks


ID11643, ID11646: NPL searches with wider range. Trying to debug contrast fitting errors.

uMotions: A: 4% in 12s, B: 1% in 10s, C: 8% in 17s

ID11637: Peak search with OD1. Probe 1.9 ms. 2021-02-04-search1-
+C1 75 965 329.2 Hz, FWHM 240 Hz, h31
-C1 75 959 617.7 Hz, FWHM 212 Hz, h56

C1center = 75 962 473.5 Hz, B = 1.0177363 uT

B-field estimate from the day before (1.018202) seems good enough to predict transition frequencies for OD1.

C1 peaks

C2 peaks

C4 peaks


Adjust comb f0 lock. Restart drift-comp.

07:02Z Abort remaining runs. Drift-comp stopped working 2020-02-03 14:20Z.

2021-02-03 Wednesday

leave OD5, 190ms scan over night... may or may not find something?
clock-laser was unlocked for some time at the start of C1+ scan. from pt 33/1000 onward it should be ok
C1 peaks

C2 peaks

C4 peaks


Go to OD3 and 20ms, to find lost peaks..
4 Hz step, 200 Hz span, 51 pts/peak
C1 fit fails... left in the 200Hz span - can we have this much drift?
C1 peaks

C2 peaks

C4 peaks

scan around 75 965 498, to find C1+?
find only low-height peak, try rabiflop there? get only low counts, so we are off-resoncance?

ID11627 Try instead peak-search with OD4 and 60ms probe
C1+ far left in span, maybe 75 965 498 ? C1- also left? 75 959 780 or lower? (B seems to have decreased? moves C1+ left and C1- right?)
190ms scan is possible only with well-compensated cavity-drift!
ID11619 repeat OD5, 190ms peak-search (search9)

Reset estimates based on C4 linecenter and B-field from OD1+OD3 peak search.

Estimate tau_pi = 190 ms with OD2+OD3

ID11618 Peak search with OD2+OD3, 190 ms probe 2021-02-03-search8-.
Sampling 0.4 Hz, range 12 Hz.

+C1 75 965 513.20 Hz, FWHM 2.2 Hz, h26
-C1 75 959 798.60 Hz, FWHM 2.1 Hz, h41
C2 fit failed. Visually: 75 968 350.4 h37

C1center = 75 962 655.90 Hz, B = 1.018282389 uT

C1 peaks

C2 peaks

C4 peaks


ID11613: Rabi-flopping on C1+ OD1+OD3. tau_pi ~60 ms seems ok.


Reset B-bield and linecenter estimates based on previous C1 peak search.
ID11612 Peak search with OD1+OD3, 60 ms probe 2021-02-03-search6-.
+C1 75 965 513.9 Hz, FWHM 6.5 Hz, h32
-C1 75 959 799.2 Hz, FWHM 7.1 Hz, h41
+C2 75 968 352.7 Hz, FWHM 7.0 Hz, h34
-C2 75 956 959.5 Hz, FWHM 7.4 Hz, h29
+C4 75 976 905.5 Hz, FWHM 7.2 Hz, h36
-C4 75 948 404.0 Hz, FWHM 7.5 Hz, h
C1center = 75 962 656.6 Hz, B = 1.0182969 uT
C4center = 75 962 654.8 Hz, B = 1.0182016 uT
C1 peaks

C2 peaks

C4 peaks


ID11610 Peak search with OD1+OD3, 60 ms probe 2021-02-03-search5-. Aborted after C1 pair.
+C1 75 965 513.6 Hz, FWHM 7.5 Hz, h33
-C1 75 959 798.8 Hz, FWHM 7.0 Hz, h38
C1center 75 962 656.2 Hz, B1 = 1.0183112 uT

ID11607 Peak search with OD1, 1.9 ms probe 2021-02-03-search3-.
+C1 75 965 505.5 Hz, FWHM 196 Hz, h42
-C1 75 965 505.5 Hz, FWHM 228 Hz, h49
C1center 75 962 650.3 Hz, B1 = 1.0175206 uT

uMotions at new 'optimum': A: 2.5% in 11s, B: 1% in 10s, C: 7.7% in 15s
ID11959: NPL search again. Optimum out of bounds again. Selected manually: [0.28, 27.0, 48.0]
ID11594: NPL uMotion search around new 'optimum'.
uMotions at new 'optimum': A: 6.5% in 10s, B: 7.2% in 10s, C: 3.1% in 14s
ID11589: NPL uMotion search. Optimum out of bounds. Manually selecting: [0.29, 26.6667, 48]
uMotions: A: 7.4% in 11s, B: 24.5% in 10s, C:22.0% in 15s

06:50Z Stop clock run.

2021-02-02 Tuesday

ID11583 try to start OD4, 60ms clock-run
Cycle duration is ca 133 seconds. This should roughly match 6 peaks * 2 R/B sides * 100 shots * (100ms probe + 40 ms dead) = 120 s (check what our actual programmed dead-time is?)
For clock-run results see ion.
ID11578 peak-search, OD4, 60 ms (Fourier limit 6.7 Hz AOM)
1.3 Hz step, 30 Hz span, 23 pts/peak
+C1 75 965 645.2 Hz, FWHM 7.4 Hz, h29
-C1 75 959 936.7 Hz, FWHM 7.1 Hz, h39 (right in span)
C1center 75 962 790.9 Hz, B1 = 1.017194 uT
initialize clock-run with these values. (initializing with a C4 peak search might be better? more accurate abs(B) value)

ID11577 peak-search, OD3, 19 ms
2.5 Hz step, 50 Hz span, 21pts/peak
50/100Hz sidebands not resoled? this is not a good probe length?

ID11576 peak-search, OD1, 1.9 ms
now better peak-height with correct tau_pi +C1 75 965 647, FWHM 202 Hz AOM, h38
-C1 75 959 931, 208Hz, h49
C1center 75 962 789, B1 = 1.0185 uT
+C2 75 968 488, 227 Hz, h44
-C2 75 957 102, 229 Hz, h34
+C4 75 977 030, 221 Hz, h47
-C4 75 948 563, 229 Hz, h27

OD1 rabiflop on center gives 1.9ms tau_pi.
674nm power in A-beam seems reduced? re-align?
ID11569 peak search, OD1 and 3ms - but get low peak-height for +C1, so probe length is wrong?
ID11568 rabiflop on +C1 (75 965 644), with OD3,
ID11567 peak search, A-beam, OD3, 30ms probe
2.5 Hz step, 100Hz span, 41pts/peak

ion dark moment? abort
ID11563 peak search, A-beam, OD3, 30ms probe

uMotion at old voltages 100kphot: A 7.3%, B 19%, C 13%

ID11557: OD1 peak search with adaptive Artiq drift comp. 3 ms probe, 2021-02-02-search4-

ID11338.png
uMotions: A: 6% in 13s, B: 22% in 10s, C: 18% in 15s

ion still stored (now 8 days?)

2021-02-01 Monday

Leave 100ms peak-search over night. 0.8 Hz step, 200Hz span, 251 pts/peak
A-beam, 18 dB Zatt., OD4, 100ms probe
C1 peaks

C2 peaks

C4 peaks

---

Quite difficult to get a clock-run to lock to the peaks with so much uncompensated cavity-drift...
100ms peak search again. 0.8Hz step 20Hz span
f_beat_center = 75 962 869
+C1 far left in span ?

Try clockrun initialized with (centers, FWHMs AOM, gains) [75.96589229 75.95992971 75.96885552 75.95696648 75.97778133 75.94804067] [4.e-06 4.e-06 4.e-06 4.e-06 4.e-06 4.e-06] [0.5 0.5 0.5 0.5 0.5 0.5]
100ms probe, 6 peaks gives cycle time of ca 181 s
somehow we again have +10 mHz/s of uncompensated cavity drift. This gives 1.8 Hz @ 674nm drift during the 180s servo-cycle. For a 100ms probe, 8 Hz Fourier limit, this is 1/4th of the FWHM!

ID11534 peak search with 100ms
+C1 far left in span? 75 965 892 (or even lower?)
-C1 right in span 75 959 929
C1 center 75 962 911 and B1 1.06247 uT
predicted line-center from beat-note 75 962 884

Try clock-run with 100ms probe, but servos seem not to find the peaks..

Based on OD3 results, switch to OD4 and 100ms probe.
ID11528 peak search A-beam, 18 dB Zatt, OD4, 100ms probe, 0.8 Hz step, 20 Hz span, 25 pts/peak
+C1 seems far left in the span? 75 965 901
-C1 more centered in span (why?),and higher, 75 959 922
This gives
C1center 75 962 912 and B1 1.06532 uT

With OD3 and 30ms, found C1 peaks:
+C1 at 75 965 910
-C1 at 75 959 920
This gives
C1center 75 962 915 and B1 1.0673 uT
ID11525 A-beam peak search. 18 dB AOM att, OD3-filter, 30ms probe
2 Hz step, 200 Hz span. 101 pts/peak
C1 peaks

C2 peaks

C4 peaks


C beam 106/3 counts in 10ms
B beam 94/3 counts in 10ms
A beam fluorescence 173/4 bright/dark counts in 10ms
422 power A 1.5uW, B 1.9uW, C 1.5 uW
13:05 after many hours of working with the 422-laser (no cooling), ion re-appeared!

repeat measurement of the cavity power-shift (Friday result was 190Hz/V @ 1348 nm)
With reduced FALC-gain, photodiode signal is slightly more than before.

Cavity drift-compensation should also match true cavity drift better than before
13:45Z set-point 0.8 V, 5min beat-note 23 164 432.26 (stdev 30.39 Hz)
13:52 set-point 0.7V (BOA 430 mA), 5 min beat-note 23 164 433.33 (valid data only)
14:01 set-point 0.8V (BOA 480 mA), 5 min beat-note 23 164 434.19 (31.19 Hz) - not much evidence of power-shift?
14:24 set-point 0.9V (BOA 520 mA), 5 min beat-note 23 164 434.41 (32.57 Hz)
14:56 set-point 1.0V (BOA 580 mA), 5 min beat-note (this hits the BOA current limit of 600 mA)

again dark image after power-measurements? takes a long time to cool and get an image?
422nm 0.6uW in A-beam
15-20 uW before ABC-beamsplitter
A-beam fluorescence 32/12 bright/dark in 10ms gate. B and C weaker
09:47Z ion re-appeared!? maybe weaker image than before, lower 422nm power after fiber-adjustments
09:40Z seems we lost the ion?, while adjusting polarization (no cooling-laser)
422nm Polarization extinction ratio improved from 7 dB to 10 dB, on ion-breadboard after 422-laser-fiber, before ABC-beamsplitter

Note on cavity doors closed (Friday):
Coarse heater-power dropped from 90W to 30W - as before. time-constant is 'fast', below one day
Inner shield free-running temperature sensor seems to settle at to a temperature +4...6 mK than before. Very slow settling, maybe a week?


09:24Z adjust comb f0-beat SNR to >25 dB
Updated drift-comp to current observed value of 12.6 mHz/s
Reducing FALC-gain (trimpot) gives lower servo-bump sidebands and more power transmitted through cavity, now 0.85 V

'Heating' fiber by hand, both laser -> breadboard and breadboard -> ion.
ID11492: A-beam, samples: 0-200: laser-> breadboard, samples: 200-350 breadboard->ion, 350 ->: laser to breadboard. Changes mostly in first case.
ID11490: C-beam, samples: 0-200: laser-> breadboard, samples: 200-350 breadboard->ion, 350 ->: laser to breadboard. Changes in both cases.
ID11488: B-beam, samples: 0-200: laser-> breadboard, samples: 200-350 breadboard->ion, 350 ->: laser to breadboard. Changes in both cases.
ID11486: A-beam, PMT count changes with heating laser -> breadboard, but not with breadboard -> laser.
Check 422 beam polarizations.
Cancelled long experiment from ID11481 forwards.

2021-01-31 Sunday

Leave B-beam, OD5, 60 ms peak search over night
Maybe 50/100 Hz sidebands are smaller, when t_probe is a multiple of 10 or 20 ms?
ID11477 (narrow span), 11478(search5), 11479(6), 11480(7) (aborted), 11481(8) (cancelled), 11482(9) (cancelled), 11483 (10)(cancelled)
C1 peaks

C2 peaks

C4 peaks


Try B-beam instead?
rabiflop with OD3 suggest maybe 10ms tau_pi?
peak-search with 10ms and OD3
OD2 tau_pi looks like 3ms
OD3 maybe 10 ms
OD4 no clear oscillation?
OD5 rise tp 60ms, then flatish

recalculate peak-positions based on beat-note and latest B1-estimate.
try peak-search with OD1 and 100ms probe
+C1 at 75 965 640. try rabiflop there.
no clear signal, try OD3 and 30ms instead.
ID11467 peak-search with OD3 and 30ms
rabiflop on 75 965 669, with OD3. no higher than 25 counts?

abort long run.

2021-01-30 kiky-Saturday?

ID11461 OD3+OD2 and 290ms peak search, long, over night. 290ms is a guess of tau_pi, might be too long?
18dB Zeeman AOM atteunation.
0.3 Hz step, 150 Hz span, 501 pts/peak
duration ca 30s per point = 4 hours per zeeman peak! done in ca 24 hours..
Fourier limit 2.8Hz optical, 1.4 Hz AOM. ca 5 steps of 0.3 Hz AOM each
C1 peaks

C2 peaks

C4 peaks



ID11460 peak search with OD3 and 29ms probe
49pts/peak. 150 Hz span, 3 Hz step
Fourier limit is ca 25 Hz - so the 50/100 Hz sidebands are resolved.
C1 peaks

C2 peaks

C4 peaks


ID11458 peak search with OD1 and 2.9ms probe
+C1 75 965 242, FWHM 174, h26
-C1 75 959 314. FWH; 153, h34
C1center 75 962 279, B1 1.0562 uT
+C2 75 968 195, FWHM 159, h35
-C2 75 956 362, FWHM 169, h31
+C4 75 977 060, FWHM 152, h27
-C4 75 947 479, FWHM 149, h18

Estimated line-center from comb 75 962 255

here get: A 6.7%, B 13.3%, C 8.4 %
algorithm suggests [ 0.27459138 26.48031258 49.01349212]
old voltages: 0.2693, 26.9714, 49.4475.
ID11446 Try short uMotion-search 3x3x3 grid with 30kphotons
uMotion 100kphot: A 15.3%, B 14.7%, C 9.6%

15:56Z stop collition monitor
cavity output-power now more than on Friday? ca 0.7 V
comb f0 lock seems very unstable
fiber was blocking ion-breadboard 674nm power-detector...
turn on comb, comb-branch, clock laser
15:50Z ion still stored

2021-01-29

16:27Z leave lab.
16:20Z start collision-monitor with 10ms gate, 65/3 bright/dark. DB tag '2021-01-29-run1'. NO clearout.
states
dark_durations
bright_durations

Fluorescence levels 66 / 2.8 in 10ms
Switch to B-beam.

---

Turn off clock-laser and beat-note branch
Comb f0 unlocked. (maybe lab-temperature changes when cavity-box was closed?)
Cavity drifts too much to leave any useful clock-laser runs

ID11439 re-start OD3/29ms search, with wider span, since we have so much uncompensated cavity-drift.
71pts/peak
C1 peaks

C2 peaks

C4 peaks


ID11438 peak search with OD3 and 29ms probe (Fourier limit 13 Hz AOM)
Note we have 50-60 mHz/s uncompensated cavity drift!
C1 Gaussian fit fails...

ID11437 repeat peak-search (since something jumped??)
Cavity drift seems to be 70 mHz/s - since we touched the cavity when testing power-shift
OD2, 9.9ms
C1 75 964 506, FWHM 97 Hz, h24 and 75 958 555, FWHM 107Hz, h36
C1center 75 958 555, B1 1.0604 uT
C2 75 967 440, FWHM 107 Hz, h38 and 75 955 605, FWHM 123 Hz, h21
C4 75 976 334, FWHM 94 Hz, h32 and 75 946 679, FWHM 89 Hz, h21
duration 783s
C1 peaks

C2 peaks

C4 peaks


ID11436 peak search, OD2, 9.9ms probe (Fourier limit 40 Hz AOM). 8 Hz step, 170 Hz span
C1 75 964 528, FWHM 93 Hz, h21 and 75 958 587, FWHM 103 Hz, h31
C1center 75 961 557, B1 1.0587 uT
C2 75 967 452 FWHM 112 Hz, h32, and jump??
C4 only zeros?
C1 peak

C2 peaks

C4 peaks


ID11435 Repeat OD1 peak search for C1 pair. 3.3ms probe (Fourier limit 121 Hz AOM), 25 Hz step
C1 FWHMs 134 Hz and 150 Hz
C2 FWHMs 150 Hz and 164 Hz
C4 FWHMs 133 Hz and 137 Hz
(measurement time 688s)

C1 peaks

C2 peaks

C4 peaks


ID11422: Rabi flop with OD1, att. 18 dB. tau_pi 3.3 ms. -> use 10 ms for OD2


ID11418 Line scan over C1+ with 18 dB att. and OD1.

ID11415 Rabi flopping on C1+ with 18 db att. and OD1. Measurement was off-peak.

ID11411 peak-search with OD1 and 3ms probe. 15 dB att. C4+ fit wrong. Corrected dataset manually.
13:08 close cavity doors

---

Try to measure cavity power-shift.
ca12:20Z: 0.40 V power-servo set-point (servo measures cavity output-power with photodiode, and steers BOA 1348nm amplifier current)
12:24 feedback off
12:24:30 0.3V set-point, feedback ON
1s comb-data noise is ca 25 Hz at IR frequency of 222.5 THz (1e-13, the maser noise level at 1s)
5min = 300s average should give 1/sqrt(300) of this, or 1.4 Hz @ IR = 2.2e-14
12:32 adjust power-servo, set-point 0.4V (servo on causes BOA current variations 450-490 mA)
5min beat-note 23 161 465.41 (1s stdev 25.8)
12:37 servo off
12:39 servo set-point 0.3V (BOA current 350-380 mA) - servo-bumps on beat-note SA look much smaller
5min beat-note 23 161 492.17 (1s stdev 27.2)
12:44 servo off
12:46 set-point 0.35V (BOA current 410-440 mA)
5min beat 23 161 508.94 (1s noise 25 Hz)
12:52 set-point 0.45V (490-530mA)
in-loop photiode scope-signal at mu=451, 450.9, 451.0, 451.0, 450.9, 451.0, 451.2 451.1 451.0 451.1 mV
5 min beat 23 161 522.1 (25.3 stdev)

Power-shift slope is 190 Hz / V of frequency shift in IR, relative to cavity-output photodetector voltage
This is 8.5e-13 fractional per volt.
If we want a 1 Hz 674nm laser-stability, we need 0.5 Hz in IR, or 2e-15 fractionally
This leads to a requirement of 2.6e-3 for the fractional voltage stability of the photodetector
Closed-loop we see 0.3mV/450mV which is 7e-4 fractional

---

uMotion contrasts with new voltages [ 0.26927269 26.97143157 49.44745276]: A: 2% in 11 s, B: 5% in 12 s, C: 2% in 17 s

ID11403: NPL search for umotion minimum: 4x4x4. Result: [ 0.26927269 26.97143157 49.44745276] (optimum now within search-grid?)

Cfit11403_inv =

   -0.0203    2.7627    2.2088
    0.3076   -1.4601    0.2457
    0.2695    1.1614   -3.8900

Previous voltages: (0.3821,26.7839,51.0685)
ID11400: NPL search for umotion minimum: 4x4x4. Result: [ 0.22398756 27.24888464 49.35180688]

uMotion 100kphot: A 30% in 10s, B 46% in 11s, C 23% in 13s

Peak search terminated (ID11392). Partial +C1 data in DB.

2021-01-28

(rabi-sinc with transform-limited FWHM shown for reference)


ID11391, ID11392: Overnight: Peak search with OD2+OD3 filter, 225 ms probe
DB-tag: 2021-01-28-search14-, -search15-.
Fast drift comp. Estimated length of one search: 2.2 hrs per peak = ~13 Hr
100 Hz span per peak. Step: 0.3 Hz, 333 pts/peak. Fourier limit 1.78 Hz AOM
C1 peaks

C2 peaks

C4 peaks

---

ID11387, ID11388: Rabi flop with OD1+OD3. tau_pi closer to 75 ms. -> use 225 ms probe for OD2+OD3.


ID11386: Scan over +C1 with OD1+OD3 filters, 72 ms probe, DB-tag: 2021-01-28-run8. With fast drift-comp.


ID11385: Peak search with OD1 filter, 3 ms probe, DB-tag: 2021-01-28-search12-. Fast drift comp.
+C1: height 28, FWHM: 173 Hz
-C1: height 42, FWHM: 178 Hz
+C2: height 42, FWHM: 172 Hz
-C2: height 27, FWHM: 147 Hz
+C4: height 53, FWHM: 152 Hz
-C4: height 30, FWHM: 163 Hz
C1 peaks

C2 peaks

C4 peaks


ID11382: Scan over +C1 with OD2+OD3 filters, 216 ms probe, DB-tag: 2021-01-28-run7. With fast drift-comp.


ID11381: Scan over +C1 with OD1+OD3 filters, 72 ms probe, DB-tag: 2021-01-28-run6. With fast drift-comp.

Disable drift-comp in crontab, and update drift-DDS every second: ID11378: Scan over +C1 with OD1+OD3 filters, 72 ms probe, DB-tag: 2021-01-28-run4. With fast drift-comp.


ID11377: Scan over +C1 with OD1+OD3 filters, 72 ms probe, DB-tag: 2021-01-28-run3. With normal drift-comp.

ID11376: Scan over +C1 with OD1+OD3 filters, 72 ms probe, DB-tag: 2021-01-28-run2. With normal drift-comp.


ID11375: Scan over +C1 with OD2+OD3 filters, 216 ms probe, DB-tag: 2021-01-28-run1


ID11373: Peak search with OD1+OD3 filters, 80 ms probe, DB-tag: 2021-01-28-search9-. Aborted after C1-

ID11372: Peak search with OD1 filter, 3 ms probe, DB-tag: 2021-01-28-search8-. Data looks OK now.
+C1: height 34, FWHM: 151 Hz
-C1: height 47, FWHM: 162 Hz
+C2: height 44, FWHM: 164 Hz
-C2: height 27, FWHM: 151 Hz
+C4: height 44, FWHM: 160 Hz
-C4: height 26, FWHM: 170 Hz

Switch back to A-beam
It turns out, that C-beam was on?!?!

ID11363: Rabi flopping without OD filters
ID11351: Peak search with OD1, peaks seems really broad.

re-lock comb f0
uMotion 100kphot: A 18.2% in 10s, B 38% in 9s, C 9% in 18s

08:40Z ion still stored. Clock-laser locked. Comb f0 unlocked sometime during the night
60s stack of 1s exposures. old objective, ASI camera

2021-01-27

Scan results:
ID11337 (run4), 11338 (run5), (18 local)
ID11339, 11340 (19 local)
ID11341, 11342 (20 local)
ID11343 (21 local)
ID11344, 11345 (22 local)
ID11346 (run13), ca 23 local?

overnight scans:
OD3+OD1 filters, guess 72ms tau_pi (Fourier limit 5.6 Hz AOM). scan C1+ many times. 400 Hz span, 1Hz step
each scan takes 4900 seconds = 1.4 hours
10 scans in the queue, run3 thru run13

---

ID11322 peak-search with OD2 and 7.2ms probe (Fourier limit 56 Hz AOM). 400Hz span, 10Hz step, 41 pts/peak
C1+ h 24, FWHM 109 Hz
C1- h 38, FWHM 99 Hz
B1 1.0585 uT, linecenter 75 962 451
C4+ h 32
C4- h 18

Try OD2 filter.
ID11319 rabiflop on +C1, tau_pi 7.2 ms?


ID11315 rabiflop on +C1.


ID11314 peak search with OD3, 20ms probe (guess of tau_pi), Fourier limit 20 Hz AOM, 200 Hz span, 5 Hz step, 41 pts/peak
+C1 75 965 411, h 13, FWHM 89 Hz but Gaussian fit does not fit central peak
-C1 75 959 471, h 21, FWHM 76 Hz. Central peak ca 25 Hz AOM wide
B1 1.058 uT
linecenter 75 962 441 Hz
C2+ 75 968 369, h 22, FWHM 96 Hz
C2- 75 956 527, h 18, FWHM 79 Hz
C4+ peak is far left in the span, B-field estimate too high?
C4- peak is far right in span

Repeat OD1 search (ID11313), Influx tag: 2021-01-27-search6-
all peaks roughly transform-limited with 3 ms probe


Rerunning peak search with OD1 (ID11312), probe 3 ms, Fourier limit 133 Hz AOM, Influx tag: 2021-01-27-search6-: C1+ heigth 33 FWHM 154 Hz
C1- height 40 FWHM 166 Hz
C2+ height 34 FWHM 191 Hz
C2- height 24 FWHM 166 Hz
C4+ height 49 FWHM 155 Hz
C4- height 29 FWHM 152 Hz

Problem with saving Zeeman-peak data in peak-search program. Problem corrected.

Try OD3 filter, should work with 27ms?
ID11286 peak search, A-beam, OD3 filter, 27ms probe. Fourier limit 15 Hz AOM. 150 Hz span, 3 Hz step, 49 pts/peak
(db tag 2021-01-27-search5-)
+C1 central peak looks OKish, but Gaussian fit is to all of data. no clear 100Hz sidebands?
Other peaks looks similar
Clock probe maybe too long?

Try OD2 filter, should work with 9 ms probe
ID11285 peak search, A-beam, OD2 filter, 9ms probe (Fourier limit 44 Hz AOM). 250 Hz span, 10 Hz step, 25 pts/peak
(Note Fourier limit close to AC frequency of 50Hz - could interfere?)
(db tag 2021-01-27-search4-) +C1 h 22, FWHM 136 Hz AOM - looks noisy, Gaussian not a great fit (span is a bit narrow)
-C1 h 34, FWHM 115 Hz - B1 1.065 uT - linecenter 75 962 441 Hz
+C2 h 33, FWHM 140 Hz - strong sidebands at 5 steps = 50 Hz AOM = 100 Hz optical from center! - Gaussian is fit to everything, not only central peak
-C2 h 21, FWHM 153 Hz - also sidebands
+C4 h 37, FWHM 104 Hz - highest peak in this run! - not any wider than C1/2, so isn't limited by B-field?
-C4 h 79, FWHM 110 Hz - Gaussian covers central peak and side-bands..
(duration 903s)

Try OD1 filter, this should work with 3ms probe
ID11283 (data file stored as ID11284?) peak search, A-beam, OD1 filter, 3ms probe (Fourier limit 133 Hz AOM). 500 Hz span, 25 Hz step, 21 pts/peak
(db tag 2021-01-27-search3-)
+C1 h 33, FWHM 157 Hz AOM
-C1 h 46, FWHM 157 Hz - B1 1.066 uT - linecenter 75 962 434 Hz
+C2 h 45, FWHM 142 Hz
-C2 h 25, FWHM 175 Hz
+C4 h 45, FWHM 164 Hz
-C4 h 26, FWHM 183 Hz
(duration 683s)

---

ID11275 NPL uMotion search over lunch. 4x4x4 grid
algorithm suggests Optimal voltages (Common mode, diff): [ 0.38212489 26.78389499 51.06850713] - both first and last value are outside scan range.
Try suggested voltages.
uMotion 100kphot: A 4.7% in 14s, B 27.3% in 12s, C 12.9% in 14s. (overall better than before, but not optimal)

ID11274 peak-search with 1000us probe (Fourier limit 400 Hz AOM). 1.5kHz span, 80 Hz step, 19 pts/peak
+C1 height 43, FWHM 384 Hz
-C1 h 52, FWHM 423 Hz - B1 1.064 uT - liencenter 75 962 455 Hz
+C2 h 50, FWHM 405 Hz
-C2 h 41, FWHM 356 Hz
+C4 h 51, FWHM 432 Hz
-C4 h 30. FWHM 415 Hz
(duration 607 seconds)

ID11272 rabilfop on +C1, to 5 ms probe. tau_pi ~ 1ms (this might give better peak-heights than previous peak-search)

ID11271 rabiflop on +C1

Peak search (ID11270, 18 dB att., 500 us probe):
+C1: Center = 75.9654 MHz, height 20, FWHM: 890 Hz.
-C1: Center = 75.9594 MHz, height 27, FWHM: 942 Hz.
+C2: Center = 75.9684 MHz, height 35, FWHM: 873 Hz.
-C2: Center = 75.9565 MHz, height 22, FWHM: 861 Hz.
+C4: Center = 75.9773 MHz, height 22, FWHM: 862 Hz.
-C4: Center = 75.9476 MHz, height 12, FWHM: 840 Hz.
B estimate = 1.07137 uT.

Coil currents set to (-8,0,0).
-3 floor A/C setting is 20 Hz

NOTE uMotion contrasts not optimal, all beams ca 30% now!

ID11260 compare to non-zero B-filed by flipping I1 sign, currents: (+4.4719, -1.0115, 1.0309) mA. lower 18 kcounts/s at max
ID11258 repeat A-beam detuning scan, 1000ms gate. Far detuned 2 kcounts/s, near resonance max 21.3 kcounts/s
ID11257 A-beam detuning scan - no Dork-resonances apparent..

ID11254 clock-spectrum with zero B-field, 500us probe (Fourier limit 800 Hz AOM), 3 kHz span, 50Hz step
Gaussian fit FWHM 908 Hz
center 75 962 438
height 88

ID11252 rabiflop on center, in zero B-field, visually tau_pi ca 500us

ID11248 clock-spectrum with zero B-field?
A-beam, 600us probe (Fourier limit 667 Hz AOM), 100Hz step, 5 kHz range. zeeman AOM attenuation 18dB from y-day
Gaussian fit FWHM 760 Hz AOM
center 75 962 481 Hz


Try the zero B-field currents I1 = -4.4719, I2 = -1.0115, I3 = 1.0309

uMotion 100kphot: A 36.3% in 9s, 30.4% in 10s, 28.7% in 13s

08:19Z ion still stored, clock-laser locked to cavity, but comb f0 was unlocked.

---

Initial coil results:

B = B0 + A I

Ab =
    0.2649(2)         0         0
         0    0.41962(14)         0
         0         0    0.2713(2)
 
B0b =
    1.1847(14)
    0.4244(9)
   -0.2796(14)
% current giving zero field
IO = [-4.4719   -1.0115    1.0309] mA

2021-01-26

Overnight coil-characterization
A-beam, 600us probe, 500Hz step (note this is quite sparse sampling... Fourier limit 667 Hz AOM), 50 kHz span, 101 points per spectrum
ca 5s per point, so only 500s per spectrum. We have 3*6 spectra, so 3*6*500 = done in 3 hours.
step each current: +2, -2, +4, -4, +8, -8 mA.
2021-01-26-coil-0-0-0 is the first run, with zero currents
0, 0, 0
+2, 0, 0
-2, 0, 0
+4, 0, 0 leave lab around 17:10 local, artiq got to this point.
-4, 0, 0
+8, 0, 0
-8, 0, 0

0, +2, 0
0, -2, 0
0, +4, 0
0, -4, 0
0, +8, 0
0, -8, 0

0, 0, +2
0, 0, -2
0, 0, +4
0, 0, -4
0, 0, +8
0, 0, -8

Note the last coil characterization results from 2020-08-19: (coil sensitivities very similar on 2020-06-12)

% 2020-08-19
A2 = [0.216895938211581                   0                   0;
                   0   0.325633046718816                   0;
                   0                   0   0.208504965524669];
B02 = [1.085916150083249, 1.291554002640864, -0.100996485194311]';

orange: zero coils
blue: I1 varied
red: I2 varied
green: I3 varied

---

Remove OD-filters, for overninght coil characterization
A-beam, no OD filters, rabiflop shows 600us tau_pi


Spectrum with 4.5ms and 18dB attenuation. Fourier limit 89 Hz AOM
Gaussian fit FWHM 124 Hz AOM
center 75 963 825 Hz

Try increasing Zeeman AOM attenuation, to only slightly lower probe intensity. Attenuation 18dB.
Rabi-flop on center gives 4.5ms tau_pi


ID11197 scan with OD2 and 3.2ms. Fourier limit 125 Hz AOM
Gaussian fit FWHM 144 Hz AOM
Center 75 963 826
ID11195 rabiflop on center, OD2 filter. tau_pi 3.2ms

OD3 filter is too hard? go back and try OD2 filter?

re-run rabiflop on center

re-run +C1 scan with 9400us probe (Fourier limit 42 Hz AOM). A-beam, OD3 filter
Gaussian fit FWHM 102 Hz AOM

Rabiflop, to find tau_pi?

OD3 filter, 15ms probe, scan around +C1


OD2 filter, 4500us probe, scan around +C1


Try coil currents (-4, 0, 0) mA, scan with 450us


Peak-search with A-beam and 450us probe:
but doesn't find C1.

rabiflop on -C1, visually tau_pi ca 450 us
P674_A = 0.8 uW, no OD-filters (note B-beam had about 5uW!)
Try A-beam, it may have better 422nm polarization?
ID11174 scan with 600us probe pulse


C1 peak search OD3+OD1 filter, 15 ms probe, 5 Hz step, 100 Hz span, Fourier limit 27 Hz AOM
+C1 not a great peak..
-C1 75.960007, FWHM 70 Hz AOM, h 22 (Gaussian fit not so great)

C1 peak search, OD3 filter, 5400us probe pulse, 300 Hz span, 20 Hz step, Fourier limit 74 Hz AOM
+C1 75.964675, 129 Hz, h 19
-C1 75.960007, 124 Hz, h 35
B1 = 0.832 uT

C1 peak search, OD2 filter, 1800us probe pulse, 500 Hz span, 50 Hz step. Fourier limit 222 Hz AOM
+C1 75.964672, 272 Hz, h 19
-C1 75,962336, 246 Hz, h 48
B1 = 0.832 uT

C1 peak search +C1 75.964650, 703 Hz AOM FWHM, height 30
-C1 75.962345, 753 Hz FWHM, height 32
B1 0.821 uT

Coil sensitivity roughly dB/dI1 = 0.24 uT/mA ?? (compare to previous results)
abs(B0) field at zero coil currents 1.3 uT?
Lineshape scan, OD1: ID11132
Change coil currents to (-2,0,0)


Lineshape scan, OD1: ID11130. C2 peaks (?): 75.97232, 75.95232
Change coil currents to (2,0,0).

Install the OD1 filter, this should increase tau_pi 3-fold, to 600us.
ID11121 scan spectrum with OD1 filter, 600us probe, 40 kHz range, 200 Hz step. Duration 800s


Comb f0 had unlocked over lunch, fixed by adjusting waveplates in GUI

All peaks seem to fit within 40 kHz AOM
ID11120 wider spectrum scan with 200us probe
C1 separation looks like roughly 15 kHz AOM ?


ID11119 rabiflop on +C1(?), tau_pi ca 200us
ID11118 initial clock transition scan with 15dB AOM attenuation, 600us probe pulse.

674 power in B-beam: 5 uW

Detuning scans: A: ID11108, B: ID11110 C: ID11112. Gate 20 ms. Counts: ID11115 (dark approx. 10)

Manually trying: (0.28, 27.3333, 53.3333): 8%, 6%, 3%

Automatic NPL search (ID11098) gave weird result [ 0.08607781 32.11213181 52.31081692]

Try (0.3571, 26.8571, 53.5714), got 3%, 31%, 3%

-0.05B step to (0.1334, 26.77556, 54.59336) gives (3%, 2%, 39%)
Repeating search with (0.2489, 26.6999, 54.6666) gives now 7%, 25%, 29% (repeat 10%, 29%, 36%)

NPL search finished with [ 0.33088186 27.33750859 54.74849937], but ion seems to have disappeared during the night.
Last measured contrast seems ok.
Ion reappeared after switching on all beams.
Contrast with new voltages: 33%, 32%, 16%

2021-01-25

Leave NPL-algorithm running, 8x8x8 grid
ID 110100

By scanning V34diff, found B and C optimal point:
Contrasts: 30 1.4 3.9 %
Voltages: 0.2489, 26.6999, 54.6666

Found rough optimum for B beam, by stepping along the B-vector
Contrasts: 71, 13, 69 % at voltage of (0.841, 26.692, 47.1523)

From 2020-10-05 we have some notes on the cardinal directions:

Cfit9327_inv =
    0.2372    2.3100    1.9737
    0.4131   -1.5132   -0.0264
    0.6644    1.4648   -3.8875

uMotion 100kphot: A 70% in 10s (B and C similar ca 70%)

Coil currents from December were (127.7, 6.1, 18.4) mA. Now set them all to zero

Adjust alignment into 844nm amplifier - seems to improve 422nm power
422nm power seems halved compared to start of day - fiber coupler between 422-laser and ion-breadboard?
uMotion 100kphot: A 73% in 58s

Install mid shield
Install inner shield
Install pt100 sensor on IR side window flange

uMotion 100kphot: A 82 % (anharmonic) in 38s, B 73% in 56s, C 76% in 75s (Note no shields!)

C ca 70 counts/50ms
B ca 100 counts/50ms
A-beam and ASE alignment optimization gives ca 140 counts in 50 ms
Found PMT signal, in upper left corner of camera image, as before.
ion is still stored, Z-focus of camera was wrong..

Align PMT-splitter with help of 422-fiber-end placed at PMT position. This allows aligning the PMT-splitter so 422nm-light is bright at analog camera on IR side
Lost ion (?) while swapping cameras etc.
Install the PMT-splitter next

Switch to the ASI camera. Remove intensifier/PCO.

Align B-beam (thru-transmitted diffraction pattern) -> get fluorescence (slightly weaker) with only B also.
Align C-beam -> we get fluorescence with only C now also.
Try camera (z) focusing - but it was already quite optimal. (thus aligning the camera to the electrodes, and defocusing by 750um/2 is a good way to z-focus the camera)
set detuning to 208 MHz - more fluorescence
optimize A and ASE directions, but no major fluorescence changes. PCO camera to 200ms exposure
11:53:15 see single(?) ion? load time 5min 15s
11:48 try to load single ion. 1.7A dispenser


throw away cloud by shutting off RF
A cooling shows cloud, B and C quite dark (do not cool much?)
11:43:37 dispenser off. cloud remains
11:42 see a cloud! (intensifier gain higher, PCO exposure up to 1.2 seconds). A-beam adjustments while dispenser on finally revealed the cloud.
stopping down the imaging objective with the iris reduces a vertical strange 422-reflection in the camera image
11:27:15Z try load, dispenser 1.7A. Intensifier gain 2.7V, PCO camera 200ms exposure

Align ASE beam with the analog camera, A-beam with the thru-transmitted diffraction pattern from the electrodes.
Optical power in the beams:
422nm A 0.9 uW, B 1.1uW, C 1 uW. 185 MHz detuning
461nm A 180 uW
clearout 65 uW
repumper 10.8 mW
405nm A 3.6 mW

RF 14.424 MHz, 10Vpp generator, 2.759 Vpp monitor (scope in averaging mode)

Latest bias-voltages are from 2020-10-29 (?). They are -6.2, 0.2635, 27.0703, 46.7861. Apply these.
This gives individual voltages: V1 = -6.4635, V2 = -5.9365000000000006, V3 = -19.715799999999998, V4 = 73.8564

Analog camera images IR/ASE side. Intensifier + PCO images ion.
Remove mid top-shield, and inner shields - to allow aligning beams. Mid bottom-shield(s) need not be removed?
Try to trap again?

2021-01-24

Temperature rise with thermal compound between helical-resonator and alu-mount.
Adding thermal compound changed helres heating from 120 mK to 90 mK.

2021-01-22

Installed longer antenna: monitor voltage now 2.78Vpp! f = 14.422 MHz

re-tune SWR close to 1.0. Monitor 60 mVpp with 10Vpp drive from siggen
Install heatsink-compound between helical-resonator and alu-mount

Install inner and mid-shields. Seems to fit OK. Beams go through shield-holes OK.
Note back feet of mid-shield bottom left/right half did not fit the designed M3 holes - they loose between bottom shields and pump-chamber

Tickler voltages measured after coupling capacitor (at eletrode) with 10x probe. Voltages are peak-to-peak

Measured voltages seem low. Capacitors of the DC filter (fig. from OC18 guidelines) equal to approx. 0.5 or 0.25 ohms at 1 MHz and 2 MHz respectively.
This seems to load the DDS output significantly

Without attenuator

f (MHz), DDS att., V

1.0 5 distorted..
1.0 10 7.4 mV
1.0 15 4.4 mV
1.0 20 2.9 mV
2.0 5 distorted..
2.0 10 3.0
2.0 15 2.0 mV
2.0 20 1.5 mV

20 dB attenuator

f (MHz), DDS att., V

1.0 3 1.97 mV
2.0 3 ~500 uV (noisy)

2021-01-21

Mu-Shields delivered. Inner and mid-shield unpacked - looks ok. Quite heavy duty material thickness!

Tomorrow: Check ASE-beam alignment (analog camera), RF trap drive OK?
15:03 no signal, dispenser off
Intensifier gain turned up, PCO exposure ca 100-200ms
14:51Z try to load with 2.0A. Now using image-intensifier and PCO camera.

Field of view now larger, both top and bottom almost in same view
NOTE: Image-intensifier input side is closer to the electrical wires. 3 wires: Orange (+5 to +15 V supply, 30 mA), White (Control voltage 0-5 V), Grey (Ground).
Use the old PCO-camera, to image the intensifier output plane
Install the (new) image-intensifier, this may help detect weak signals?

12:56 no signal, dispenser off
12:46 try load with 2.0A dispenser (2.3W initially)

check Rb-lines, they look ok
check 461nm with dispenser: 198.2 mA, 4.645 kOhm
12:32Z no signal, dispenser off
12:17Z try to load, 1.7A dispenser
remove PMT-splitter, to get more signal to camera. Use old imaging-objective. re-align objective to electrodes
(O-ring inside PMT-splitter-cube was loose?) blocking light thru lid is important

11:07Z no signal, dispenser off
10:53Z try to load, 1.7A dispenser

09:46 no signal, dispenser off.
09:32Z try to load, 1.7A dispenser
with old objective A-beam window reflection is quite strong, and exits the objective-tube towards B-beam post
new objective may have issues with beam window-reflections? Brass tubes used as spacers may need to be painted black?
test new imaging objective - but no huge improvement in image-quality of electrode image with flashlight illumination
realign camera to electrode image

08:52 no signal, dispenser OFF
08:37Z load with 1.7A dispenser
trap RF as before. monitor waveform seems jumpy!?

Optical power (slim sensor)
422nm A-beam 0.8uW, B 1.1 uW, C ~1uW
461nm A 200uW
405nm adjust to 3.7 mW
clearout 64 uW
repumper 10.6 mW

align A-beam with help of electrode reflections
remove inner shield (outer shield was removed yesterday).

win machine tilted? reboot.

2021-01-20

13:28 no signal, dispenser OFF
adjust A-beam, based on output beam shape...(??)
13:15 try 1.7A dispenser, 1.7W
13:13 no signal, dispenser OFF
13:01Z try again with 1.6A Dispenser. 422nm Rb-lines checked, 405nm power checked. A-beam output doesn't look very clean (hits some aperture somewhere?)

12:50 no signal, dispenser OFF
12:47 no signal in 10min..
12:37:30Z dispenser on, 1.6A. 1.45W initially, rising slowly to 1.5 W
Try to load with 1.6A dispenser current

Trap RF from signal generator 10 Vpp, 14.424 MHz
monitor 64 mVpp

Preparing for trapping.
461 dispenser check, OK at I = 198.3 mA, T = 4.645 kOhm.
(New Thorlabs slim power sensor, model S130C)
422 power: A exit: 0.85 uW, B: 1.1 uW, C: 1.0 uW. Detuning at 185 MHz
461nm A-beam 195 uW
405nm A-beam adjust to 3 mW
repumper 13.5 mW (repeat 12mW) at ASE beam output
clearout 65 uW (seems low?)
(AW paper notebook clearout values: 75 uW on 2019-12-04, 77uW on 2019-11-25, 78uW on 2019-11-04)

New Kubuntu linux install

2021-01-19

Installed new OS on new disk. Migrated all software.
Artiq version now: v5.7144.9ed8f663. Conda enviroment: artiq-ion-v5-6.
Ionclock ARTIQ now ident 5.7144.9ed8f663;mikes (autogenerated by M-Labs).
New drift-DDS ARTIQ now ident 5.7144.9ed8f663;mikes-drift (built manually).
Drift-DDS ARTIQ seems to work. Configured for external ref for both Kasli and Urukul.

2021-01-16

(slight improvement with lid-adjustment and heatsink)

2021-01-14 Thursday

13:50Z add a heatsink to the alu end-plate
13:34Z improve slightly contact between antenna-lid and end-alumount. No visible reduction in monitor-voltage when loosening lid M3 screws (impedance matching still ok?)

With added clamping, resonator heating is reduced 140 -> 120 mK. RF-feedthru heating ~few mK lower.
(note the new year 2021 AD...)

2021-01-13 Wednesday

Install 2pcs hose-clamps that push the Cu-resonator into contact with the Alu-mounts
12:13Z install clamps to breadboard on both sides of Alu helres-mounts

Heating of the RF-feedthrough flange (10Vpp from signal-gen, 6+ hours settling time):

Old mount, no sink	120 mK
Old mount, Cu bars as heat-sink	85 mK
New mount, 2 mounts clamped	66 mK
New mount, mounts clamped, 2 hose-clamps around cu-helres	66 - ~few mK (results 2021-01-14!)

Results with two alu-mounts clamped to breadboard, and no clamping-force between cu-resonator and alu-mounts.

2021-01-11 Monday

Install new alu-mounts that imrpvoe heat-ocnduction from Cu-resonator to breadboard

11:26Z remove temporary copper heatsinks from helres

2021-01-08

(TLi) New vented rf shield (0.1 mm copper) with 6-mm slots top and bottom:
ca 12Z move Pt100 ch. 6 (106) from rf shield to helical resonator cylinder, above adapter piece.

With old shield:
Signal generator (Vpp) Monitor (mVpp, average 32)
10 66.4 (without averaging ca 70)
9 59.5
8 53.5
7 47.0
6 40.2

rf off.
New shield installed. RigExpert: min SWR 1.02 @ 14.4245 MHz, R = 52.1 Ohm, Q ~ 870 (SWR 2) ... 810 (SWR 3).

rf on.
Signal generator (Vpp) Monitor (mVpp, average 32)
8 53.1
10 66.8

Both Q and monitor ratio as before within uncertianty.

ca 13Z ready

2021-01-07

14:15Z RF OFF. will cool down by midnight, when computer turns ON.

RF siggen to 10Vpp, turn ON for testing
Menlo comb
lab lights (partially)
ca 09Z Turn on stuff after x-mas break

---

For 2020 results see index_2020

---

For 2019 results see index_2019