This page: http://monitor.mikes.fi/ionclock/
Machines and IPs:
Strontium/linux .45.99 (strontium.ad.vtt.fi)
win .45.23 (ESPTE1M012-ioni.ad.vtt.fi)
kavi .45.190 (kavi.ad.vtt.fi)
News and notable results
2021-01-25: first ions trapped after x-mas break. Intensifier+PCO needed for beam-alignment
2021-01-22: new mu-shields delivered. inner and mid-shields installed and fit ok
2020-12-03: Initial measurement of repumper-shift: -2600 (C1) to -2900 Hz (C4)
2020-11-18: New Ion page for clock-run data
2020-11ID11338.png-04: clock run with new HelRes (now 14.424 MHz) and new B-beam direction, but only 800us probe
2020-09-24: Move 2019 results to index_2019
2020-09-24: Secular frequencies with tickler + photon-correlation
2020-09-23: new 14.404 MHz Magic-RF Helical-Resonator
2020-07-02: Fourier limited 4 Hz linewidth with 180ms probe-pulse. Night, no metro.
2020-06-11: Second clock run, OD2 with 4ms probe, only C1, C2 peaks.
2020-05-17: D5/2 lifetime, random-telegraph method with 405nm and fit
2020-04-24: First clock run! 2.5ms probe, stability 2e-13/sqrt(tau_s)
2020-04-01: trapping single ion again, after 405 laser broke
2020-01-31: Move comb-plots to comb
2020-01-15: For temperatures, see DAQ
2019-12-19: Micromotion map, 3D pictures
2019-11-29: Cavity mode number, Comb mode number. Cavity absolute frequency.
2019-11-08: -C2 Zeeman component linewidth estimate of 800 Hz.
2019-11-05: Zeeman peaks with B-shield (1.6 uT estimate).
2019-11-04: Now with first B-shield. Laminated plywood + metglas.
2019-07-12: Zeeman peaks in ambient (66uT estimate) B-field. First clock-spectrum!
2019-07-10: Initial clock-transition search...
2019-07-10: Page created.
2019-06-18: ion photo and secular frequencies
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?
17:07 start B-count logging (with B-beam)
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:
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
z lorentzian fit may not be very good?
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
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?
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)
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.
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
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
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
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%
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
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
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
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
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?)
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
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)
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
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.
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
Leave the RF siggen on/off program on
Clamp down helres trap-side
Trim 3mm off the helres-mount clamp
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
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?)
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%
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
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
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
-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
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]
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
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
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
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).
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.
Switch to OD2+OD3. Try to operate experiment remotely.
10:16Z Abort clock-run
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
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+.
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
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.
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.
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.
Adjust comb f0 lock. Restart drift-comp.
07:02Z Abort remaining runs. Drift-comp stopped working 2020-02-03 14:20Z.
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
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?
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
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
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.
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-
uMotions: A: 6% in 13s, B: 22% in 10s, C: 18% in 15s
ion still stored (now 8 days?)
Leave 100ms peak-search over night. 0.8 Hz step, 200Hz span, 251 pts/peak
A-beam, 18 dB Zatt., OD4, 100ms probe
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
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
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
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.
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)
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.
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
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.
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
16:27Z leave lab.
16:20Z start collision-monitor with 10ms gate, 65/3 bright/dark. DB tag '2021-01-29-run1'. NO clearout.
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.
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
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
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?
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)
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?)
-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.
(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
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
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
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?
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..
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
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
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
0.2649(2) 0 0
0 0.41962(14) 0
0 0 0.2713(2)
% current giving zero field
IO = [-4.4719 -1.0115 1.0309] mA
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)
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%
Leave NPL-algorithm running, 8x8x8 grid
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:
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?
Temperature rise with thermal compound between helical-resonator and alu-mount.
Adding thermal compound changed helres heating from 120 mK to 90 mK.
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
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)
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.
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
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.
(slight improvement with lid-adjustment and heatsink)
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...)
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
|Old mount, Cu bars as heat-sink
|New mount, 2 mounts clamped
|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.
Install new alu-mounts that imrpvoe heat-ocnduction from Cu-resonator to breadboard
11:26Z remove temporary copper heatsinks from helres
(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)
New shield installed. RigExpert: min SWR 1.02 @ 14.4245 MHz, R = 52.1 Ohm, Q ~ 870 (SWR 2) ... 810 (SWR 3).
Signal generator (Vpp) Monitor (mVpp, average 32)
Both Q and monitor ratio as before within uncertianty.
ca 13Z ready
14:15Z RF OFF. will cool down by midnight, when computer turns ON.
RF siggen to 10Vpp, turn ON for testing
lab lights (partially)
ca 09Z Turn on stuff after x-mas break
For 2020 results see index_2020
For 2019 results see index_2019