2022/02/04 (Friday)
- Lab in-personnel: Matt and Giulia
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board+extra_board/nothing → HVboard CONN1/2/3 → HV1/2 → DCRC55(1)/50(3) Lead shield in place. Am Source y = 0.03 mm |
| 1010 | Goldman/Tower/MC(H35)/Coldplate = 40.9/71.0/36.7/179 mK, Still = 1.37 K / 0.110 mbar / 0 mW, G1/G2= 264/235 mbar, 1K Pot = 1.57 K / 11±1 mbar, MB = 70.8% |
| 1015 | Fill LN2 cold trap bath. |
| 1045 | Goldman = 40.8 mK. Set QET biases to target dP/dI=1.0 uV. Didn't have to adjust driver offsets, baselines ~ -0.9 V |
| 1224 | Ramp HV up to 112.6V using RootSequencer. This is prebias |
| 1229 | After 5 minutes ramp HV down to 98.08 V |
| 1232 | Start 98.08 V data series after 5 min 15% prebias, 39 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pC threshold 20. Start series with the Start Button. |
| 1315 | After stopping series dial HV down to 0.0 V using RootSequencer |
| Note: I've been ramping the HV in qI steps of 0.04 with 210 ms pauses, which is about 5V/s. (Although OmniLogger makes it look more like 3V/s.) |
Some analysis notes:
- 20V data: noise width 22 eV with unmodified OF, 18.7 eV with OF linearized wrt INT
- 100V data: noise width 19.2 eV with unmodified OF, 11.8 eV with OF linearized wrt INT
- 150V data: noise width 61 eV with unmodified OF, 16.9 eV with OF linearized wrt INT
- 100V data with prebias: noise width 8.1 eV with OF linearized wrt INT
| Now we'll try moving the source over pC to see whether we measure better noise width. | |
| 1605 | Double-click Arduino Bridge link on desktop. Establish communication with the Arduino. Temperature spike as usual when doing this remotely. |
| 1610 | Set Dwell to 40 ms |
| 1614 | Do mvNwait -4steps×455 times, 40 second wait, with dwell = 40 and power = 6.8 V. (Around 5.93 mm/hour) This sequence will take 5hr3min20sec and will move the source a total distance of 30.00 mm ending at y = 30.03 mm. Should end at 9:17 pm. Tower temperature averages around 0.52 K with familiar oscillations. |
| 2200 | Goldman = 57 mK and cooling |
| 2205 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to 500. Turn off LEDs after 3 minutes. Goldman peaked at 1.28 K. |