2022/02/12 (Saturday)
- Lab in-personnel: Zach, Michael
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board+extra_board/nothing → Side2-readout HVboard CONN1/2/3 → HV1/2 → DCRC55(1)/50(3) Lead shield in place. Am Source y = 0.03 mm |
| Testing Side2-readout HV board | |
| 0700 | Goldman = 40.4 mK. It's been a bit elevated since yesterday's transfer. |
| With the current setup, when I did the hot-Al-flash after the move, the temperature didn't go as high: 1.24 rather 1.28 K. And noise width wasn't as good, which may be due to some channels still having trapped flux. Let's do another hotter flash. | |
| 0700 | Turn on DCRC1 LEDs with rep rate reduced from 5000 to |
| 1055 | Goldman = 40.8 mK |
| 1055 | Set all QET biases to target dP/dI=1uV and adjust driver offsets so baselines ~ -0.9 V. |
| 1056 | Ramp HV up to 112.8V using RootSequencer for prebias |
| 1101 | After 5 minutes ramp HV down to 98.28 V |
| 1105 | Channels are showing breakdown noise - huh. |
| 1105 | Dial HV down to 0.0 V using RootSequencer |
| 1107 | Fill LN2 cold trap bath. |
| 1114 | Goldman/Tower/MC(H35)/Coldplate = 40.1/77.7/33.2/181 mK, Still = 1.34 K / 0.110 mbar / 0 mW, G1/G2= 220.6/254.4 mbar, 1K Pot = 1.59 K / 11±1 mbar, MB = 69.6% |
| 1230 | Zap SQUIDs |
| 1430 | Goldman = 40.2 mK |
| 1430 | Ramp HV up to 113.0V using RootSequencer for prebias |
| Choppy noise evident in DCRC1pA&pB | |
| 1436 | After 5 minutes ramp HV down to 98.36 V |
| Still seeing choppy noise. Guess I'll try some data anyway. | |
| 1439 | Start 98.36 V data series after 5 min 15% prebias, 44 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pB threshold 20. Start series with the Start Button. |
| Bias varied during run between 98.35 - 98.58 V | |
| By the end of the run the choppy noise seems to have disappeared. | |
| 1525 | Dial HV down to 0.0 V using RootSequencer |