2022/05/09 (Monday)
- Lab in-personnel: Matt
| Status | Run 76 in progress |
|---|---|
| Setup | Cables 2/3/1 → diverter/nothing/nothing → Side2-readout HV CONN 1/3/2 → HV 1(L)/2(R) → DCRC50(3)/DCRC55(1), DCRC33(2)→HV control, NaI trigger signal → DCRCX(4) |
| 1040 | Phonon channels look weird, so zap SQUIDs on DCRCs 1&3 |
| After ZAP MC cools back to base but then rises again, from 28.4 to 29.2 mK | |
| 1055 | Phonon channels still look weird, no pulses, DCRC3 channels have funny noise |
| 1055 | Stop DAQ programs, power down DCRCs 1&3. MC temperature falls. |
| 1140 | MC/Coldplate = 26.5/137 mK, Still = 1.03 K / 0.095 mbar / 0 mW, G1/G2 = 98/115 mbar, 1K Pot = 18° / 1.56 K / 9±1 mbar, MB =74.5% |
| MC, Coldplate, Still all significantly cooler with DCRCs off | |
| 1140 | Goldman = 55.0 mK @ 632 uV excitation |
| 1145 | Fill LN2 cold trap bath |
| 1215 | MC = 26.2 mK. Repower DCRC1&3, restart DAQ programs |
| 1220 | Zap DCRC1&3 SQUIDs |
| 1430 | Pulses look good. Most channels are back to near their old baselines, except on DCRC3pA I had to readjust the offset. |
| To better understand the calibration I've been comparing 0V data to HV data. Let's take more 0V data in the current setup. | |
| 1432 | Start 0 V data series 63 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10. Start series with the Start Button. |
| 1600 | Phonon channels in DCRC3 look screwy. Zap DCRC1&3 SQUIDs again. |
| 1610 | OK, pulses look OK again. |
| 1620 | As with the last zap the MC temperature peaked at 29.2 mK, then started cooling again. |
Something wrong with this data. Gain starts to fall off after 10 minutes, low amplitude noise shows up, trigger rate falls to nothing after 30 minutes or so.
This corresponds with the baselines all rising…