2022/08/30 (Tuesday)
- 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) Lead/poly shield fully assembled. Boron-filled socks covering NaI detectors. PuBe behind lead wall on West side of lead/poly shield. |
| Cooled to base yesterday after third 5K pumpout. | |
| 1135 | Temperature spikes returned on schedule at around 4:50 am. For a while MC base was around 28.9 mK with spikes peaking mostly below 29.5 mK but occasional ones as high as 31 mK. Between 10 and 11 am there was a sort of wandering diversion up to around 32 mK then back down. |
| 1140 | MC/Coldplate = 29.5/150 mK, Still = 1.10K / 0.080 mbar / 0 mW, G1/G2 = 156/146 mbar, 1K Pot = 60° / 1.60 K / 15±1 mbar, MB = 70.3 % |
| 1140 | Phonon channels look good though some baselines are slightly lower than yesterday. |
| 1400 | Spent a couple of hours trying to get NaI triggers back reading on DCRC4. Enabling DCRC4 kept locking up MIDAS. Kept swapping to DCRC6 and trying different POE cables. Finally got it working in the original configuration. NOTE: signals are visible in DCRC4pA even when Polarity is set to 0. |
| 1700 | Count NaI triggers to estimate a rate. 3 pulses in 100 3.2768 ms traces → 9±5 Hz. |
| 1700 | MC base = 29.2 mK, with spikes. |
| 1709 | Dial HV up to -109.25V nominal, -107.3V actual, for 15% prebias (using RootSequencer) |
| 1715 | Dial HV down to -95V nominal, -93.0V actual |
| 1720 | Phonon channels look ok, although I had to reset offset on DCRC3pA |
| 1720 | HV = -93 V, Vtest = -17.5 mV, Ileak = -19.2 uA, Vdet = -85.3 V (92%). |
| NOTE: DCRC4 is enabled now. It hasn't been enabled in recent data. So we are back to recording NaI triggers. | |
| 1724 | Start -85.3 V PuBe data series 60 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 1825 | HV = -92.9 V, Vtest = -17.5 mV, Ileak = -19.3 uA, Vdet = -85.2 V (92%). |
| 1829 | Start -85.2 V PuBe data series 112 min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pA threshold 20. Start series with the Start Button |
| 2025 | TowerFE crashed during Dump 113. Caught it pretty soon so not many empty dumps. |
| 2030 | HV = -92.9 V, Vtest = -18 mV, Ileak = -19.8 uA, Vdet = -85 V (91%). |
| 2033 | Start -85.0 V PuBe data series 44 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 2118 | Start -84.8 V PuBe data series 723 min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pA threshold 20. Start series with the Start Button |
| 1920 | HV = -92.9 V, Vtest = -18.4 mV, Ileak = -20.2 uA, Vdet = -84.8 V (91%). |
next morning:
| 0935 | TowerFE crash. Dumps after 723 are empty. |
|---|---|
| 0935 | HV = -92.9 V, Vtest = -20.3 mV, Ileak = -22.3 uA, Vdet = -84 V (90%). |