2022/08/16 (Tuesday)
- Lab in-personnel: Matt, Giulia, Himangshu
| 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. |
| 0820 | MC = 28.6 mK |
| 0820 | Phonon channels look good with yesterday's QET bias settings, but all the baselines are different. Relocking doesn't change them. Adjust all offsets to get baselines near -0.80 V. This time I adjusted the offsets to the nearest 0.01. |
| 0827 | Dial HV up to 27.6 V nominal, -25.4 V actual for 15% prebias (using RootSequencer) |
| 0832 | Dial HV down to 24 V nominal, -21.7 V actual |
| 0835 | Phonon channels look good, baselines unchanged |
| 0835 | HV = -21.7 V, Vtest = -4.0 mV → Vdetector = -19.9 V |
| 0838 | Start -19.9 V PuBe data series 75 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 0945 | HV = -21.7 V, Vtest = -3.6 mV → Vdetector = -20.1 V |
| 1000 | Dial HV down to 0V |
| 1200 | MC/Coldplate = 28.7/150 mK, Still = 1.13 K / 0.120 mbar / 0 mW, G1/G2 = 158/144 mbar, 1K Pot = 50° / 1.62 K / 19±1 mbar, MB = 74.0% |
| 1205 | Fill LN2 cold trap bath |
| 1710 | Check phonon channels. All look good, all show pulses. Baselines are still ~ -0.8 V but maybe a little higher than before, and MC is a little warmer earlier, 28.8 mK (not much really). I don't want to take the time to redo mini-IbIs, will take data anyway |
| 1718 | Dial HV to -81.65 V nominal, -79.4 V true, for 15% prebias (using RootSequencer) |
| 1723 | Dial HV to -71 V nominal, -68.8 V true |
| 1730 | Check phonon channels, look OK, maybe slightly higher baselines. |
| 1730 | HV = -68.8 V, Vtest = -11.7 mV → Vdetector = -63.7 V |
| 1730 | Start -63.7 V PuBe data series 98 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 1750 | HV = -68.8, Vtest = -11.1 mV → Vdetector = -63.9 V |
| 1910 | HV = -68.8, Vtest = -9.9 mV → Vdetector = -64.4 V |
| 1915 | Dial HV down to 0V |