2022/09/06 (Tuesday)
- Lab in-personnel: Giulia, Zach, 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. |
| NaI trigger window: 7.6-11.2 MeV | |
| Cooled to base 2 days ago after fourth 5K pumpout. | |
| 1020 | MC/Coldplate = 28.1/148 mK, Still = 1.12 K / 0.110 mbar / 0 mW, G1/G2 = 159/147 mbar, 1K Pot = 60° / 1.59 K / 15±1 mbar, MB = 30.1 % |
| 1035 | Fill LN2 cold trap bath |
| 1320 | Begin LHe transfer @ MB = 25.6% |
| 1405 | End LHe transfer @ 94.2% |
| 1500 | Look at phonon traces - looking good. All show good pulses at previous QET biases. Some already had baselines around -0.8V, others had to have their offsets adjusted. |
| To understand the NaI-coincident spectrum, let's take NaI-triggered data at different biases. Already have some at -85V. Let's do some 0V. | |
| 1510 | Start 0 V PuBe data series 62 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 1614 | Start 0 V PuBe data series 183 min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20. Start series with the Start Button |
| The series looks like it's going but I don't think any data is being written. The raw data disk, /data/cdms1, seems to be inaccessible. Abort MIDAS run. Looking later it seems to have worked, 183 dumps. |
|
| 1920 | Pulses look OK |
| 1930 | Pulses showing weird wiggles, maybe first sign of helium film problems. Some look wider than normal. The higher bias data we took for the ladder calibration had wide pulses… should check, maybe those were late in the pumpout-period and their were He problems we were unaware of. |
| 2020 | Baselines high, pulses weak |
| 2145 | Pulses super weak. |