2022/07/11 (Monday)
- Lab in-personnel: Matt, Giulia, Zach, Derek
| 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 source behind lead wall. NaI trigger window -t10760 -T15760 (7.6-11.2 MeV) |
| Taking 0V NaI-triggered data continuously | |
| 0828 | Start 0 V PuBe data series 86 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1045 | MC/Coldplate = 29.0/155 mK, Still = 1.12 K / 0.095 mbar / 0 mW, G1/G2 = 109/114 mbar, 1K Pot = 60° / 1.55 K / 8.0±0.5 mbar, MB = 37.1% |
| 1055 | Filled LN2 cold trap bath |
| 1345 | Open LN2 Vent valve to establish a tiny amount of flow for the E-box purge |
| 1348 | Dial HV from 0V to -200V nominal with RootSequencer |
| 1357 | After 7 minutes dial HV from -230V to -200V nominal |
| 1400 | Vtest ~ -160 mV, still settling a little but quite high |
| 1400 | Open LN2 Vent valve further, significantly higher flow. Vtest starts falling immediately. |
| 1405 | Vtest ~ -50 mV and settling |
| 1410 | Vtest ~ -40 mV and settling |
| 1430 | Vtest ~ -31 mV and pretty flat |
| 1440 | Vent valve is cold and frosting up. Definitely too much flow. Reduce flow now to a trickle. |
| 1440 | Vtest ~ -30 mV. Looks like that's the best we can do. |
| 1530 | Begin LHe transfer @ MB = 30.9% |
| 1616 | End LHe transfer @ MB = 95.6% |
| 1646 | HV = -197.34 V, Vtest = -30.3 mV, MC = 28.8 mK |
| 1649 | Start -197.3 V PuBe data series 20 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1705 | HV = -197.36 V, Vtest = -30.6 mV, MC = 28.7 mK |
| 1709 | Start -197.3 V PuBe data series 1022 min (17 hours) long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| For most of the series Vtest was increasing, from -30V to -36V. For the last ~80 minutes it fell a bit, from -36V to -34V. |