2022/07/05 (Tuesday)
- Lab in-personnel: Giulia, 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 source behind lead wall. NaI trigger window -t10760 -T15760 (7.6-11.2 MeV) |
| Taking NaI-triggered HV data overnight | |
| 0629 | Start -197.3 V PuBe data series 10 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 0630 | MC = 29.2 mK |
| 0635 | Pulses still look fine. |
| 0646 | Start -197.3 V PuBe data series 268 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 1100 | MC/Coldplate = 29.2/152 mK, Still = 1.08 K / 0.095 mbar / 0 mW, G1/G2 = 134/131 mbar, 1K Pot = 60° / 1.55 K / 8.0±0.5 mbar, MB = 36.2% |
| 1110 | Filled LN2 cold trap dewar. |
| 1112 | Vtest = -43 mV |
| 1115 | Check again the purge gas flow at the Vent port on the LN2 Dewar. Very low flow. Open valve more to restart flow. |
| 1120 | Vtest = -24 mV, better |
| 1235 | Check Vtest again - not very stable, seems to be around -100 mV. Check LN2 vent port - almost no flow, not because the valve is closed too much but because the Dewar has no pressure. Close the vent valve for now. |
| 1240 | Dial HV down to 0V |
| 1528 | Begin LHe transfer @ MB = 29.8% |
| 1600 | Realize that DCRC4 was disable all weekend, so data has no NaI triggers. |
| 1626 | End LHe transfer @ MB = 91.8% |