2022/07/08 (Friday)
- 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) |
| 0825 | MC = 29.1 mK, HV = -197.3 V, Vtest = -31.8 mV |
| 0826 | Start -197.3 V PuBe data series 7 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 0833 | Start -197.3 V PuBe data series 160 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 1105 | LakeShore 372 Bridge was stuck and we had to reset it. Held down Escape and Enter simultaneously to get to reset mode. |
| 1110 | MC/Coldplate = 29.0/155 mK, Still = 1.13 K / 0.095 mbar / 0 mW, G1/G2 = 98/94 mbar, 1K Pot = 60° / 1.55 K / 8.0±0.5 mbar, MB = 66.4%. |
| 1110 | LN2 Dewar doesn't have enough pressure currently to fill the trap bath. |
| 1115 | Close LN2 vent valve, which will stop the purge gas flowing. We stopped the data series since this is likely to make HV leakage increase. We'll watch the leakage and see how long until it starts to go up. |
| 1145 | Vtest has not increased, currently -30.6 mV. |
| 1210 | Vtest starts to increase |
| 1244 | Vtest = -34.4 and increasing. |
| 1255 | Vtest = -36.0 and increasing. |
| 1255 | Filled LN2 cold trap bath. (Pressure in LN2 Dewar built up enough since 11:15.) |
| 1255 | Dial HV from -200V (nominal) down to 0V |
| 1330 | Build a new E-box purge bag with a cardboard front and plastic sheet around the cardboard and taped over the E-box circumference. |
| 1345 | Open LN2 vent valve to establish a tiny amount of purge flow. |
| 1518 | Start 0 V PuBe data series 44 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1603 | Dial HV up to -230V nominal |
| 1608 | Dial HV down to -200V nominal after 5 minutes prebias |
| 1610 | Vtest is settling around -33 mV. (Not much improvement with the new purge bag.) |
| 1610 | HV = -197.4 V true |
| 1618 | Start -197.4 V PuBe data series 14 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1632 | Start -197.4 V PuBe data series 634 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 1640 | HV = -197.36 V, Vtest = -30.9 mV, MC = 29.1 mK |
| 1900 | HV = -197.33 V, Vtest = -29.7 mV, MC = 29.1 mK |
| 2205 | HV = -197.30 V, Vtest = -29.8 mV, MC = 29.1 mK |
| 2207 | Start -197.3 V PuBe data series 9 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 2217 | Start -197.4 V PuBe data series 666 min long (only 127 good dumps, see below), with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 2425 | Tower_FE crashed during Dump 127, all dumps after that are empty. |