2022/07/07 (Thursday)
- 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) |
| 0632 | 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. |
| 0635 | MC = 29.2 mK |
| 0639 | Start -197.3 V PuBe data series 3 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 0640 | Crap - discovered that DCRC4 is not enabled. I guess maybe it became disabled when Tower_FE crashed yesterday?? Hmm, according to ODB records, all series started yesterday had DCRC4 enabled. Good, then. |
| 0644 | Start -197.3 V PuBe data series 3 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| This time DCRC4 is enabled | |
| 1105 | MC/Coldplate = 29.1/152 mK, Still = 1.08 K / 0.095 mbar / 0 mW, G1/G2 = 133/128 mbar, 1K Pot = 60° / 1.55 K / 8.0±0.5 mbar, MB = 37.6%. |
| 1115 | Didn't take the Vtest before attempting(flow was also too low) the LN2 transfer, and right after that it was oscillating betwen -20mV and -40mV. |
| 1135 | Filled LN2 cold trap dewar. |
| 1145 | Vtest = -10 mV |
| 1147 | Dial HV down to 0V |
| 1539 | Begin LHe transfer @ MB = 31.4% |
| 1630 | End LHe transfer @ MB = 87.1% |
| 1643 | Start 0 V PuBe data series 27 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| Put extra tap around Ebox purge bag to try to close off gaps | |
| 1710 | Adjust LN2 Dewar port valve to get just a little flow of N2 gas for purge |
| 1720 | Dial HV from 0V up to -230V |
| 1725 | Dial HV from -230V down to -200V nominal. True HV = -197.3 V |
| 1727 | Vtest ~ -21 mV |
| 1730 | Found more big gaps in Ebox purge bag. Tape those up. |
| 1732 | Vtest ~ -30 mV |
| 1740 | Rig up wires so we can read Vtest with the Keithley meter, and monitor it with LabVIEW. |
| 1740 | Vtest = -33.3 mV. Ileak = -37 nA, Vdetector = -182.6 V (93%) |
| 1748 | 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. |
| 1758 | Start -197.3 V PuBe data series 229 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 1800 | MC = 28.7 mK |
| 2149 | Start -197.3 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. |
| 2205 | Start -197.3 V PuBe data series 611 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| Vtest was between ~-30 and -32 mV throughout series |