2022/07/04 (Monday)
- Lab in-personnel: Giulia
| 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 | |
| 0945 | MC = 29.1 mK |
| 0945 | Start -197.3 V PuBe data series 12 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 0950 | Pulses still look fine. |
| 0955 | Having trouble stopping the MIDAS run, annoying. It's hanging on Stop Run and modifying the RunInfo stuff on the ODB isn't helping. |
| Eventually the Tower_FE and Trigger_FE programs crashed then I could stop the run. Restarted the programs and, luckily, I can still start a MIDAS run. | |
| We'll do a test: take Si-triggered data while bringing HV back to 0V. | |
| 1000 | Start -197.3 V to 0 V PuBe data series 30 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1004 | Dial HV down to 0V. Rampdown starts at 10:04:17 and ends at 10:05:26. Then HV relaxes from -118 mV to -47 mV with a time constant around 2 minutes. |
| 1140 | Start 0 V PuBe data series 59 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1320 | MC/Coldplate = 29.0/152 mK, Still = 1.08 K / 0.095 mbar / 0 mW, G1/G2 = 131/125 mbar, 1K Pot = 60° / 1.55 K / 8.0±0.5 mbar, MB = 66.1% |
| 1330 | Filled LN2 cold trap dewar |
| 1331 | Dial HV up to -230 V using RootSequencer for prebias |
| 1345 | Vtest = -340 mV, high. If it was this high during last night's data, then the detector bias was much lower than -197.3 V - estimated V_detector only -48 V. |
| 1355 | Check again the purge gas flow at the Vent port on the LN2 Dewar. There was very little to no flow. Open valve just a bit more to restart flow |
| 1357 | Vtest = -100 mV, and still decreasing |
| 1402 | Vtest = -45 mV, better |
| 1422 | After increasing flow of purge gas a bit more, Vtest is down to about -10 mV. That means 98% of the HV is actually reaching the crystal. |
| 1435 | Relock DCRC3pD to get it back to standard baseline |
| 1437 | Start -197.3 V PuBe data series 6 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1444 | Start -197.3 V PuBe data series 91 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 1445 | MC = 29.2 mK |
| 1617 | Start -197.3 V PuBe data series 11 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 1620 | MC = 29.1 mK |
| 1630 | Start -197.3 V PuBe data series 4h31m long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 2102 | Start -197.3 V PuBe data series 8 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC3pD threshold 10 (Si-triggered). Start series with the Start Button. |
| 2111 | Start -197.3 V PuBe data series 552 dumps long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20 (NaI-triggered). Start series with the Start Button. |
| 2433 | DAQ crash of some sort, after this point all dumps are empty. Only the first 221 dumps are good. |