2022/09/13 (Tuesday)
- Lab in-personnel: Zach
| 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 behind lead wall on West side of lead/poly shield. |
| NaI trigger window: 7.6-11.2 MeV | |
| Cooled to base yesterday after, Sixth 5K pumpout. Taking -66V NaI-triggered data overnight | |
| Temperature spikes started at 5:25 am although they are very mild so far | |
| 0814 | Start -66.8 V PuBe data series 82 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 0830 | HV = -68.7 V, Vtest = -5.3 mV, Ileak = -5.8 uA, Vdet = -66.4 V (97%).. |
| 0830 | MC = 28.9 mK |
| 0940 | Dial HV down to 0V |
| 1415 | Fill LN2 cold trap bath |
| 1415 | MC/Coldplate = 31.6/150 mK, Still = 1.13 K / 0.075 mbar / 0 mW, G1/G2 = 135/131 mbar, 1K Pot = 45° / 1.59 K / 13±1 mbar, MB = 66.9% |
| 1422 | Swap HV leads to positive bias |
| 1425 | Dial HV to +100V nominal, 97.88V actual |
| 1430 | HV = 97.9 V, Vtest = 20.4 mV, Ileak = 22.4 uA, Vdet = 88.9 V (91%). |
| Leakage followed the expected exponential decay, but still is fairly high. | |
| Forgot about prebias, I'll do that now | |
| 1432 | Dial HV up to +115V nominal, -112.92V actual, for 15% prebias |
| 1437 | HV = 112.9 V, Vtest = 42.3 mV, Ileak = 46.6 uA, Vdet = 94.3 V (84%). |
| 1438 | Dial HV down to +100V nominal, 97.87V actual |
| 1443 | HV = 97.9 V, Vtest = 13.5 mV, Ileak = 14.8 uA, Vdet = 91.9 V (94%). |
| Leakage is a bit better now | |
| 1445 | Disable DCRC2, baseline elevated to -.27 on DCRC3 PA and PD |
| Adjust DCRC3 PA offset 0.87 → 1.12, baseline now ~ -0.79 | |
| Adjust DCRC3 PD offset 1.37 → 1.62, baseline now ~ -0.79 | |
| Pulses look good now | |
| 1457 | Start +97.9 V PuBe data series 45 min long, SiHV-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| I just noticed that the MC temp rose to 63 mK starting at 14:40 and is now back down at base 15min later, did what I was doing somehow cause this? | |
| There is also a drop in G1 and G2 at around 14:15 which corrected itself | |
| 1546 | Start +97.9 V PuBe data series 718 good min long, NaI-triggered, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC4pA threshold 20. Start series with the Start Button |
| Data started failing at 03:54 dump 718, file sizes low. |