2022/08/26 (Friday)
- Lab in-personnel: 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 behind lead wall on West side of lead/poly shield. |
| Cooled to base yesterday after a 5K pumpout | |
| 0840 | Temperature spikes returned around 4 am. Still pretty mild. MC base is around 29.0 mK with spikes peaking as high as 31.5 mK. |
| 0910 | Mini-IbIs on DCRC1pD. dP/dI = 1.0 uV @ QET bias = 229.0 uA |
| 0920 | Mini-IbIs on DCRC3pA. dP/dI = 1.0 uV @ QET bias = 196.2 uA |
| 0930 | Mini-IbIs on DCRC3pB. dP/dI = 1.0 uV @ QET bias = 194.0 uA |
| 0945 | Mini-IbIs on DCRC3pD. dP/dI = 1.0 uV @ QET bias = 209.0 uA |
| 1205 | Open LN2 Dewar Vent valve to establish flow to E-box purge |
| 1207 | Dial HV up to -7.68V nominal, -5.15V actual, for 20% prebias (using RootSequencer) |
| 1212 | Dial HV down to -6.4V nominal, -4.25V actual |
| 1219 | Start -4.0 V PuBe data series 82 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 1220 | HV = -4.25 V, Vtest = -0.62 mV → Vdetector = -3.98 V |
| 1225 | MC/Coldplate = 29.3/152 mK, Still = 1.10K / 0.085 mbar / 0 mW, G1/G2 = 172/160 mbar, 1K Pot = 60° / 1.63 K / 23±1 mbar, MB = 69.1 % |
| 1230 | Fill LN2 cold trap bath |
| 1340 | HV = -4.25 V, Vtest = -0.42 mV → Vdetector = -4.07 V |
| 1345 | Dial HV down to 0V |
| 1522 | Dial HV up to -27.6V nominal, -25.4V actual, for 15% prebias (using RootSequencer) |
| 1527 | Dial HV down to -24.0V nominal, -21.8V actual |
| 1535 | HV = -21.77 V, Vtest = -2.72 mV → Vdetector = -20.57 V |
| 1536 | Start -20.7 V PuBe data series 85 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 1540 | MC = 29.2 mK base (with spikes) |
| 1605 | HV = -21.77 V, Vtest = -2.38 mV → Vdetector = -20.72 V |
| 1705 | HV = -21.77 V, Vtest = -2.15 mV → Vdetector = -20.82 V |
| 1705 | Dial HV down to 0V |
| 1950 | Check phonon channels. Baselines may be slightly lower, by around 0.01 V - could be the beginning of a helium film? But they look ok. |
| 1954 | Dial HV up to -81.7V nominal, -79.4V actual, for 15% prebias (using RootSequencer) |
| 2001 | Dial HV down to -71.0V nominal, -68.8V actual |
| 2005 | HV = -68.8 V, Vtest = -9.2 mV → Vdetector = -64.8 V. Not bad leakage. |
| 2007 | Start -65.0 V PuBe data series 79 min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pB threshold 10. Start series with the Start Button |
| 2025 | HV = -68.8 V, Vtest = -8.65 mV → Vdetector = -65.0 V. |
| 2120 | HV = -68.8 V, Vtest = -8.29 mV → Vdetector = -65.1 V. |
| 2130 | Dial HV down to 0V |