2022/09/29 (Thursday)
- 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 source in storage in PAN443. |
| NaI trigger window: 7.6-11.2 MeV | |
| Cooled to base two days ago after tenth 5K pumpout. | |
| 1500 | MC base 29.3 mK with most spikes peaking below 33 mK, some above 40 mK |
| 1505 | MC/Coldplate = 29.3/150 mK, Still = 1.12 K / 0.110 mbar / 0 mW, G1/G2 = 116/104 mbar, 1K Pot = 45° / 1.58 K / 12±1 mbar, MB = 65.0% |
| 1510 | Fill LN2 cold trap bath |
| 1510 | Phonon baselines are all around -0.796 V, very slightly up from yesterday |
| 1520 | Checking to see how low a threshold we can set. First looking at data it looks like Side2pC = DCRC1pA is the channel with lowest noise. Setting that threshold down to 3 gives all good pulses. Setting it to 2 there's a lot of noise triggers, but there are still plenty of pulses showing up in the right place. So that's probably roughly similar to the low threshold setting in Run68. |
| 1526 | Start 0 V bg data series ## min long, SiHV-triggered with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1649 | Dial HV up to -109.25V nominal, -107.2V actual, for 15% prebias (using RootSequencer) |
| 1626 | Dial HV down to -95V nominal, -93.0V actual |
| 1627 | HV = -93 V, Vtest = -21.7 mV, Ileak = -23.9 uA, Vdet = -83.4 V (90%). |
| 1628 | Start series with the Start Button |
| abort series because DCRC2 was enabled, let's disable it to keep data cleaner | |
| 1629 | Start -83.4 V bg data series ## min long, SiHV-triggered with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |