2022/11/24 (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 behind lead wall on W side of fridge. NaI array trigger window = 4.73 - 5.13 MeV |
| Cooled to base yesterday after twenty-sixth 5K pumpout. Temperature spikes began at 3:05 am. | |
| 1040 | Adjust phonon offsets to get all baselines near -0.800 V |
| 1050 | Dial HV up to -11.5V nominal, -9.65V actual, for 20% prebias (using RootSequencer) |
| 1056 | Dial HV down to -10.0V nominal, -8.31V actual |
| 1100 | HV = -8.3 V, Vtest = -0.3 mV, Ileak = -0.3 uA, Vdet = -8.2 V (99%). |
| 1105 | Test sequencer on browser interface to take data. It doesn't seem to work. Sequencer immediately says “sequence is finished”, it starts a run but doesn't update the ODB (it's supposed to turn on the logger) and it doesn't do the WAIT step. |
| I'm taking low-threshold SiHV-triggered data, idea is to do another ladder calibration but with lower trigger thresholds. | |
| 1108 | Start -8.2 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| Bad data, something wrong with DCRC1pA | |
| 1207 | Dial HV up to -20.7V nominal, -19.01V actual, for 20% prebias (using RootSequencer) |
| 1213 | Dial HV down to -18.0V nominal, -16.4V actual |
| 1220 | HV = -16.4 V, Vtest = -0.4 mV, Ileak = -0.5 uA, Vdet = -16.3 V (99%). |
| 1220 | Start -16.3 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1225 | Abort series because DCRC1pA baseline is way off and pulses look kinda weak. Tried relocking, didn't help. |
| 1225 | Dial HV down to 0V |
| 1335 | DCRC1pA is good now. I was working out how to do SQUID zapping manually… in the process I tried the ZAP tool in the DCRC_UI again, and at one point I noticed that SQUID bias and QET bias for DCRC1pA had been set to 0 - which is something the ZAP sequence should do. So I guess it partially worked? After looking up the correct values in an old ODB log I reset them, and now DCRC1pA looks fine. Not sure when it went bad, possibly the first data from today was bad. |
| Check BatViewer - DCRC1pA was messed up for all data taken today. | |
| 1350 | Notice that all baselines are down around -0.814 V now. Maybe something messed up in the SQUIDs was heating the QETs before. |
| 1355 | Adjust phonon offsets to get all baselines near -0.800 V |
| 1356 | Dial HV up to -11.5V nominal, -9.73V actual, for 20% prebias (using RootSequencer) |
| 1402 | Dial HV down to -10.0V nominal, -8.38V actual |
| 1405 | HV = -8.4 V, Vtest = -0.2 mV, Ileak = -0.2 uA, Vdet = -8.3 V (99%). |
| 1408 | Start -8.3 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1410 | DCRC1pA baseline = -0.798 V |
| 1551 | Dial HV up to -20.7V nominal, -19.0V actual, for 20% prebias (using RootSequencer) |
| 1555 | Fill LN2 cold trap bath |
| 1555 | MC/Coldplate = 31.9/149 mK, Still = 1.03 K / 0.060 mbar / 0 mW, G1/G2 = 113/104 mbar, 1K Pot = 45° / 1.57 K / 8.5±0.5 mbar, MB = 64.9% |
| 1557 | Dial HV down to -18.0V nominal, -16.5V actual |
| 1600 | HV = -16.5 V, Vtest = -0.4 mV, Ileak = -0.4 uA, Vdet = -16.3 V (99%). |
| 1603 | Start -16.3 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1605 | DCRC1pA baseline = -0.802 V |
| 1730 | DCRC1pA baseline = -0.799 V |
| 1732 | Dial HV up to -30.0V nominal, -28.4V actual, for 20% prebias (using RootSequencer) |
| 1739 | Dial HV down to -26.0V nominal, -24.3V actual |
| 1745 | HV = -24.3 V, Vtest = -0.6 mV, Ileak = -0.6 uA, Vdet = -24 V (99%). |
| 1748 | Start -24.0 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 1750 | DCRC1pA baseline = -0.799 V |
| 2006 | Dial HV up to -41.4V nominal, -39.8V actual, for 20% prebias (using RootSequencer) |
| 2012 | Dial HV down to -36.0V nominal, -34.4V actual |
| 2020 | HV = -34.3 V, Vtest = -1 mV, Ileak = -1 uA, Vdet = -33.9 V (99%). |
| 2022 | Start -33.9 V PuBe data series ## min long, with 1000 initial randoms, 5 Hz in-run randoms, trigger on DCRC1pA threshold 2. Start series with the Start Button |
| 2025 | DCRC1pA baseline = -0.792 V |
| 2200 | Can't connect remotely to the fridge computer, don't know what's up. Can connect to the DAQ but it's slower. |
| 2210 | DCRC1pA baseline = -0.793 V |
| 2020 | |
| We'll take overnight data just to watch for when the phonon channels go bad. | |
| 2331 | Start Start series with the Start Button |