2022/11/18 (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 W side of fridge. NaI array trigger window = 4.73 - 5.13 MeV |
| Cooled to base yesterday after twenty-fourth 5K pumpout. MC temperature spikes began around 3:15 am | |
| 1105 | Start MIDAS on DCRC2 (running CentOS7). Start DAQ programs and SQUIDtuningGUI. Everything working so far! |
| 1105 | Relock several channels. Now their baselines are all near -0.8 V |
| 1120 | Test RootSequencer at /data/chocula/cdmssoft/scdmsdaq/MidasDAQ/online/scripts/rootsequencer to change HV through DCRC2. That works too! |
| 1300 | MC temperature has increased since starting the DAQ programs and adjusting the phonon channels - 28.2 mK → 30.5 mK |
| 1305 | Adjust phonon offsets to get all baselines near -0.800 V |
| 1306 | Dial HV up to -108.1V nominal, -107.0 V actual, for 15% prebias (using RootSequencer) |
| 1312 | Dial HV down to -94V nominal, -92.6V actual |
| 1314 | Step HV down to -93V nominal, -91.6V actual |
| 1316 | Step HV down to -92V nominal, -90.5V actual |
| 1320 | HV = -90.5 V, Vtest = -20.4 mV, Ileak = -22.4 uA, Vdet = -81.6 V (90%). |
| 1355 | DCRC1pA baseline = -0.790 V |
| 1355 | MC baseline = 30.1 mK |
| 1355 | HV = -90.4 V, Vtest = -20 mV, Ileak = -22 uA, Vdet = -81.6 V (90%). |
| We'll try some Run68-style data (SiHV-triggered with low threshold) and take NaI data with this new threshold window. | |
| 1404 | Start -81.6 V PuBe 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 |
| 1410 | Data seems to be writing correctly. MIDAS seems to be functioning. |
| 1435 | MC/Coldplate = 30.0/153 mK, Still = 1.12 K / 0.100 mbar / 0 mW, G1/G2 = 148/137 mbar, 1K Pot = 60° / 1.57 K / 9.0±1.0 mbar, MB = 65.2% |
| 1440 | Fill LN2 cold trap bath |
| 1850 | DCRC1pA baseline = -0.784 V |
| 1850 | Start -81.6 V PuBe 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 |
| 1850 | HV = -90.5 V, Vtest = -20.4 mV, Ileak = -22.4 uA, Vdet = -81.6 V (90%). |