2019/08/30 (Friday)
| Setup | DIB1/3/4 → 3.2 MHz filters 2/3/1 → cable 3/1/2 → gender changer ?/3/2 → HVConn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1) DCRC33(2) → 1kV power supply → HV input NaI B → DCRC50(3) pB Lead/poly shield erected, south wall partial lead only (with NaI detectors). |
|---|---|
| PuBe source in lab. | |
| 0933 | Fill LN2 cold trap bath. |
| 1000 | Tower/MC/Coldplate = 39.7/31.0/200 mK, Still = 1.27 K/ 0.085 mbar / 0 mW, G1/G2= 106/96 mbar, 1K Pot = 1.62 K / 19 mbar. MB= 68.7% |
| 1006 | PB looks in the DQ PSDs. Yep, it is partially railed. I hope this hasn't been going on for long, it wasn't super super obvious in the individual channel DQ plot since it was still showing some signs of life, but the PB PSD was flat. Damn, it looks like this has been the case since Monday (07190826_1144). |
| 1011 | Start a sequence of 8 @ 34 min series at HV = 180→327V, rate 4.31V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pD threshold = 6, baseline/sample length = 120/28 (standard 16/5), phonon pre-pulse 500 (standard is 500). NaI detector: 800 V → NaI B (dynode terminated) → PS776 → Lecroy 628 Fan In/Out → Ortec 452(Neg input, G=100, shaping=6us, -10V output) → DCRC3 PB, Driver Gains = 1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 512 (512 samples) Use sequence HVdrift_8X180V_4p31VPM_loopversion_prebias_10_2_dur_34min_flashDCRC_1_4.msl |
| 1642 | Fill LN2 cold trap full. |
| 1644 | mhttpd has crashed again. HV was in the middle of ramping up. Whatever series this will be is junk. Run start_daq_umn.sh to fix it. |
| 1650 | Dang, it crashed again already! Restart and stop the sequence. |
| 1652 | Dial down HV. Flash detector. Kill and restart MIDAS. Try repeatedly to flash using flashandflash gui, only to get “problem in toolstimeout” error every time. Looks like the tool is producing empty testflash.msl sequences for some reason. |
| 1705 | Restart MIDAS again. Problem persists. Flash manually by turning on 15V power and LEDs on DCRCs 1,4 in ODB for ~30s. |
| 1737 | Start another series. Later realized that the sequence again got stuck before taking good data. |