2019/08/12 (Monday)
| 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 has been removed from lab. | |
| 0920 | Fill LN2 cold trap bath. |
| 0930 | Tower/MC/Coldplate = 38.9/30.2/197 mK, Still = 1.28 K/ 0.09 mbar / 0 mW, G1/G2= 107/107 mbar, 1K Pot = 1.636 K / 24 mbar. MB= 67.9% |
| 1025 | Write a new sequence to drift HV more slowly, 1.84 V/min. HVdrift_8X180V_1p84VPM_loopversion_prebias_10_2_dur_50min_flashDCRC_1_4.msl |
| 1424 | Start a sequence of 8 @ 50 min series at HV = 180→270V, rate 1.84V/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_1p84VPM_loopversion_prebias_10_2_dur_50min_flashDCRC_1_4.msl |
| Drift looks too slow, should increase to 2.01 V/min | |
| 1610 | Fill LN2 cold trap bath. |