2019/09/04 (Wednesday)
| 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. | |
| 0935 | 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 |
| 0936 | Fill LN2 cold trap bath |
| 0937 | Tower/MC/Coldplate = 39.4/30.9/202 mK, Still = 1.31 K/ 0.085 mbar / 0 mW, G1/G2= 108/97 mbar, 1K Pot = 1.61 K / 17 mbar. MB = 30.3% |
| 1241 | mhttpd has crashed, restart it. Sequencer resumes at the beginning of bias drifting, so we've been sitting at 180V for too long. Series 07190904_0943 is junk |
| 1423 | mhttpd crashed again, restart. Sequence resumes during HV ramp-down. |
| 1423 | Begin LHe Transfer MB = 22.0% |
| 1510 | End LHe Transfer MB = 90.5% |
| 1727 | Fill LN2 cold trap full. |