2019/08/21 (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). |
|---|---|
| No source present in lab | |
| 1055 | Tower/MC/Coldplate = 39.2/30.6/200 mK, Still = 1.29 K/ 0.090 mbar / 0 mW, G1/G2= 105/99 mbar, 1K Pot = 1.63 K / 20 mbar. MB= 33.5% |
| 1057 | Fill LN2 cold trap bath. |
| Let's take more data but try a still higher trigger threshold. | |
| 1059 | Start a sequence of 8 @ 50 min series at HV = 180→306V, rate 2.01V/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 = 8, 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_2p01VPM_loopversion_prebias_10_2_dur_50min_flashDCRC_1_4.msl |
| 1445 | Commence LHe transfer. MB=27.9%. We're in the middle of data series 3 (07190821_1440), so it will be bad. |
| 1535 | Cease LHe transfer. MB=88.8% |
| 1615 | Fill LN2 cold trap bath. |