2019/08/17 (Saturday)
| 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). |
|---|---|
| Na-22 source in castle south of lead/poly shield. | |
| 1405 | Tower/MC/Coldplate = 39.1/30.5/200 mK, Still = 1.30 K/ 0.09 mbar / 0 mW, G1/G2= 108/111 mbar, 1K Pot = 1.63 K / 22 mbar. MB= 27.6% |
| 1410 | Fill LN2 cold trap bath. |
| 1417 | Begin and promptly end LHe transfer due to leakage in transfer rod. Will attempt again shortly. MB = 27.4%. |
| 1436 | Begin LHe transfer. There's still a leak at the connection between transfer tube pieces, not sure what's wrong with it. |
| 1450 | Remove Na-22 source from the castle near the fridge and return it to safe. |
| 1505 | End LHe transfer @ MB = 92.5% |
| Found that the small o-ring of the transfer stick was broken. We replaced it. | |
| 1524 | Start a sequence of 8 @ 50 min series at HV = 180→306V, rate 2.49V/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_2p49VPM_loopversion_prebias_10_2_dur_50min_flashDCRC_1_4.msl |