2019/08/04 (Sunday)
| 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 behind lead stack. | |
| 1043 | 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 |
| 1545 | Tower/MC/Coldplate = 39.2/30.4/201 mK, Still = 1.31 K / 0.095 mbar / 0 mW, G1/G2= 118/113 mbar, 1K Pot = 1.66 K / 34 mbar. MB= 59.3% |
| 1550 | Fill LN2 Coldtrap Bath actually, the Dewar ran out, bath is only half full. And purge gas has no pressure. No time today to fill the Dewar, we'll see how it goes with leakage. |
| 1740 | Looks like leakage is slightly higher than before, Vtest maxing around 10 mV instead of 8 mV |
| 1920 | Vtest peaked at about 11 mV during the last series |
| 2030 | Vtest peaked at about 12 mV during the last series |
| 2250 | Vtest peaked at about 12 mV again during the last series |