2018/10/01 (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 → DCRC55(1)/DCRC50(3) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | PuBe -125V data overnight, tower = 30.8 mK |
| 0935 | Fill LN2 cold trap bath. |
| 1015 | Tower/MC/Coldplate = 30.4/30.8/188 mK, Still = 0.0 mW / 1.3±0.1 K / 0.090 mbar, G1/G2 = 173/153 mbar, 1K Pot = 1.60 K / 19 mbar, Turbo on IVC = 0.74 nbar, MB = 70.3% |
| 1558 | Start prebias scan sequence at HV = -125 V with 10,15,20,30% prebias for 5 min, 2hr data, split into 10 min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence preBiasScan-125V-10_15_20_30-5PreBias-DCRC2_250V-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = (10/10/10)/(10/15/10) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/C/D threshold = 7/10/9 |
| 1625 | Fill LN2 cold trap bath |