2018/10/06 (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 → 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: | Na22 -125V data overnight, tower = 29.6 mK |
| 1535 | Tower/MC/Coldplate = 29.7/30.3/187 mK, Still = 0.0 mW / 1.4±0.1 K / 0.085 mbar, G1/G2 = 114/103 mbar, 1K Pot = 1.59 K / 15 mbar, Turbo on IVC = 0.74 nbar, MB = 26.6% |
| 1540 | Start LHe transfer (MB = 26.6%) |
| 1630 | End LHe transfer (MB = 95.6%) |
| 1635 | Fill LN2 cold trap bath. |
| 1644 | Start 8x2hr 22Na series at HV = -125 V with 15% prebias for 5 min, split into 10 min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-125×8-15_5PreBias-DCRC2_250V-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/280/305)/(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 |
| 1758 | Two channels railed low: DCRC1pB and DCRC3pC. Change their Driver Offsets: -0.13/0.05 → -0.43/-0.25 This seems to have worked. |