2018/10/03 (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 → 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 = 29.5 mK |
| 0926 | Tower/MC/Coldplate = 29.5/30.3/183 mK, Still = 0.0 mW / 1.4±0.1 K / 0.090 mbar, G1/G2 = 137/142 mbar, 1K Pot = 1.60 K / 17 mbar, Turbo on IVC = 0.74 nbar, MB = 69.1% |
| 0930 | Fill LN2 cold trap bath. |
| 1020 | After 10th 10-minute series in current data block, remove PuBe source from lab and take back to Kevin Booth in Tate. |
| 1625 | Remove 22Na source from safe and place inside shield at bottom of NW corner. |
| 1630 | Fill LN2 cold trap full. |
| 1727 | 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 |