2018/09/25 (Tuesday)
| 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) 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V) / Ortec 450(gain=5, shaping = 5 us integration, Neg input) → x10/x10 attenuator → DCRCX(4) DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | PuBe -125V data overnight, tower = 29.7 mK |
| 1115 | Tower/MC/Coldplate = 29.7/30.3/182 mK, Still = 0.0 mW / 1.2±0.1 K / 0.095 mbar, G1/G2 = 136/130 mbar, 1K Pot = 1.60 K / 19 mbar, Turbo on IVC = 0.86 nbar, MB = 70.6% |
| 1120 | Fill LN2 cold trap. |
| 1303 | Start 20 min NaI test series with NaI amplifiers swapped during cooldown period. NaI detector: 1.1kV → NaI B/C → Ortec 450(gain=5, shaping = 5 us integration, Neg input) / Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) → x10/x10 attenuator → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC4pA/B threshold = 5/5 |
| 1325 | Switch NaI amplifiers back to: NaI detector: 1.1kV → NaI B/C → Ortec 450(gain=5, shaping = 5 us integration, Neg input) / Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) → x10/x10 attenuator → DCRC4PB/PA before HV data taking resumes. |
| not noted at the time, but it seems that we must have removed the PuBe source from the lab at this time | |
| 1555 | Remove 22Na source from safe and place inside lead/poly shield at bottom of NW corner. |
| 1600 | Fill LN2 cold trap full. |
| 1628 | Start 8x2hr Na 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 = (280/260/305)/(140/280/295) uA, Front-End Gains = (10/10/10)/(10/15/10) NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 450(gain=5, shaping = 5 us integration, Neg input) → x10/x10 attenuator → DCRC4PB/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 |