2018/09/12 (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) 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V) / Ortec 575A(gain=10, shaping = 3us) → x10/x10 attenuator → DCRCX(4) DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | Took 133Ba data overnight at -80V. |
| 0900 | Tower/MC/Coldplate = 31.7/30.2/196 mK (cooling after a flash), Still = 1.0 mW / 1.8±0.1 K / 0.090 mbar, G1/G2 = 129/123 mbar, 1K Pot = 1.60 K / 18 mbar, Turbo on IVC = 0.86 nbar, MB = 38.1% |
| 0905 | Fill LN2 cold trap bath. |
| 0955 | MIDAS webpage has become unresponsive. 07180912_0916 has 36 dumps and counting. |
| 0957 | Restart MIDAS and DAQ programs. Sequence is stopped with an error. We'll ramp down the voltage and flash. |
| 1000 | Dial HV down to 0V using change_HV_80_to_0_DCRC2.msl |
| 1015 | Flash DCRCs 1,3 for 30 seconds |
| 1100 | Start 10 x 2hr Ba datasets at -80V split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-80×10-15_5PreBias-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = 10 NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Pos) / Ortec 575A(gain=10, shaping = 3us, Pos) → 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 |
| 1320 | Looks like DCRC1pB railed at around 12:24, and maybe other channels' baselines shifted around. Also at this time the Tower temperature rose a bit, from 31.7 mK to 32.2 mK. A bit odd… also G2 (3He pump outlet) pressure has gone up a little since that time, subtle effect, no other cryo symptoms. |
| 1600 | Start LHe transfer, Main Bath = 27.6% |
| 1610 | Hit Stop Immediately on sequencer, during its wait after a flash |
| 1700 | End LHe transfer, Main Bath = 93.2% |
| 1754 | Start 10 x 2hr Ba datasets at -80V split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-80×10-15_5PreBias-30Flash-30wait-2hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/260/305)/(140/280/295) uA, Front-End Gains = 10 NaI detector: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Pos) / Ortec 575A(gain=10, shaping = 3us, Pos) → 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 |