2018/09/07 (Friday)
| 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 PuBe data overnight at -80V with PuBe source out of barrel. |
| 0850 | Tower/MC/Coldplate = 30.6/29.6/185 mK, Still = 1.3±0.1 K / 0.070 mbar, G1/G2 = 139/118 mbar, 1K Pot = 1.60 K / 19 mbar, Turbo on IVC = 1.0 nbar. MB = 76.0% |
| 0855 | Fill LN2 cold trap bath. |
| Current dataset will end at 9:30, so we'll put the PuBe back in the barrel at that time. | |
| 0932 | Put PuBe source back in paraffin barrel. We are currently between datasets of the sequence which began yesterday. |
| 0942 | Stop sequence, it's waiting after a flash. We'll start up again later. Planning to remove source to take bg data and gamma calibration data |
| 1020 | Remove PuBe source from lab. |
| 1031 | Turn on 80V bias using sequence changeHV_0_to_80_preBias_15_5_DCRC2.msl |
| 1045 | Measure a background rate of 37 Hz using DCRC1pA. |
| 1047 | Remove 133Ba source from safe and place at top of mu-metal shield on West side of fridge. Measure a rate of 56 Hz using DCRC1pA. |
| 1052 | Push 133Ba source down to detector level between mu metal shield and cryostat. Rate>~300 Hz. |
| 1052 | Move 133Ba source to 4 inches below top of mu metal shield. Measure a rate of 56 Hz using DCRC1pA. |
| 1102 | Start data - mistake, didn't break it into 10 min subruns |
| 1104 | Start data - mistake, still had long tracelengths on DCRC1. Fixed this. |
| 1110 | Start 1 x 2hr 133Ba dataset at -80V split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence timed_subrun.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/D threshold = 7/9 |
| 1320 | Dial HV from -80V to 0V using change_HV_80_to_0_DCRC2.msl |
| 1325 | Flash LEDs on DCRCs 1,3 for 30 seconds |
| 1442 | Start 10 x 2hr 133Ba datasets (actually 1 Ba, the rest bg) 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/D threshold = 7/9 |
| 1645 | Fill LN2 cold trap bath |
| 1655 | Remove 133Ba source from fridge, return to safe. Will continue to take -80V background data. |
| 2010 | MIDAS seems to have crashed. No dataset started after the flash around 1655, the bias is still at 0V. |
| 2015 | Restart MIDAS and the DAQ programs. Sequence restarts. Voltage is ramping up. |