2018/08/29 (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: | no data taken overnight. |
| 0852 | Start 1 x 2hr 40 V background datasets each split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-40×1-15_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 |
| 1025 | MIDAS is taking data but nothing is being copied from /livedata to /byseries. Why? Stop sequence after finishing 9 10-minute series. |
| 1030 | Tower/MC/Coldplate = 30.3/29.3/- mK, Still = 1.3±0.1 K / 0.070 mbar, G1/G2 = 98/91 mbar, 1K Pot = 1.61 K / 20 mbar, Turbo on IVC = 1.0 nbar, MB = 36.9% |
| 1030 | run change_HV_40_to_0_DCRC2.msl |
| 1035 | Fill LN2 cold trap full. |
| 1035 | Flash DCRCs 1&3 for 30 seconds |
| 1040 | Kill then restart MIDAS. Turn on DAQ programs. On Messages can see that lazy logger is copying files. |
| 1125 | Reverse leads on HV power supply, we'll try -40V bias data. |
| 1127 | Start 1 x 2hr -40 V background datasets each split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-40×1-15_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 |
| 1140 | Leakage looks a bit worse than in positive bias. Now Vbias = -40.013 V, Vtest = -6.77 mV. Typically in +bias Vtest is less than 5 mV. |
| 1430 | Start LHe transfer @ MB = 31.2% |
| 1524 | End LHe transfer @ MB = 93.7% |
| 1605 | Bring PuBe source back into lab and place centered behind lead stack at West wall of lead/poly shield (usual place) |
| The -40V data seemed to have a slightly lower noise width than the 40V data so we'll try taking some data at negative polarity for a while. | |
| 1610 | Fill LN2 cold trap bath |
| 1614 | Start 7 x 2hr -40 V PuBe datasets each split into 10min subruns, with CDMS and NaI detectors running and DCRC2 as HV controller. Using sequence HVscan-40×1-15_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 |