2018/09/04 (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 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. |
| 0829 | DCRC3pC's baseline is too high, saturates for strong pulses. Adjust driver offset -1.5 → -1.2. |
| 0830 | Tower/MC/Coldplate = 30.7/29.6/185 mK, Still = 1.4±0.1 K / 0.070 mbar, G1/G2 = 137/127 mbar, 1K Pot = 1.61 K / 20 mbar, Turbo on IVC = 1.0 nbar. MB = 32.9% |
| 0835 | Fill LN2 cold trap bath. |
| 1125 | DAQ seems stuck somehow: series 07180904_0944 keeps going, 92 dumps, should have ended at 10 dumps. MIDAS web page is unresponsive. So, kill MIDAS and restart it. Then restart programs |
| 1130 | After restart, the sequence is no longer running and there's no data run in progress. Bias is still at -80V. |
| 1135 | Dial HV to zero, use a new sequence script to do this: change_HV_80_to_0_DCRC2.msl |
| 1143 | Flash DCRC1,3 for 30 seconds |
| 1220 | Start LHe transfer (MB = 27.0%) |
| 1317 | End LHe transfer (MB = 92.1%) |
| 1335 | Start 10 x 2hr PuBe 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/D threshold = 7/9 |
| 1413 | two railed channels. DCRC1pB, change ADC offset -1.5→-1.75. DCRC3pC, change ADC offset -1.2→-1.5. |
| 1455 | Network failed, causing MIDAS to crash. Bias still on. Restart MIDAS and DAQ programs. Sequence starts back up close to beginning of 6th/12 series. That's about 20 minutes later than it should have started, so this data set will run about 2hr20min without flash. |
| 1639 | Fill LN2 cold trap full. |