2018/09/30 (Sunday)
| 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) NaI detector: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/PA DCRC33(2) → kepco 1kV power supply → HV input |
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| status: | PuBe -125V data overnight, tower = 30.0 mK |
| 1500 | Tower/MC/Coldplate = 30.2/30.7/185 mK, Still = 0.0 mW / 1.4±0.1 K / 0.090 mbar, G1/G2 = 122/109 mbar, 1K Pot = 1.59 K / 18 mbar, Turbo on IVC = 0.74 nbar, MB = 28.5% |
| 1512 | Fill LN2 cold trap bath. |
| 1526 | Stop data during pause in order to start LHe transfer. |
| 1526 | Start LHe transfer (MB = 28.1%) |
| 1607 | Manually dial down voltage to near 0 V. |
| 1608 | Start 30 s flash. |
| 1635 | End LHe transfer (MB = 90.9%) |
| 1647 | Start 8x2hr PuBe 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: 1.1 kV (for real) → NaI B/C (dynodes terminated) → Ortec 452(Neg input, gain=2.5, shaping = 6 us, output=+10V)/ Ortec 575A(Neg input, gain=5, shaping = 3 us) → x10/x10 attenuator → DCRCX(4) PB/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 |
| 1745 | Looks like all 3 DCRC3 channels are railed… |
| 1750 | Adjust ADC offsets of DCRC3 pB/C/D from -0.15/-1.25/0.33 to -0.45/-1.55/0.03 |
| 1756 | pD is ok but pB and pC still railed. Adjust ADC offsets of DCRC3 pB/C from -0.45/-1.55 to -0.75/-1.85 |
| 1803 | pB still railed, pC a little high now. Adjust ADC offsets of DCRC3 pB/C from -0.75/-1.85 to -1.05/-1.75 |