2018/10/09 (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) 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: | Bkg -125V data overnight, tower = 29.7 mK |
| 1000 | Tower/MC/Coldplate = 29.6/30.3/181 mK, Still = 0.0 mW / 1.4±0.1 K / 0.085 mbar, G1/G2 = 118/113 mbar, 1K Pot = 1.59 K / 17 mbar, Turbo on IVC = 0.74 nbar, MB = 66.7% |
| 1005 | Fill LN2 cold trap bath. |
| 1012 | Remove 22Na from safe and place inside shield at north-west corner at the bottom of the shield. |
| 1045 | We'll do some trigger tests. Turn off triggering on DCRC3pB, so only triggering on DCRC3pC and DCRC3pD. |
| 1214 | At the end of the 8th series, set triggering to DCRC3pB/D (no pC) |
| 1443 | Start 8x2hr Na22 trigger-test 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 = (280/280/305)/(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 varies |
| 1516 | All DCRC3 channels are railed. Change offsets of DCRC3pB/C/D from 0.15/-0.25/0.10 → -0.10/-0.50/-0.15 |
| 1606 | At the end of the 7th series, set triggering to DCRC3pB/C (no pD) |
| 1710 | After flash, stop sequence. |
| 1715 | Start to fill LN2 cold trap, but dewar is quite low, seems like there may be just gas left. I'll use a bomb dewar to fill the LN2 now, so we can have the LN2 gas to purge the HV overnight. |
| 1730 | Fill LN2 cold trap full from 5L dewar. |
| 1736 | Start 2x1hr Na22 trigger-test 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 TriggerScan-125V-10_5PreBias-30Flash-30wait-1hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/280/305)/(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 DCRC3pB/C/D = (9/12/11), (11/14/13). 1 hour at each setting. |
| 2134 | Start 2x1hr Na22 trigger-test 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 TriggerScan-125V-10_5PreBias-30Flash-30wait-1hrData-10minSubRun.msl CDMS detector: Driver Gains = 2x, QET biases = (280/280/305)/(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 DCRC3pB/C/D = (9/12/11), (11/14/13). 1 hour at each setting. |