2018/09/22 (Saturday)
| 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: | PuBe HV-scan data overnight, tower = 29.5 mK |
| 1625 | Tower/MC/Coldplate = 29.8/32.2/188 mK, Still = 0.0 mW / 1.5±0.1 K / 0.095 mbar, G1/G2 = 131/120 mbar, 1K Pot = 1.60 K / 17 mbar, Turbo on IVC = 0.86 nbar, MB = 23.4% |
| 1630 | Fill LN2 cold trap. |
| 1635 | Start LHe transfer (MB = 23.2%) |
| 1740 | End LHe transfer (MB = 92.2%) |
| 2045 | The bias scan from yesterday indicates that the noise is optimized between -125 V and -225 V (see below). Let's take some PuBe data at -125 V and maybe it'll have a little lower threshold than the -80V data. |
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| Noise width in eVee for the negative bias scan data taken yesterday. HV settings have not been corrected for leakage current. | |
| 2117 | 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: 1.1kV → NaI B/C → Ortec 452(gain=5, shaping = 6 us, output=10V, Neg) / Ortec 575A(gain=10, shaping = 3us, Neg) → x10/x10 attenuator → DCRC4PB/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 |
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