2018/08/10 (Friday)

Previous Day

	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) → DCRCX(4) DCRC33(2) → kepco 1kV power supply → HV input
	status: Took SiHV+NaI PuBe data overnight. Vbias very close to 40 V, Vtest varied between 4-6 mV, so Vdetector = 37.6-38.4 V
0845	Tower/MC/Coldplate = 33.8/29.5/182 mK, Still = 1.3±0.1 K / 0.090 mbar, G1/G2 = 112/107 mbar, 1K Pot = 1.64 K / 32 mbar, Turbo on IVC = 1.0 nbar, MB = 18.9%
	overnight circulation and 1K Pot stable. Tower temperature overall fell about 0.7 mK overnight.
0855	Fill LN2 cold trap bath.
1030	Start LHe transfer @ MB = 16.5%
1150	End LHe transfer @ MB = 93.5%
1240	Dial HV up to 40V using change_HV_0_to_40_DCRC2.msl
1300	Adjust QET biases on DCRC3pC to try to avoid too much oscillation / after-peaks. At QET bias = 285, pulses above 0.4V had afterpeaks. Adjust to 280, it's a little better, afterpeaks at maybe >0.6 V. Do something similar for DCRC3pD, adjust QET bias too.
1305	Dial HV down to 0V using change_HV_40_to_0_DCRC2.msl
1315	Flash detector for 30 seconds
1458	Start 6 5 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-40×6-15_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) → DCRC4PB/PA, Driver Gains = 1/1, PhononWaveFormLength = 1024 (512 samples), PhononPrepulseSamples = 64 (64 samples) 1000 BOR randoms, trigger on DCRC3pB/D threshold = 7/9
1600	Fill LN2 cold trap bath. MB = 90.6%

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