2019/07/04 (Thursday)
| 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 → DCRCX(4)/DCRC55(1) DCRC33(2) → 1kV power supply → HV input Three walls of the lead/poly shield are up. |
|---|---|
| 1140 | Fill LN2 cold trap from transfer dewar. |
| 1150 | Tower/MC/Coldplate = 38.5/28.7/198 mK, Still = 1.39 K / 0.18 mbar / 6 mW, G1/G2 = 194/190 mbar, 1K Pot = 1.615 K / 19 mbar. MB = 29.9% |
| 1303 | Begin LHe transfer MB = 28.2% |
| 1345 | Finish LHe transfer MB = 91.6% |
| Recent data suggests low-energy noise pulses are prevalent at times greater than 48 minutes into a series. Create a new sequence that only drifts the HV and takes data for 50 minutes instead of 86. |
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| 1718 | Start a sequence of 8 @ 50 min series at HV = 180→306V, rate 2.49V/min, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (490/400/495)/(420/480/450) uA, Front-End Gains = (2/2/3)/(5/5/5) 1000 BOR, 5Hz InRun randoms, trigger on DCRC1pD threshold = 3, baseline/sample length = 20/30 (standard 5/16),phonon pre-pulse 600 (standard is 500). Use sequence HVdrift_8X180V_2p49VPM_loopversion_prebias_10_2_dur_50min_flashDCRC_1_4.msl |