2020/02/27 (Thursday)
| Setup | Run 72. DIB 1/3/4 → Stripline 43/41/48 → Cable 3/2/1 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1). DCRCs on overnight. No shield. |
|---|---|
| overnight: tower temperature falling at constant rate, 0.05 mK/hour, 1.1 mK/day | |
| 0910 | Tower/MC/Coldplate = 53.5/33.1/198 mK, Still = 1.55±0.05 K/ 0.200 mbar / 0 mW, G1/G2= 331/302 mbar, 1K Pot = 2.14 K / 24 mbar. MB = 68.3% |
| 0910 | Fill LN2 cold trap bath |
| 1830 | Reconnected the Kepco HV by putting the black lead back into the -. |
| 1915 | Start a series at HV = 300→452V, rate 46mV/s, 55 minutes, with 10% prebias for 2 minutes, flash at end with 30 min wait. CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (na/360/430)/(360/420/440) uA, Front-End Gains = (na/3/3)/(5/5/5) 1000 BOR and 5Hz in-run randoms, trigger on DCRC1pD threshold = 9 Use sequence HVdrift_250V_45mVps_pre10-2_60min.msl |
| 1915 | Tower = 52.5 mK |
| 1929 | Data starts |
| 1935 | Vtest = 4.5 mV. pulses on BatViewer look OK. |
| Vtest looks a lot more stable today than it did before. | |
| 2000 | Vtest = 5.0 mV. pulses on BatViewer look OK. |