2020/02/28 (Friday)
| 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, 0.03 mK/hour, 0.6 mK/day | |
| 0520 | 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 |
| 0525 | Tower = 52.3 mK |
| 0534 | Data starts |
| 0600 | Vtest = 4.9 mV. pulses on BatViewer look OK. |
| 1320 | Tower/MC/Coldplate = 52.6/34.2/195 mK, Still = 1.55±0.05 K/ 0.220 mbar / 0 mW, G1/G2= 346/317 mbar, 1K Pot = 2.17 K / 24 mbar. MB = 24.2% |
| 1320 | Fill LN2 cold trap bath |
| 1400 | Begin LHe transfer MB=24.2% |
| 1405 | Abort transfer, He leaking out connection from dewar side transfer stick extender |
| 1410 | Took off extender found O-ring had somehow fallen down extender tube, no idea how it got there. Had Mike get it out. Received new O-ring from Mike |
| 1425 | Restart LHe transfer, no leaking, appears the leak was due to the O-ring. MB=26.8% |
| 1500 | End LHe transfer, MB=91.0% |