| | 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) |
| | overnight: base temperature stable, 1K Pot drifting down but very slowly |
| 1000 | Tower = 30.0 mK, G1/G2 = 93/104 mbar, Still = 0.080 mbar / 1.5 mW, 1K Pot = 1.50 K / 4.0 mbar |
| 1153 | Tower/MC/Coldplate = 29.9/30.2/180 mK, Still = 1.4 K / 0.080 mbar / 1.5 mW, G1/G2 = 92/103 mbar, 1K Pot = 1.45 K / 4.0 mbar. MB = 41.4% |
| 1215 | Start LHe transfer (MB = 41.0%) |
| 1220 | Fill LN2 cold trap full. |
| 1250 | Check on channels via SQUID tuning gui. All seem to be in range and operating. The flash and take sequence used yesterday was modified to never switch off the HV power supply, but just dialled its bias down to ~0 V. This seems to have kept channels from railing and should be the way to operate from here on out. |
| 1303 | End LHe transfer (MB = 89.7%) |
| 1306 | Tweak 1K Pot needle valve open about 10 degrees. 1K Pot → 1.63 K / 32 mK |
| 1310 | Top off HPGe dewar from large N2 dewar. |
| 1316 | Start HV scan sequence of 30-minute background (+PuBe) data series at HV = 10,20,30,40,50,60,70,80 V, Driver Gains = 2x, QET biases = (280/260/305)/(135/290/300) uA, Front-End Gains = 10, 1000 initial randoms, trigger on DCRC3pB/C/D threshold = 8/16/16, flashing then waiting 30min after each series, 15% prebias for 5min, using sequencer script HVscan-10_20_30_40_50_60_70_80-15_5PreBias-30Flash-30wait-30data.msl |
| 1710 | Tower = 29.9 mK, G1/G2 = 126/128 mbar, Still = 0.080 mbar / 1.5 mW, 1K Pot = 1.45 K / 4.5 mbar |