2020/10/11 (Sunday)
- Lab in-person: Zach
- Virtual partner: Michael
| Setup | Run 73. DIB 1/3/4 → Stripline 43/48/41 → pi-filters 1/2/3 → Cable 3/1/2 → nothing/nothing/accessory_interposer → HV_Conn 1/3/2 → HV 1/2 → DCRCX(4)/DCRC55(1)-master; DCRC33(2) → HV control. DCRCs on. Lead/poly shield erected (4 lead walls, 2 poly walls). |
|---|---|
| 1052 | MB = 33.6% |
| 1130 | Tower = 65.3 mK. |
| 1245 | Tower = 64.0 mK. Over last 90 minutes it has wandered over a range 63.8-65.4 mK. Not good. |
| 1335 | Tower = 63.7 mK. More stable at the moment. |
| 1450 | Zach body temperature = 97.9 F |
| 1510 | Zach arrives at lab. |
| 1515 | Tower/MC/Coldplate = 63.6/30.9/193 mK, Still = 1.47 K / 0.130 mbar / 0 mW, G1/G2= 220/226 mbar, 1K Pot = 1.63 K / 22±2 mbar. |
| 1530 | Begin LHe transfer @ MB = 26.9 % |
| 1534 | Swapped HV leads for negative bias. |
| 1542 | Filled LN2 cold trap dewar. |
| 1603 | Ended LHe transfer @ MB = 91.1 % |
| 1621 | MB = 90.6 % |
| 1623 | Zach leaves lab. |
| 2055 | Tower = 64.2 mK. Over the last hour it has swung between 63.5 and 64.5 mK. lame. |
| 2112 | Start a 60 min series at HV = -100V, drifting 0.0285 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,205, 255, 0)/(0, 295, 270, 295)uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 8 Use RootSequencer.c, function drift_sequence(100,0.0285) |
| 2112 | Tower = 65.2 mK |
| 2112 | Vtest = -2.8 mV shortly after drift begins. Drift appears to start at -106.2 V. 1.1% HV loss. |
| 2212 | Drift ends, no apparent lag. Vtest = -5.7 mV. HV at end of drift looks like -208.1 V, indicating 1.1% HV loss |
| 2212 | Tower = 63.9 mK, not too bad (lucky) |
| Drift rate was slightly too slow. |