2020/08/26 (Wednesday)
- Lab in-person: Zach
- Virtual partner: Derek
| 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 overnight. Lead/poly shield erected (4 lead walls, 2 poly walls). |
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| 0658 | MB = 30.0% note: this is actually 05:58. The camera got out of sync with the updating of the meter display. Should probably start the camera 30 seconds or so after resetting the meter. |
| 0720 | Tower = 52.7 mK |
| 0727 | Start a 15 min series at HV = +150V, drifting 0.0350 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,320,370,0)/(0,360,420,410)uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 12 Use sequence HVdrift_pos150V_pre15_2min_35p0mVps_multiloop10_15min.msl |
| 0727 | Vtest = 8.3 mV shortly after drift begins. Drift appears to start at +153.1 V. 2.2% HV loss. |
| 0743 | Vtest = 9.1 mV, HV = 184.3 V, drift ends. 2.0% HV loss. Lag ratio = 1.1ish. |
| 0743 | Tower = 52.6 mK |
| 0845 | Tower = 53.0 mK |
| 0855 | Start a 60 min series at HV = +150V, drifting 0.0349 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,320,370,0)/(0,360,420,410)uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 12 Use sequence HVdrift_pos150V_pre15_2min_34p9mVps_multiloop10_60min.msl |
| 0855 | Vtest = 7.6 mV shortly after drift begins. Drift appears to start at +153.1 V. 2.0% HV loss. |
| 1001 | Vtest = 13.2 mV, HV = 277.7 V, drift ends. 1.9% HV loss. Lag ratio = 1.1. |
| 1001 | Tower = 52.8 mK |
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| Pumping the cryostat vacuum jacket has definitely slowed the boiloff rate. It looks like it may be as slow at the end as it was before the partial warmup. Recommend leaving the Turbo pump on the IVC tonight. |
| 0940 | Zach body temp = 98.5 |
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| 0959 | MB = 22.6% |
| 1005 | Zach arrives at lab. |
| 1010 | Tower/MC/Coldplate = 52.8/31.6/181 mK, Still = 1.24 K / 0.11 mbar / 0 mW, G1/G2= 207/215 mbar, 1K Pot = 1.70 K / 55±5 mbar. |
| 1013 | Turbo on CVJ = 3.4 nbar. |
| 1015 | CVJ after 1min with turbo valved out = 0.12 ubar. |
| 1030 | Move Turbo back to IVC. |
| 1122 | Open turbo to IVC. IVC = 0.10 ubar. |
| 1125 | Swap HV leads for negative bias. |
| 1151 | Begin LHe transfer @ MB = 19.5% |
| 1215 | Filled LN2 cold trap dewar. |
| 1224 | Ended LHe transfer @ MB = 92.0% |
| 1248 | Turbo on IVC = 5.4 nbar. |
| 1255 | MB = 91.7% |