2020/08/28 (Friday)
- 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). |
|---|---|
| 0655 | MB = 29.1%. Predict it will hit 20% at 12:22. |
| 0945 | Tower = 48.9 mK |
| 0955 | Start a 15 min series at HV = -150V, drifting 0.0345 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_neg150V_pre15_2min_34p5mVps_multiloop10_15min.msl |
| 0955 | Vtest = -10.6 mV shortly after drift begins. Drift appears to start at -153.0 V. 2.8% HV loss. |
| 1012 | Vtest = -12.3 mV, HV = -183.8 V, drift ends. 2.7% HV loss. Lag ratio = 1.1ish. |
| 1012 | Tower = 48.8 mK |
| 1115 | Tower = 49.4 mK |
| 1125 | Start a 60 min series at HV = -150V, drifting 0.0335 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_neg150V_pre15_2min_33p5mVps_multiloop10_60min.msl |
| 1125 | Vtest = -9.7 mV shortly after drift begins. Drift appears to start at -152.9 V. 2.5% HV loss. |
| 1231 | Vtest = -17.1 mV, HV = -272.9 V, drift ends. 2.5% HV loss. Lag ratio = 1.1ish. |
| 1231 | Tower = 49.0 mK |
| 1200 | Zach body temp = 99.5 |
|---|---|
| 1255 | Zach arrives at lab. |
| 1255 | MB = 18.4% |
| 1300 | Brought LN2 dewar back, switched ebox purge source back to LN2 dewar. Nitrogen gas cylinder = 1380 psi. |
| 1310 | Tower/MC/Coldplate = 51.5/30.4/171 mK, Still = 1.15 K / 0.095 mbar / 0 mW, G1/G2= 213/215 mbar, 1K Pot = 1.70 K / 55±5 mbar. (Note: fridge still cooling from a flash.) |
| 1330 | Started LHe transfer @ MB = 18.4% |
| 1350 | Filled LN2 cold trap dewar. |
| 1404 | Ended LHe transfer @ MB = 92.2% |
| 1428 | MB = 91.6% |
| 1433 | Zach leaves lab. |
| 1500 | Zach body temp = 99.2 |
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| It looks like the optimal drift rate trend with bias has a temperature dependence. |