2020/08/06 (Thursday)
- Lab in-person: Zach
- Virtual partner: Matt
| 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). |
|---|---|
| 0945 | Zach body temperature = 98.8 |
| 1000 | Zach arrives at lab. |
| 1017 | MB = 32.0% |
| 1023 | Tower/MC/Coldplate = 53.2/36.6/192 mK, Still = 1.50 K / 0.17 mbar / 4 mW, G1/G2= 482/440 mbar, 1K Pot = 1.64 K / 24±2 mbar. |
| 1141 | Started LHe transfer @ MB = 30.4% |
| 1156 | Filled LN2 cold trap bath |
| 1214 | Ended LHe transfer @ MB = 89.9% |
| 1245 | Swapped HV leads, now at negative bias. |
| 1247 | MB = 89.9% |
| 2120 | Write new sequence to drift at -20V using the same drift rate that worked for -15V, 23.9 mV/s. HVdrift_neg20V_23p9mVps_multiloop10_nopre_60min.msl |
| 2123 | Start a 60 min series at HV = -20V, drifting 0.0239 V/s, no prebias, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = (0,320,370,0)/(0,360,420,420) uA, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR randoms, trigger on DCRC1pD threshold = 8 Use sequence HVdrift_neg20V_23p9mVps_multiloop10_nopre_60min.msl |
| 2125 | Tower = 52.3 mK |
| 2125 | Vtest = -1.1 mV shortly after drift begins. Drift appears to start at -19.4 V. |
| 2229 | Vtest = - 4.5 mV, HV = -104.7, drift ends. Lag ratio = 1.10. |
| 2229 | Tower = 52.0 mK |
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| I estimate that the -20V drift rate should be increased from 23.9→24.9 mV/s. |