2020/10/24 (Saturday)
- Lab in-person: Ruiren
- 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. Lead/poly shield erected (4 lead walls, 2 poly walls). |
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| 0930 | Tower temperature is swinging between 96 and 99 mK. IbIs suggests detector temperature around 61 mK. |
| 1000 | Finish several IbIs measurements on DCRC1pD to get a relationship between current Tower thermometer and apparent detector temperature |
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| 1012 | Start a 60 min series at HV = -300V, drifting 0.0305 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases set for 58.4 mK, 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(300,0.0305) Use QETbias_update.c, function sequence_update_QETbiases(64,30,0,0.257,35.79) |
| 1012 | Vtest = -1.8 mV shortly after drift begins. Rootsequencer says drift starts at -315.6 V. 0.23% HV loss. |
| Tower thermometer swung between 95.8 and 97.5 mK during series | |
| 1113 | Vtest = -2.1 V at end of drift. HV = -425.4 V according to RootSequencer. 0.20% HV loss. |
| 1000 | Ruiren temperature = 36.6C |
| 1116 | Ruiren enters lab |
| 1117 | transfer lN2 to cold trap dewar |
| 1122 | Tower/MC/Coldplate = 96.4/32.1/194 mK, Still = 1.47 K / 0.120 mbar / 0 mW, G1/G2= 248/219 mbar, 1K Pot = 1.63 K / 20±2 mbar. |
| 1124 | swap HV leads from negative to positive |
| 1130 | Ruiren leaves lab |
| 1238 | Start a 60 min series at HV = 0V, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = set for 57.1 mK, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pD threshold = 8 Use sequence SimpleDataLoopNoFlash.msl Use QETbias_update.c, function sequence_update_QETbiases(61,30,0,0.082,52.615) |
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| Tower thermometer spanned from 91.5 to 96 mK during series, mostly rising. |
| 1749 | Start a 60 min series at HV = +300V, drifting 0.0262 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = set automatically to track temperature, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pB/D threshold = 8/8 Use RootSequencer.c, function drift_sequence(300,0.0262) Use QETbias_update.c, function sequence_update_QETbiases(68,30,0,0.09,51.93) |
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| 1749 | Vtest = 1.9 mV shortly after drift begins. Drift starts at 313.4 V according to RootSequencer. 0.24% HV loss. |
| Tower thermometer wandered between 92.6 and 93.2 mK during series. | |
| 1850 | Vtest = 2.1 V at end of drift. Final HV = +407.7 V according to RootSequencer. 0.21% HV loss. |
| 2018 | Start a 60 min series at HV = +100V, drifting 0.0274 V/s, prebias 15% for 2min, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = set automatically to track temperature, Front-End Gains = (3/3/3)/(5/5/5) 1000 BOR & 5 Hz in-run randoms, trigger on DCRC1pB/D threshold = 8/8 Use RootSequencer.c, function drift_sequence(100,0.0274) Use QETbias_update.c, function sequence_update_QETbiases(65,30,0,0.1,51.063) |
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| 2018 | Vtest = 0.6 mV shortly after drift begins. Drift starts at 107.2 V. 0.22% HV loss. |
| Tower thermometer swung between 93.8 and 94.7 mK during series. | |
| 2119 | Vtest = 0.95 V at end of drift. Final HV = +205.1 V. 0.19% HV loss. |