2020/10/23 (Friday)
- 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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| 0620 | Finish IbIs on DCRC1pD. Implied detector temperature = 58.1 mK. Tower thermometer varied withing 79-79.2 mK. This is reasonably consistent with yesterdays |
| 0633 | 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 DCRC1pD threshold = 8 Use RootSequencer.c, function drift_sequence(300,0.0262) Use QETbias_update.c, function sequence_update_QETbiases(66,30,0,0.19,43.2) |
| 0633 | Vtest = 2.2 mV shortly after drift begins. Drift starts at 313.4 V according to RootSequencer. 0.28% HV loss. |
| Tower thermometer wandered between 78.1 and 78.8 mK during series. | |
| 0734 | Vtest = 2.5 V at end of drift. Final HV = +407.7 V according to RootSequencer. 0.25% HV loss. |
| 0921 | 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 DCRC1pD threshold = 8 Use RootSequencer.c, function drift_sequence(100,0.0274) Use QETbias_update.c, function sequence_update_QETbiases(66,30,0,0.2035,42.1) |
| 0921 | Vtest = 0.7 mV shortly after drift begins. Drift starts at 106.4 V. 0.26% HV loss. |
| Tower swung between 77.3 and 78.2 mK during series. | |
| 1022 | Vtest = 1.2 V at end of drift. Final HV = +204.3 V. 0.23% HV loss. |
| 1106 | Start a 60 min series at HV = +10V, drifting 0.0220 V/s, with 15% 2min prebias (by mistake), 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 DCRC1pD threshold = 8 Use RootSequencer.c, function drift_sequence(10,0.022) Use QETbias_update.c, function sequence_update_QETbiases(62,30,0,0.2035,42.1) |
| 1106 | Vtest = 0.16 mV shortly after drift begins. Drift starts at 12.6 V. 0.51% HV loss. |
| 1110 | DCRC1pB (Side1pA) has some weird pulse shapes. Tried relocking and adjusting SQUID offset, not sure it helped - some pulses are OK |
| 1200 | Still seeing ugly pulses in DCRC1pB, this is probably pretty bad data |
| Tower fell from 79.0 to 76.4 mK during series. | |
| 1206 | Vtest = 0.5 V at end of drift. Final HV = +91.6 V. 0.22% HV loss. |
| 1000 | Ruiren temperature = 36.6 C |
| 1230 | Ruiren enters lab |
| 1233 | Tower/MC/Coldplate = 77.6/31.5/202 mK, Still = 1.50 K / 0.120 mbar / 0 mW, G1/G2= 245/218 mbar, 1K Pot = 1.63 K / 20±2 mbar. |
| 1237 | switched hv leads from positive to negative |
| 1322 | start lHe transfer main bath at 27.9% |
| 1323 | transfer lN2 to the cold trap dewar |
| 1310 | the o-ring of the extender of transfer line is missing and we used a new one |
| 1450 | finished lHe transfer main bath at 87.4% |
| 1425 | Looked at DCRC1pB SQUID modulation curve - looks ugly. Let's zap. |
| 1430 | Zap DCRC1&4 SQUIDs |
| 1445 | Tower thermometer = 55 mK and falling. Much lower than usual. This happened after the transfer a couple of days ago too - Tower thermometer fell low after transfer, then after 90 minutes started rising again to it's normal 80s-range. |
| 1510 | Do IbIs on DCRC1pD. Apparent detector temperature = 57.4 mK. Tower thermometer read 53.1-53.4 mK - actually lower. So this is definitely not the usual pattern. |
| 1522 | Ruiren leaves lab |
| 1620 | The last few IbIs gave detector temperatures within 57.0-57.4 mK. Probably we could take data assuming a constant temperature. |
| 1624 | 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 |
| Tower went from 58.5 to 55.8 mK during series. | |
| Take IbIs after series is over - implied detector temperature = 58.4 mK. So it changed more than I'd have liked, temperature not very constant during series. |
| 1820 | Take a few IbIs measurements, detector temperature is around 58.4 mK, Tower thermometer around 55 mK. |
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| 1830 | 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 = set automatically to track temperature, 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) Use QETbias_update.c, function sequence_update_QETbiases(64,30,0,0.0667,54.76) |
| 1830 | Vtest = -0.65 mV shortly after drift begins. Drift starts at -106.6 V. 0.24% HV loss. |
| Tower thermometer stayed between 54.3 and 54.5 mK for most of the series, but at the end wandered up to 55.0 then down to 53.3 | |
| 1930 | Vtest = -1.05 V at end of drift. HV = -206.7 V. 0.20% HV loss. |
| 2050 | Repeated IbIs consistently shows Detector temperature around 58.4 mK, while Tower thermometer has varied from 56 to 54 mK. |
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| 2103 | 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 update_QETbiases(58.4) |
| 2103 | Vtest = -1.9 mV shortly after drift begins. Rootsequencer says drift starts at -315.6 V. 0.24% HV loss. |
| Tower thermometer generally fell during series, from 54.4 to 54.0 mK | |
| 2204 | Vtest = -2.3 V at end of drift. HV = -425.4 V according to RootSequencer. 0.22% HV loss. |
| 2230 | Check Arduino html tab, do rd dwell, 40 ms, good. |
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| 2232 | Move source -4×25 steps with 4 minute pause after each move, mvNwait -4 240 25 This should move the source to y = -41.010 mm warm (-40.855 mm cold, after correction for differential contraction). This is in pB territory, about 0.5 mm shy of the endstop. Total sequence should take 1hr 40min, ending at 12:12 am. |