2020/10/16 (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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| 0600 | MB = 68.9%. Note: In standard Slow mode, the level meter updates every 60.052 minutes. |
| 0710 | Tower = 62.8 mK. Wandered between 63 and 66 mK over the last hour. |
| 0736 | Start a 60 min series at HV = 0V, 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 sequence SimpleDataLoopNoFlash.msl \\Use QETbias_update.c, function sequence_update_QETbiases(62,30) |
| 0836 | Tower temperature generally fell from 61.5 to 59 mK during the serious, with a lot of up and down swings along the way. |
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| 0900 | Tower = 58.0 mK, generally falling |
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| 0931 | 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 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(300,0.0305) Use QETbias_update.c, function sequence_update_QETbiases(70,30) |
| 0931 | Vtest = -2.4 mV shortly after drift begins. Rootsequencer says drift starts at -315.6 V. 0.30% HV loss. |
| Tower temperature stayed close to 57.6 mK for 40 minutes, then climbed to 59.1 mK. For the last 10 minutes it had fallen to around 58.3 mK. | |
| 1032 | Vtest = -3.2 V at end of drift. HV = -425.4 V according to RootSequencer. 0.30% HV loss. |
| Drift rate looks about right. Between 40 and 50 minutes the gain is a bit too high, suggesting that the QETbias updater overcompensated a bit. |
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| 1155 | Tower = 57.0 mK. Cooling. |
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| 1221 | 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(70,30) |
| 1221 | Vtest = -0.7 mV shortly after drift begins. Drift starts at -108.3 V. 0.26% HV loss. |
| Tower temperature started around 56.8 mK and fell steadily to 56.5 mK during series. Better than most series. | |
| 1322 | Vtest = -1.2 V at end of drift. HV = -210.3 V. 0.23% HV loss. |
| Drift was too slow. | |
| 1351 | swap HV bias leads to positive polarity |
| 1000 | Ruiren body temperature = 36.5 C |
| 1359 | Tower/MC/Coldplate = 59.6/32.0/197 mK, Still = 1.52 K / 0.120 mbar / 0 mW, G1/G2= 233/217 mbar, 1K Pot = 1.63 K / 22±2 mbar. |
| 1351 | fill in lN2 cold trap dewar |
| 1410 | Ruiren leaves lab |
| 1420 | Tower = 57.7 mK, cooling |
| 1630 | Tower = 56.7 mK, slowly cooling |
| 1637 | Start a 60 min series at HV = +100V, 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(100,0.0262) Use QETbias_update.c, function sequence_update_QETbiases(70,30) |
| this was a mistake - I'm using the drift rate for +300V, not the drift rate for +100V. | |
| 1637 | Vtest = 0.8 mV shortly after drift begins. Drift starts at 107.9 V. 0.30% HV loss. |
| 1720 | Seeing weird pulse shapes in DCRC1pB/Side1pA. Pulses are undershooting. Maybe need to retune SQUID? Or zap? |
| Tower started at 56.7 mK and settled to 56.6 mK. Nice and constant | |
| 1738 | Vtest = 1.2 V at end of drift. Final HV = +201.6 V. 0.24% HV loss. |
| 1835 | Tower = 57.4 mK, cooling |
| 1835 | DCRC1pB SQUID modulation curve looks weird. Let's zap. |
| 1835 | Zap DCRC1 SQUIDs |
| 1855 | DCRC1pB SQUID modulation looks much better after the zap! Retune SQUID |
| 1855 | DCRC4 channels have problems now though. Can't lock pB, and pC doesn't seem to be time-synced with DCRC1 (??) |
| 1855 | Zap DCRC1&4 SQUIDs |
| 1905 | Channels look ok but DCRC4 is out of time sync with DCRC1. hmm. I blame the SQUID tuning thing. |
| 1910 | Turn DAQ programs off and on. Time sync working. But now some channels look like they have really low amplitudes, and DCRC1pB has weird noise. Zap again… |
| 1915 | Zap DCRC1&4 SQUIDs |
| 1935 | dammit - DCRC2 was set to version 3.1 again - screwed up the HV, now there's some nasty high voltage on the detector. |
| 1935 | Stop DAQ programs, reset DCRC2 to version 3, restart programs. |
| 1940 | HV goes back to zero. Guess we need to flash the detector now. |
| 1940 | Flash detector |
| 2030 | Tower = 56.7 mK and cooling. Channels look OK. |
| 2045 | Tower = 56.5 mK, probably still cooling a bit |
| 2053 | 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(70,30) |
| 2053 | Vtest = 2.0 mV shortly after drift begins. Drift starts at 313.4 V according to RootSequencer. 0.26% HV loss. |
| Tower started at 56.5 mK and settled to 56.1 mK. Pretty good. | |
| 2154 | Vtest = 2.6 V at end of drift. Final HV = +407.7 V according to RootSequencer. 0.26% HV loss. |
| 2005 | On Arduino browser tab do “rd dwell”: 40 ms, good. |
| 2022 | Move source -4×82 steps with 4 minute pause after each move, mvNwait -4 240 82 This should move the source to y = -29.501 mm warm (-29.381 mm cold, after correction for differential contraction). Middle of pD. Total sequence should take 5hr 28min, ending at 3:50 am. |