2020/10/12 (Monday)
- Lab in-person: Ruiren
- Virtual partner: Matthew
| 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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| 0935 | Tower = 66.0 mK. Over the last 2 hours it has swung up from 62.4 mK. |
| 1055 | Tower temperature wandering, waiting, hoping it will settle so we can try taking more data |
| 1121 | MB = 67.8% |
| 1430 | Phonon channels are a little hard to set, maybe just because the temperature is unstable? But let's zap. |
| 1435 | Zap DCRC1&4 SQUIDs |
| 1000 | Ruiren Shi body temperature = C 36.7 |
| 1507 | fill LN2 cold trap dewar |
| 1500 | some connection issue with LabView |
| 1530 | after restarting the LabView program, everything goes back to normal |
| At the same time the LabVIEW problem was occurring, something caused the tower to warm to as high as 0.2 K, it seems. But it's cooling…. | |
| 1533 | Tower/MC/Coldplate = 154/57/203 mK, Still = 1.50 K / 0.130 mbar / 0 mW, G1/G2= 240/231 mbar, 1K Pot = 1.62 K / 22±2 mbar. |
| 1543 | Ruiren leaves lab |
| 1810 | Tower = 76.6 mK, seems to still be cooling |
| 1845 | Tower = 66.3 mK, cooling in a steady curve. |
| 1915 | Tower = 64.8 mK, still cooling |
| 2030 | Tower = 63.3 mK, still cooling |
| 2205 | Tower = 62.4 mK. Finally looks like it's flattening. |
| 2222 | 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 = (0,235, 285, 0)/(0, 315, 295, 320)uA, 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) |
| 2222 | Tower = 62.4 mK |
| 2222 | Vtest = -4.8 mV shortly after drift begins. Rootsequencer says drift starts at -315.56 V. 0.61% HV loss. |
| 2239 | Tower = 62.2 mK. Adjust QET biases to (0,240, 285, 0)/(0, 320, 295, 320)uA |
| 2259 | Tower = 62.0 mK. Adjust QET biases to (0,240, 290, 0)/(0, 320, 300, 325)uA |
| 2306 | double-click Arduino_Create_Bridge - Shortcut on desktop. Log into https://id.arduino.cc/. Go to Web Editor and select Monitor. Enter command help, the Arduino responds. |
| 2306 | crap! This causes Tower temperature to shoot up to 0.5 K, then starts to cool. I forgot about that. Abort sequence with ctrl-c in Root. Then manually stop run on MIDAS page and turn off logger in ODB. Got 44 minutes of data. |
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| 2315 | Use RootSequencer function changeq() to step DCRC2qI back up to 11.59 (i.e. HV down to 0V). |
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| 2330 | Tower has cooled to 89 mK |
| 2330 | Do rd dwell, it says 15 ms. Set Dwell to 40 ms. |
| 2334 | Move source -4×26 steps with 4 minute pause after each move, mvNwait -4 240 26 This should move the source to y = -19.712 mm warm (-19.622 mm cold, after correction for differential contraction). That should point right in the gap between pF and pD. Total sequence should take 1hr 44min, ending at 01:18 am. |
| First move cause Tower spike to 1.15 K. Falls to 0.24 K before second move. That's a lot lower than in previous moves - usually only falls to 0.85 K between spikes. Is something wrong? Maybe power supply voltage is low, and the source isn't really moving. We'll have to check that tomorrow. Should be 8.0 V. | |
| 1145 | Between 2nd and 3rd move, Tower only falls to 0.65 K. OK maybe this is normal. |