2020/10/13 (Tuesday)
- Lab in-person: Michael, Matt
- Virtual partner: none
| 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). |
|---|---|
| 0721 | MB = 38.1% |
| 0740 | Tower = 61.9 mK. Swung as high as 62.8 mK during the last hour. |
| Some phonon channels ok, some look bad. Let's zap. | |
| 0745 | Zap DCRC1&4 SQUIDs |
| 0750 | All five channels look good! Still cooling after zap. |
| 0820 | Tower = 60.0 mK. It may be settling, we'll see |
| 0925 | Tower = 60.5 mK. It's wandering between 59.9 and 60.8. That's not great, but I've seen worse. |
| 1005 | Tower continues to swing between 59.7 and 61.0, annoying. |
| 1015 | Matt Fritts body temperature = 96.9 F |
| Let's try to take some data despite the not-too-stable temperature. I'll change QET biases on the fly to try to compensate for the changing temperature. | |
| 1028 | Start a 60 min series at HV = 0V, CDMS detector: Driver Gains = 1x, DCRC4/1 QET biases = see below, 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 |
| 1028 | Tower = 59.7 mK, QET biases = (0,255, 310, 0)/(0, 330, 325, 345)uA |
| 1032 | Tower = 59.6 mK, QET biases = (0,255, 310, 0)/(0, 335, 325, 350)uA |
| 1044 | Tower = 59.5 mK. Leave QET biases the same. |
| 1047 | Tower = 59.7 mK, QET biases = (0,255, 310, 0)/(0, 330, 325, 345)uA |
| 1050 | Tower = 59.8 mK, QET biases = (0, 255, 310, 0)/(0, 330, 320, 345)uA |
| 1053 | Tower = 60.3 mK, QET biases = (0, 250, 305, 0)/(0, 330, 315, 340)uA |
| 1055 | Tower = 60.1 mK, QET biases = (0, 250, 305, 0)/(0, 330, 320, 345)uA |
| 1058 | Tower = 59.9 mK, QET biases = (0, 255, 305, 0)/(0, 330, 320, 345)uA |
| 1100 | Tower = 59.7 mK, QET biases = (0, 255, 310, 0)/(0, 330, 325, 345)uA |
| 1104 | Tower = 60.1 mK, QET biases = (0, 250, 305, 0)/(0, 330, 320, 345)uA |
| 1112 | Tower = 60.3 mK, QET biases = (0, 250, 305, 0)/(0, 330, 315, 340)uA |
| 1122 | Tower = 60.7 mK, QET biases = (0, 250, 300, 0)/(0, 325, 315, 335)uA |
| 1126 | Tower = 60.5 mK, QET biases = (0, 250, 300, 0)/(0, 330, 315, 340)uA |
| 1128 | Tower = 60.3 mK, QET biases = (0, 250, 305, 0)/(0, 330, 315, 340)uA |
| 1130 | Data series is finished. That was pretty tedious. |
| 1215 | Tower = 59.5 mK, QET biases = (0, 255, 310, 0)/(0, 335, 325, 350)uA |
|---|---|
| 1221 | 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 = see above&below, 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) |
| 1221 | Vtest = -4.3 mV shortly after drift begins. Rootsequencer says drift starts at -315.6 V. 0.55% HV loss. |
| 1239 | Tower = 60.1 mK, QET biases = (0, 250, 305, 0)/(0, 330, 320, 345)uA |
| 1242 | Tower = 59.7 mK, QET biases = (0, 255, 310, 0)/(0, 330, 325, 345)uA |
| 1247 | Tower = 60.3 mK, QET biases = (0, 250, 305, 0)/(0, 330, 315, 340)uA |
| 1253 | Tower = 60.0 mK, QET biases = (0, 250, 305, 0)/(0, 330, 320, 345)uA |
| 1300 | Tower = 59.7 mK, QET biases = (0, 255, 310, 0)/(0, 330, 325, 345)uA |
| 1306 | Tower = 59.5 mK, QET biases = (0, 255, 310, 0)/(0, 335, 325, 350)uA |
| 1322 | Vtest = -5.3 V at end of drift. HV = -425.4 V according to RootSequencer. 0.50% HV loss. |
| 1325 | Michael arrives in lab. Body temp 98.6 |
|---|---|
| 1339 | Tower/MC/Coldplate = 115/42/192 mK, Still = 1.42 K / 0.120 mbar / 0 mW, G1/G2= 233/18 mbar, 1K Pot = 1.62 K / 22±2 mbar. |
| 1339 | Fridge still cooling after flash, so temperatures not constant yet. |
| 1340 | Fill LN2 cold trap bath |
| 1410 | Oring got stuck in transfer tube extender. Removed from transfer stick. |
| 1422 | Begin LHe Transfer at MB = 27.9% |
| 1456 | End LHe transfer @ MB = 91.4% |
| 1525 | Switch HV leads to positive bias |
| 1525 | MB = 91.5% |
| 1525 | Matt and Michael leave lab |
| 1605 | Tower = 60.6 mK, currently falling at ~ 1 mK/hour |
| 1636 | Tower = 60.5 mK, QET biases = (0, 250, 300, 0)/(0, 330, 315, 340)uA |
| 1642 | Tower = 60.7 mK, QET biases = (0, 250, 300, 0)/(0, 325, 315, 335)uA |
| 1643 | 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 = see above&below, 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) |
| 1643 | Vtest = 4.0 mV shortly after drift begins. Rootsequencer says drift starts at 313.4 V. 0.51% HV loss. |
| 1651 | Tower = 61.1 mK, QET biases = (0, 245, 295, 0)/(0, 325, 310, 335)uA |
| 1654 | Tower = 60.8 mK, QET biases = (0, 245, 300, 0)/(0, 325, 310, 335)uA |
| 1709 | Tower = 60.6 mK, QET biases = (0, 250, 300, 0)/(0, 330, 315, 340)uA |
| 1744 | Vtest = 4.6 V at end of drift. HV = +407.7 V according to RootSequencer. 0.45% HV loss. |
| 2115 | Check Arduino browser tab. We still have communication with source mover. Check dwell: dwell=40 ms as it should. |
|---|---|
| 2120 | Move source -4×20 steps with 4 minute pause after each move, mvNwait -4 240 20 This should move the source to y = -21.034 mm warm (-20.998 mm cold, after correction for differential contraction). This is just into pD territory. Total sequence should take 1hr 20min, ending at 10:41 pm. |