2022/01/08 (Saturday)
- Lab in-personnel: Matt
| Status | Run 75 in progress |
|---|---|
| Setup | Tower Faces 5/3/2 → Cables 2/1/3 → nothing/diverter_board/nothing → DCRC55(1)/DCRC50(3)/DCRCx(4) Lead shield in place. Am Source y = 20.01 mm |
| 1220 | Tower temperature has been high and wavering, between 50 and 54 mK. Try turning off 15V Power on all DCRCs. As seen before this causes temperature to rise, to 0.6 K. Then turn DCRC1 15V Power back on - this causes it to cool back to a good base, below 49 mK. Weird. |
| 1450 | Goldman = 47.5 mK. Adjust QET biases based on mini-IbIs trends versus temperature to target dP/dI = 1.0 uV on all channels. QET biases = 249.7/324/285.9/190.9/169.5/169.7/220.4/0/212.7/153.5/263.5/198.9 Adjust driver offsets so all baselines are around -0.9 to -1.0 V |
| 1458 | Start 0V data series, 39 min long, with 1000 initial randoms, no in-run randoms, trigger on DCRC3pB threshold 10. Start series with the Start Button. |
| 1501 | Goldman = 47.4 mK. Do in-run QET bias adjustment. QET biases = 250/324.3/286.3/191.3/169.8/170/220.5/0/212.9/153.7/263.7/199.2 |
| 1518 | Goldman = 47.5 mK. Do in-run QET bias adjustment. QET biases = 249.7/324/285.9/190.9/169.5/169.7/220.4/0/212.7/153.5/263.5/198.9 |
| 1525 | Goldman = 47.6 mK. Do in-run QET bias adjustment. QET biases = 249.5/323.7/285.6/190.5/169.2/169.4/220.3/0/212.5/153.3/263.3/198.5 |
| 1531 | Goldman = 47.7 mK. Do in-run QET bias adjustment. QET biases = 249.2/323.4/285.2/190.1/168.8/169.2/220.2/0/212.3/153.2/263.1/198.2 |
| 1535 | Goldman = 47.8 mK. Do in-run QET bias adjustment. QET biases = 249/323.1/284.9/189.7/168.5/168.9/220/0/212.1/153/262.9/197.9 |
| Note: accidentally set DCRC1pA too low briefly, had to relock it, so it was dead for a minute. | |
| 1620 | Goldman/Tower/MC(H35)/Coldplate = 48.5/162/33.6/182 mK, Still = 1.436±0.002 K / 0.110 mbar / 0 mW, G1/G2= 241/231 mbar, 1K Pot = 1.61 K / 17±1 mbar, MB = 22.9%. |
| Coldplate and Still are much lower than before, I guess because of turning off the 15V power on DCRCs 3&4 | |
| 1635 | Today's data wasn't copied to /byseries, I guess maybe LazyLogger isn't running… |
| 1640 | Restart MIDAS. LazyLogger seems to be running now. Data is being moved to /byseries. |
| 1629 | Begin LHe transfer @ MB = 22.9% |
| 1655 | Fill LN2 cold trap bath |
| 1706 | End LHe transfer @ MB = 90.9% |
| 1710 | Goldman = 44.0 mK, I think this is the lowest it's been |
| 1735 | Goldman/MC = 43.1/33.8 mK |