2018/07/22 (Sunday)
| overnight: Tower slowly climbing, then around 11am at 37 mK it climbed faster and steadily. Condenser pressure also rose steadily, about 100 mbar over 8 hours. Still and 1K Pot both pretty steady | |
| 1441 | Tower = 57.5 K, G1/G2 = 434/395 mbar, P1 = 0.055 mbar, 1K Pot = 1.467 K / 4.5 mbar. |
| 1441 | Fill LN2 cold trap full. |
| 1454 | Open 1K Pot needle valve about 10 degrees. Tower temp peaks at 67.0 mK, 1K pot pressure goes offscale. |
| 1459 | Turn on still heater to 0.1 mW |
| 1500 | Start LHe transfer (MB = 28.2%) |
| 1535 | 1K Pot = 1.55 K / 13 mbar |
| 1606 | End LHe transfer (MB = 89.8%) |
| 1607 | 1K Pot = 1.47 K / 5.5 mbar |
| 1605 | Tower = 78 mK and rising, not good |
| 1610 | Try turning on Still heater to 3 mW. Tower falls a bit, but Condenser pressure rises more quickly than before. |
| 1621 | Tower = 75.7 mK, G1/G2 = 484/443 mbar, P1 = 0.095 mbar, 1K Pot = 1.466 K / 5.0 mbar. |
| 1715 | Tower has flattened out around 80 mK, Condenser flattening at 550 mbar |
| 2035 | Tower temperature is climbing again, condenser pressure rising slowly too. Tower = 86 mK, Condenser = 580 mbar |
| 2040 | Try raising Still heater 3→6 mW. Still 0.090→0.130 mbar. |
| Tower temp dipped, then bounced back, then started slowly falling a bit. | |
| 2110 | Tower = 85 mK |
| 2140 | Tower temperature climbing again, now 92 mK. Condenser has risen to 690 mbar. This is not good. |
| 2205 | Lower Still heater 6.0→0.1 mW. Pressure comes down as I hoped. Tower temperature rises, not surprising. Over 100 mK now. |