| | Setup: iZIP mode, DIB1/2/3 → cables → 3.2 MHz filters → DCRC55(1)/33(2)/50(3), Tower has been cooled below Al transition with mu-metal shield at standard position |
| 0820 | Tower/MC/Coldplate = 83.8/37.1/164 mK, Still = 1.39 / 0.095 mbar, G1/G2 = 200/185 mbar, 1K Pot = 1.57 K / 6.0 mbar, MB = 35.5% |
| | Tower temperature steadily increasing overnight. IVC = 8.6 nbar. This steady decay in base makes me suspect the He gas in the IVC, but not 100% sure |
| 0825 | Fill LN2 cold trap bath |
| 1000 | Tower temperature 87.9mK and rising. P1: 95ubar, G1/G2: 202/184mbar, 1K Pot: 1.56K / 5.5mbar. Power off DCRCs in preparation for >2K warm up. |
| 1035 | Tower temperature falls to a low of 78.5mK, then begins its slow rise again. |
| 1045 | Commence closing V6 to halt circulation and begin warmup. IVC pressure: 8.6E-6 mbar. |
| 1050 | V6 closed. Close V13B and turn off He3 pump. Turn on MC Heater to 1mW. |
| 1059 | Tower temperature SHOT up to 3.3K. Very fast. Turn off MC Heater. IVC pressure at 7.4E-3mbar. Tower temperature peaked at 3.3K and is now dropping. |
| | Tower temp dropped to 3.1K, then began rising again. With Tower temperature at 3.48K and IVC pressure at 8.6E-3mbar, open up turbopump to begin pumping on IVC. |
| | IVC pressure immediately drops to 1.6E-4mbar then begins dropping more slowly. Tower temperature still increasing to 3.7K. Though more oscillatory now than spiky increases. |
| 1151 | Tower temp has reached a new stable regime at 2.3K. IVC pressure at 1.2E-6 mbar. |
| 1230 | Tower temp at 1.6K and again has levelled off. IVC pressure at 1.2E-6 mbar. Most likely we're not pumping anything more out of the IVC, but we'll finish out the second hour of pumping before isolating the turbopump again. |
| 1250 | Tower temp: 1.6K. IVC pressure at 1.2E-6 mbar. Isolate turbopump and wait for IVC pressure to stabilize. |
| 1255 | IVC pressure increases to 7.4E-6 mbar. Open turbopump again and continue pumping over lunch. |
| 1335 | IVC pressure at 1.2E-6 mbar again. Isolate turbopump and wait for IVC pressure to stabilize. |
| 1345 | IVC pressure increases to 8.6E-6 mbar. This may be the best we can hope for. Close V3, turn on He3 pump, and begin opening V6 to recommence circulation. |
| 1355 | Commence LHe transfer (26.8%). |
| 1450 | Cease LHe transfer (94.0%). |
| 1450 | Tower temperature 725mK and dropping. V6 all the way open. P1: 0.17mbar, G1/G2: 388/355mbar. |
| 1505 | Let pressure out of main bath. |
| | Tower temperature at 122mK. P1: 0.15mbar, G1/G2: 297/270mbar. |
| 1615 | Tower temperature dropped to 37mK before bouncing back up to 72mK. |
| 1640 | P2 at 5.5mbar. Tweak open 1K Pot needle valve. |
| 1645 | Tower temperature falling again after pot tweak. Still temperature went up a bit. Tower = 50 mK. |
| 1702 | Tower temperature begins rising again. Tower temp at 64mK. Turn on Still heater to 1.0mW. |
| 1706 | Tower temperature drops a little to 62.5mK. P1 rises to 0.12mbar. |
| 1712 | MC Temperature at 31.0mK. |
| 1713 | Increase Still Heater to 2.0mW. |
| 1715 | Tower temperature 55.8mK and dropping. P1: 0.13mbar. |
| 1717 | Turn off Still Heater. Close V6 to commence warm up. IVC pressure: 7.4E-6mbar. |
| 1730 | Close V13B and turn off He3 pump. Close 1K Pot needle valve and 1K Pot speedivalve to cease pumping on 1K Pot. Close V4A and close manual valve on He4 pump, then power off He4 pump. Tower temperature now at 380mK and rising. Turn on MC Heater to 1.0mW. |
| 1742 | Open V3 to equalize pressure between both sides of the fridge. Tower temp: 713mK. |
| 1750 | Fill LN2 cold trap full. |
| 1810 | Tower temp: 1.4K. MC Temp: 1.65K. IVC Pressure: 7.4E-6 mbar. |
| 1815 | Close V3, Turn on He3 pump, open V9, and open V6 to begin pumping out fridge from Still side. |
| 1820 | Turn on Still Heater to 10mW, and open V5 to begin pumping from both sides of fridge. |
| 1825 | MC = 1.25 K, Tower = 1.13 K. No runaway in temperature yet and IVC remains at 7.4 nbar, so far. |
| | MC temperature now going down despite heating, pumping the mix is clearly having a cooling effect. G2 (dump) is up to 255 mbar but tapering off, MC = 1.18 K |
| 1830 | Increase MC Heater to 20mW. |
| 1840 | MC = 1.81 K, Tower = 2.09 K. G2 (dump) = 341 mbar. (David is opening and closing V6 so G2 is not going up much at the moment.) IVC = 8.6 nbar so almost no increase. |
| 1850 | G2: 419mbar. Close V6, V5, and V9. Turn off He3 pump. Right now, fridge lines are connected to Cold Trap 2. Open V3 to equalize pressure on sides of fridge. |
| | Tower temperature at 1.5K. IVC pressure: 7.4E-6 mbar. Open valve to turbopump to commence pumping on IVC overnight. |
| 1900 | Open V13B and V9 to open up a path from the fridge lines to the dump and leave that overnight. |
| 1910 | Tower = 3.6 K. G1/G2 = 325/285 mbar and rising steadily. Turbo = 3.4 nbar pumping on IVC. |