| 1000 | With mixing chamber temperature of 1.7 K, 1K Pot temperature of 1.7 K, P1=34 mbar, and G1=11.4 mbar, stop 1K Pot, and open IVC lines to turbo pump. After a few moments switch to leak checker and isolate turbo pump. Initial background leak rate of 8.3E-10 mbarL/s. |
| 1032 | The leak rate has slowly dropped to 7.1E-10 mbarL/s, mixing chamber temperature of 2.0 K, 1K Pot temperature of 3.1 K, G1=31 mbar, and P1=1000 mbar. Fill LN2 cold trap full. |
| 1350 | Mixing chamber temperature of 2.0 K, 1K Pot temperature of 4.4 K, G1=137, and P1=1000 mbar (G2=7 mbar for unknown reason). Start pumping out He gas from fridge lines. Current leak rate of 4.8E-10 mbarL/s, and very slowly dropping. |
| | Pumping out fridge lines reduced temperature in mixing chamber. Turn on mixing chamber to 10 mW. Also, close V7 to stop pumping on fridge lines whenever mixing chamber temperature drops to 2.3 K, allow time for mixing chamber to warm up before starting to pump out again. Repeat process as needed. |
| 1550 | Leak rate rose and then somewhat plateaued at 2.4E-8 mbarL/s, though it is still rising at a slower rate. P1 has dropped below 1000 mbar (currently at 18 mbar), with mixing chamber temperature at 10 K and 1K Pot temperature at 4.4 K. |