| 0125 | Fill N2 cold trap full. |
| 0155 | Mixing chamber temperature is 6.7 K. Rate of cooling has slowed significantly, although mixing chamber's temperature continues to decrease. However, I would like to go home at some point, so this is good enough. IVC pressure is 8.6E-7 mbar, and has remained unchanged for the past few hours. Pressurise helium dewar to increase rate of transfer. |
| 0250 | Cease helium transfer. Helium liquid level 68.6%. |
| 0300 | Mixing chamber temperature is 6.7 K, but decreasing. IVC pressure has increased to 1E-5 mbar. Some helium has made its way into the 1 K pot, so hopefully this is the reason for the aforementioned symptoms. However, this could all indicate a leak. Leave IVC to pump out overnight - if the temperature reaches 4.2 K in the morning, there is a leak and we will have to warm up. |