| 1500 | Mixing chamber temperature 19.1 K, sorb temperature 19.7 K, background helium leak rate in lines leading to IVC 9.7E-10 mbar l/s. Open up IVC. Helium leak rate reaches 4.6E-8 mbar l/s. Increased by an order of magnitude from two days ago. Might be cause for concern, but we have operated with higher leak rates in the past. |
| | Isolate IVC. Isolate leak checker and resume pumping on lines to IVC with turbo pump. Start 1 K pot. |
| 1520 | After dropping to ~1.8K, 1K pot temperature rises to 1.97K. Close needle valve to cool. |
| 1655 | Commence LHe (8.7%). |
| 1750 | End LHe transfer (91.1%). |