| 0020 | Fill N2 cold trap full. |
| 1000 | Filled LN2 cold trap. |
| 1030 | Removed bottom IVC flange. |
| 1435 | Perform electrical check. Everything looks as it did: shorts of ~100 MΩ from QET bias/return to ground still present. Carry on regardless. |
| 1445 | IVC sealed up. Started evacuating IVC. |
| 1645 | Filled LN2 cold trap. |
| 2045 | Conduct spray test. Background helium leak rate 5E-9 mbar l/s. Slight increase in leak rate to 7.5E-9 mbar l/s, but leak checker may be reading higher background from room. Worryingly, pressure sensor reads 6.3E-3 mbar while connected to leak checker pump. If memory serves, pressure does not exceed 4.6E-3 mbar. This would imply a possible leak. Press on regardless, perhaps I'm worrying about nothing. |
| 2215 | Open gate valve & condenser line speedivalve, and interrupt cryocleaning to pump mixture into dump. This is to ensure that mixing chamber lines within fridge are free of contamination. |
| | Evacuate 1 K pot. |
| 2225 | Raise dewar and evacuate main bath. Background helium leak rate 5.1E-9 mbar l/s. Overpressurise main bath with He-4 gas. Helium leak rate rises to 5.8E-9 mbar l/s. Does not look like a significantly large leak. We'll know tomorrow when we blow out the nitrogen. |
| | Evacuate 1 K pot. |
| 2250 | Fill IVC with 6.4 mbar N2 exchange gas. Start nitrogen transfer. |
| 2340 | Fill N2 cold trap full. |