| 0355 | Mixing chamber temperature appears to have stabilised at 7.1 K. IVC pressure 8.6E-7 mbar. Pressurise helium dewar to increase speed of transfer. |
| 0415 | Cease helium transfer. Helium liquid level 0%. |
| 0425 | Commence second helium transfer. |
| 0515 | Cease second helium transfer. Helium liquid level 76.0%. |
| 0540 | The mixing chamber temperature has dropped sharply to around 4.6 K. IVC pressure has increased to 1E-4 mbar. This may be due to helium entering the 1 K pot, providing some cooling. Hopefully this is not evidence of a leak. Mixing chamber is still cooling, but rate of descent has slowed down significantly. Hopefully 1 K pot will warm up, IVC pressure will decrease and mixing chamber temperature will rise over the next few hours. |
| 1030 | Mixing chamber temperature has risen slightly to 4.9 K and continues to rise, IVC pressure has dropped to 1.4E-6 mbar. |
| 1045 | Isolate IVC and start the 1K Pot. |
| 1115 | Stop 1K Pot since V6 is not yet fixed. Filled LN2 cold trap full. |
| 1530 | V6 has been repair and tested to prove it is now working. To test, mixture from the dump was allowed out of the dump such that P1=12.0mbar with V6 closed and G2=671 mbar. The system was monitored for 30 minutes to see if any mixture seeped through V6, which would result in a drop in P1 and/or a rise in G2. No such change occurred. |
| 1600 | With G1=0.0 mbar, P1=0.014 mbar and G2=672 mbar, commence cryocleaning. Open V6 to 12.8% initially to get flow. This seems to be the new 13.2% since we have altered V6. |
| | With IVC pressure of 7.4E-7 mbar*l/s and fridge temperature of 4.65 K, start 1 K Pot. |
| 1715 | Start recovering mixture to the dump. |
| 1825 | Commence circulation procedure. |
| 1836 | Manual circulation procedure complete. V6 fully open. |
| 2350 | Reduce 1 K pot temperature to 1.63 K. Mixing chamber temperature appears to have stabilised at 72.3 mK. |
| | Fill N2 cold trap full. |