| 1100 | Fill cold trap full |
| | Tower temperature 77.8 K |
| 1235 | Tower temperature 77.6 K |
| | Electrical check |
| 1300 | Pump out N2 exchange gas |
| 1400 | Stop cryocleaning mixture; pump mixture into dump |
| 1440 | Throughput test yields 5 mbar/min: mixture might not be clean; pump mixture into dump |
| 1500 | Attempt to cryoclean again |
| 1600 | Stop evacuating IVC at pressure 1.6E-6 mbar |
| | Background He leak level 6E-9 mbar l/s |
| | Stop cryocleaning mixture; pump mixture into dump |
| 1725 | Throughput test yields no improvement. Perhaps cold trap 2 is dirty. Let's try cold trap 1. |
| 1755 | Start cryocleaning mixture through cold trap 1 |
| 1915 | Stop cryocleaning mixture; pump mixture into dump |
| 1940 | Throughput test yields no improvement |
| 2325 | Perhaps nitrogen cold traps and/or helium cold trap are dirty: Clean nitrogen cold trap 1 first! |
| | Currently open valves: Gate and speedivalves on fridge; V1 to condenser line; V5 to connect condenser line to pump; V6 to connect pumping line to pump; V9 to connect pump exhaust to dump. |
| | Most of the mixture has been pumped into the dump over the last couple of hours. Open V12a & V12b to pump on nitrogen cold traps while valves V13a & V13b are closed. When G1 reads 0.0 mbar, close V12a & V12b. Open V11a and V8 to pump remnants of mixture into dump. P1 rises to 0.9 mbar before falling again to its equilibrium of 0.012 mbar. |