| 0200 | Perform room temperature electrical check: looks fine. |
| 0400 | Start pumping on IVC. |
| 1330 | Helium background level is rather high at 5E-6 mbar l/s, even after pumping overnight on IVC. Try flushing with nitrogen gas. |
| 1500 | Flushing with nitrogen gas helped a little, reducing the background to 1E-6 mbar l/s. However, the last few cycles have garnered no improvement. |
| | Fill IVC with 540 mbar of nitrogen gas. Leave it to circulate while cleaning nitrogen cold traps. |
| | Close valve 6 on IGH, and condenser line speedivalve and gate valve to isolate mixing chamber lines in fridge. |
| 1510 | Close valves 1, 5, 12a & 12b to stop pumping micture into dump. |
| | Close valve 9 to isolate dump. |
| | Pull cold traps out of liquid nitrogen reservoir. Open valves 7, 11a, 11b, 2a & 5a to open line to He-4 pump. Ensure valve behind He-4 pump is set to exhaust. |
| 1530 | Pump nitrogen out of IVC. Helps a little: background helium leak rate lies just under 1E-6 mbar l/s. |
| | Pump out N2 gas with turbo pump. |
| 1540 | Keep flushing with nitrogen gas over half-an-hour. |
| 1710 | Conducted three cycles to clean cold trap. Pressure in P2: 1000 mbar; 6.5 mbar; 3.2 mbar. Opened valve 2 periodically to pump out line leading to leaky valve 12a. |
| | Fill N2 cold trap full. Place cold traps back into reservoir. |
| | Pump nitrogen gas out of IVC. Finish flushing IVC. Background helium leak rate 9.5E-7 mbar l/s at 0.01 mbar. |
| 1730 | Start cryocleaning mixture. Valve 6 open 13.7%. |
| 1940 | IVC pressure 5.4E-5 mbar. Isolate turbo pump in preparation for leak check. |
| 1955 | Background helium leak level a little high at 7.5E-7 mbar l/s. For such a short run, this should be good enough. Start spray test. |
| 2015 | Spray tested flanges. Background helium leak level dropped to 7.3E-7 mbar l/s: no gross leak. For such a short run as this, a leak rate of 1E-6 mbar l/s would be acceptable. |
| | Raise dewar. |
| 2020 | Cryocleaning has stagnated. Open valve 6 to 14.0%. |
| 2130 | Pump and flush dewar. |
| 2140 | Overpressurise dewar with He-4 gas. Background helium leak level 6.5E-7 mbar l/s. No increase witnessed: no gross leak. |
| 2145 | Evacuate 1 K pot. |
| 2150 | Feed 4.6 mbar of N2 exchange gas into IVC. |
| 2200 | Start LN2 transfer. |