| 1045 | Mixing chamber temperature 28K, 1K Pot temperature >7K, G1: 1.3mbar, P1: 7ubar, G2: 649mbar. Now that the mixing chamber is above LHe temperatures, recommence pumping out fridge lines with He3 circulation pump by opening gate and condenser line speedivalve. |
| 1130 | Fill LN2 cold trap full. |
| 1417 | Perform He-3 leak test with mixing chamber temperature of 25 K and 1K Pot temperature at >7 K (He level at -1.0%). Background leak rate of ~1E-11 mbarL/s, with no change in leak rate when opened to IVC. No indication of a He-3 leak. |
| 1513 | With a He-3 background leak rate of ~10E-9 mbarL/s, open IVC to leak checker. The leak rate dropped to ~10E-11 mbarL/s. While opening IVC flange the leak rate rose/oscillated. Upon closing the IVC flange the leak rate rose to 8.4E-9 mbarL/s. Overall there seems to be no indication of a He-3 leak. |
| 1550 | Switch leak checker to He-4 mode, and get a background leak rate of 1.1E-9 mbarL/s. Opening leak checker to IVC causes a rise in leak rate to 3.5E-5 mbarL/s, which then starts to fall. |
| 1600 | He-4 leak rate has reached 1.2E-5 mbarL/s and is still steadily, slowly falling. Stop leak checking and pump on IVC with turbopump. G1=1.5mbar, G2=657 mbar and P1=7 ubar. |
| 1730 | With mixing chamber temperature of 23.6 K, Sorb temperature of 22.9 K, isolate IVC from turbopump. |
| 1809 | Mixing chamber temperature at 23.5 K, Sorb temperature at 23.4 K, G1=0.3 mbar, G2=664 mbar, P1=9 ubar. Open gate valve and condenser line speedivalve. Fill LN2 cold trap dewar full. Perform throughput test with mixture, where mixture passes through cold trap 1 and V1 is opened once G1 is stable (changes are less than 1 mbar). When G1=531 mbar V1 is opened, with G1 dropping to 207 mbar before rising. Throughput test gives a flow rate of 125 mbar/min. Pump mixture back to dump. After test is completed Sorb temperature is at 22.5 K and mixing chamber temperature is at 23.3 K. |
| 1829 | Mixing chamber temperature at 23.3 K, Sorb temperature at 22.9 K, G1=1.9 mbar, G2=663 mbar. Perform throughput test with mixture, where mixture passes through cold trap 1 and V1 is opened once G1 is stable (changes are less than 1 mbar). When G1=535 mbar V1 is opened, with G1 dropping to 208 mbar before rising. Throughput test gives a flow rate of 125 mbar/min. Pump mixture back to dump. |
| 1845 | Mixing chamber temperature at 23.2 K, Sorb temperature at 22.8 K, G1=0.7 mbar, G2=663 mbar, P1=7 ubar. Perform throughput test with mixture, where mixture passes through cold trap 1 and V1 is opened once G1 and G2 are equal. When G1=507 mbar V1 is opened, with G1 dropping to 159 mbar before rising. Throughput test gives a flow rate of >130 mbar/min. Pump mixture back to dump. |
| 1914 | Start pumping on IVC with turbopump. Close gate and condenser line valves with P1=9 ubar, G1=1.0 mbar, G2=663 mbar. |