| 1410 | Isolate fridge lines and close all valves on IGH. G1: 0.3mbar, P1: 20ubar, G2: 667mbar. |
| 1415 | Fill LN2 cold trap full. |
| 1510 | Open leak checker to IVC, with current mixing chamber temperature at 35 K. Initially background leak rate stabilized at 1.5E-5 mbarL/s. It slowly begins to decrease. |
| 1525 | Commence LHe transfer (34%). |
| 1530 | Leak rate has fallen from 8.6E-6 mbarL/s at start of LHe transfer to current value of 1.8E-6 mbarL/s. Pull LHe trap from fridge an allow to warm up while open to P2 (scroll pump speedivalve closed). |
| 1550 | With P2=6.5 mbar, and G1=4.1 mbar open scroll pump speedivalve and pump out contaminates. Close V1 and V2 to isolate LHe cold trap. Close scroll pump speedivalve. Pull out LN2 cold trap 1 and open 11A to open cold trap to P2. |
| 1600 | End LHe transfer (77.5%). Current IVC background rate at 1.3e-6 MbarL/s. Mixing chamber temperature at 34 K. |
| 1625 | With P2=5, open scroll pump speedivalve and pump out contaminates. Close V11A, and scroll pump speedivalve. Open V11B and pull out cold trap 2 from dewar. |
| 1645 | With P2=26 ubar, open scroll pump speedivalve, V11A, V1 and V2 to pump on all cold traps. |
| 1720 | Finish first round of cold trap cleaning. |
| 1800 | Finish second round of cold trap cleaning. |
| 1810 | With G1=2.4 mbar and G2=656 mbar, isolate cold traps and put them back in LN2 or LHe. Notice that with LN2 cold traps already isolated, G1 remains at 2.3 mbar until V1 is closed, in which it slowly lowers to 2.0 mbar. Perhaps something is still in He coldtrap? Fill LN2 cold trap full. |
| 1822 | IVC leak rate has slowly dropped to 7.3E-7 mbarL/s. Isolate IVC. Leak rate drops to 5.1E-8 mbarL/s. Start 1K Pot in order to cool down the fridge. Mixing chamber temperature currently at 32 K. |
| 1845 | 1K Pot at 1.7 K. Close 1K Pot needlevalve, and 1K Pot temperature drops to 1.6 K. Close 1K Pot speedivalve and 1K Pot temperature begins to rise. With leak rate stable at 2.6E-8 mbarL/s, open valve to connect to IVC. Leak rate rises to 1.2E-7 mbarL/s. Start throughput test with 1K Pot temperature at 5.5 K and rising. Allow mixture from dump to flow through cold trap 1 to G1 and through V3 to P1. When G2 has stabilized to 480 mbar, close cold trap 1 speedivalve, V12A and V3, and open V1 to begin throughput. G2 drops to 69 mbar before rising. Throughput test gives a flow rate of 47 mbar/min. Pump mixture back to dump. During throughput test IVC leak rate rose to 5.6E-7 mbarL/s. |
| 1950 | Suspect that the mixing chamber heater may have been still operating despite being “turned off.” Unplug cable that powers mixing chamber heater from cryostat. 1K pot currently 1.733K, but we will no longer be able to see the 1K pot temperature while the cable is unplugged. Mixing chamber temperature currently 31.4K. |
| 2033 | Currently G1=183 mbar and is connected to fridge lines with V1 opened so that is can condense, G2=331 mbar (V9 closed), P1=1000 mbar, mixing chamber temperature 30.27 K and dropping. Leave overnight. Cry. |