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2012/09/02

1515 Fill N2 cold trap full.
Fed Cricket 4 pellets.
1540 Mixing chamber temperature 6.98 K, and hovering around the same temperature. Helium leak level in pipes leading to IVC 1.5E-9 mbar l/s. Open up IVC and helium leak rate increases to 1.5E-6 mbar l/s. Value is fairly constant. Looks like 1 K pot is warm enough and we can proceed with leak checking test.
1545 Isolate IVC and start 1 K pot: temperature 1.6 K.
Isolate leak checker and pump on lines to IVC with turbo pump.
1920 Temperature of 1 K pot has been 1.76 K for some time. Stop 1 K pot.