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2012/12/11

1020 Fed Cricket 3 pellets.
1425 Fill N2 cold trap full.
Cease pumping on mixing chamber.
Mixing chamber temperature 20.7 K. Background helium leak rate 6.5E-10 mbar l/s. IVC leak rate 4.2E-8 mbar l/s.
1505 Helium leak rate in IVC is low enough to try condensing and circulating the mixture again. We should have just about enough helium (liquid level 10.9%).
Switch off mixing chamber heater.
1540 Start 1 K pot, temperature 1.6 K. Mixing chamber temperature 20.3 K.
1550 Cease recovery of mixture from fridge. Close gate valve and condenser line speedivalve. Start cryocleaning mixture through nitrogen cold trap 2. Dump pressure 725 mbar.
1635 Begin LHe transfer (6.5%).
1652 End LHe transfer (31.6%).
1726 Pump mixture to dump to prepare for condensing.
1740 Fed Cricket 4 pellets.
1908 Started condensing awhile ago. V12A is all the way open now. Going to leave mixture to condense in lines overnight and for temperature of mixing chamber to cool.