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2011/11/13

1930 Fill N2 cold trap full.
IVC pressure 1.4E-5 mbar: looks like pumping overnight didn't do anything to help. Switch off mixing chamber heater in preparation for condensening mixture.
1935 Mixing chamber temperature dipped below 4.2 K. IVC pressure decreased to 7.4E-6 mbar, but has increased in the last five minutes to 1.2E-5 mbar. I don't think condensing the mixture is going to work.
1945 Start 1 K pot: temperature 1.7 K.
Interrupt cyrocleaning. Pump mixture into dump.
2025 Open condenser line speedivalve and gate valve. Commence condensing mixture through nitrogen cold trap 1. Temperature of 1 K pot 1.86 K.