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2015/02/10

1035 Commence leak check of IVC flanges. Background leak rate of 7.8E-9 mbarL/s. Rate rose slightly to 8.4E-9 mbarL/s at bottom flange.
1130 After tightening, recommence leak check. Background rate of 9.0E-9 mbarL/s. Rate fell during test to 8.8E-9 mbarL/s. No leak detected.
1200 Raise dewar.
1300 Pump and flush main bath.
1400 Commence LN2 transfer.
1530 End LN2 transfer, due to Nitrogen dewar emptying. Current mixing chamber at 126 K and falling. Attach ping pong ball.
1700 Recommence LN2 transfer with full dewar. Current mixing chamber temperature 80K and falling.
1740 Pump out Cold Trap 2 with scroll pump in preparation for throughput test tomorrow.
1804 Level meter resistance 1.33 kΩ. Transfer complete. Current mixing chamber temperature at 77.3 K. Pump out IVC exchange gas.