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2012/05/10

1045 Mixing chamber temperature 81 K. Pump out nitrogen exchange gas.
1145 Fill N2 cold trap full.
1525 Start blowing out nitrogen. Helium leak background is 1.8E(-9)mbar*liters/s.
1600 Stop blowing out nitrogen. Helium leak rate is 6E(-9) mbar*l/s.
1810 Throughput rate is 28 mbar/min. Helium leak rate is 1.5E(-8) mbar*l/s.
Filled IVC with 0.12 mbar of Helium exchange gas.
Started liquid helium transfer.
2015 Stop helium transfer. Helium liquid level meter 94.7%.
2035 Start pumping out helium exchange gas at 7.5 K.