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2011/07/16

1055 MC temperature 77.2K. IVC pressure:1.2mbar.
1115 Start to pump out exchange gas.
1123 IVC He background: 2.3e-9cc/s with pumping station connected.
1328 Cryo-cleaning was running too fast. Ice was condensed on the cold trap outlet. Adjusted V6 to 12.5%.
1458 Cryo-cleaning seemed stopped. Increase V6 to 13.9%.
1537 Pump mixture into dump.
1603 Isolate N2 cold trap 2 at G1=0.1mbar. G2=610mbar. Close V6.
1610 Isolate pumping station at IVC P=3e-6mbar.
1624 Filled N2 cold trap. IVC HE background: 9.7e-9cc/s.
1631 Throughput test: 50mbar/min. NO gross leak at BG 9.7e-9cc/s. Pump mixture into dump.
1645 Start to blow out N2
1709 Electrical checks are OK at 77K.
1800 Liquid N2 is out. G3 starts to drop.
1811 Stop pressurizing the bath. IVC He signal: 1.1e-8cc/s.
1825 Start to pump the main bath.
1838 Put in 0.16mbar He-4 exchange gas in IVC.
1839 Fill the bath with He gas.
1844 Evacuated and isolated 1K pot.
1908 Start initial He transfer.
1957 Start to pump out He-4 exchange gas at 25K, IVC pressure: 0.025 mbar. Temperature dropping rate was 1.25K/min.
2009 Temperature reaches the lowest point 15.3K and starts to rise.
2049 IVC He: 2.7e-6cc/s with pumping station connected.
2059 Finished He transfer at 91.2%. IVC He level 2.5e-6cc/s.
2110 IVC He level 1.96e-6cc/s.