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2011/10/19

0955 IVC pressure 4.6e-5 mbar. Tightened IVC bottom In seal again.
1457 IVC pressure 3.0e-5 mbar.
1525 Calibrated the leak checker with a 1.4e-7cc/s standard leak. Could not reach the rated reading. Positioned the leak value at 0.7e-7cc/s for convenience. The real leak value will be twice of the reading.
1535 Room He background 7e-9cc/s.
1555 Room He BG 6.4e-9cc/s. The signal is very noisy. A lot of spikes showing up on the baseline.
1557 After tightening all the clamps, the spikes became less frequent.
1603 Room He BG ~6e-9cc/s.
1608 Isolate pumping station. IVC He BG 2.2e-8cc/s.
1616 No gross leak found at BG 2.1e-8cc/s/
1845 Raise dewar. Pump and flush main bath. No leak found above background level of 1E-8 mbar l/s.
Fill IVC with 4.6 mbar N2 exchange gas. Commence nitrogen transfer.
2015 Main bath full. Cease nitrogen transfer.
2125 Fill N2 cold trap full.
Start cryocleaning mixture overnight. Valve 6 on IGH open 13.9%.