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2014/06/04

1045 Fill LN2 cold trap full.
1300 Clean flanges and seal up.
1400 Begin pumping out IVC.
1700 IVC pressure at 6.8E-3 mbar. Begin leak check. Background leak rate of 1.9E-8 mbar*L/s.
1715 Final leak rate dropped to 1.7E-8 mbar*L/s. No leak detected. Proceed with raising dewar.
1750 Commence pumping out main bath.
1820 Fill main bath with Helium gas while monitoring leak rate of IVC. Spike in rate up to ~1.0E-3 mbar*L/s. Leak detected. Lower dewar to perform another leak test at bottom flange.
1910 Re-tighten bottom IVC flange and prepare for another leak check.
1915 Fill LN2 cold trap full.
1920 Background leak rate of 4.4E-8 mbar*L/s dropped to final leak rate of 4.2E-8 mbar*L/s. No leak detected. Leaving IVC to pump out overnight in hopes that indium will flow and fill in gaps that caused earlier leak. Current IVC pressure of 3.0E-3 mbar.