Problem innotec SNF 2007-10-07 23:20:49: High cryo T and Pressure

dasgupta at snf.stanford.edu dasgupta at snf.stanford.edu
Sun Oct 7 23:20:50 PDT 2007


When I arrived at innotec, it had been pumping almost 2 hours and cryopump temp was 19K with pressure 6e-7.  I pumped down for 3 hours and base pressure was barely below 5e-7, and temp was still 19K.  As I deposited material, pressure steadily rose, sometimes above 1e-6 and I had to wait a long time for pressure to return to desired levels.




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