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2014/08/29

1100 Fill LN2 cold trap full.
1125 Could not get flow during cryocleaning. Circulation pump was found to be off. It most likely tripped the circuit breaker.
1130 Recommence cryocleaning (G2 had reached 624 mbar).
1237 Pump mix to dump.
1255 G1= 0.0 mbar, P1=14 ubar, G2=638 mbar. Start cryocleaning though cold trap 2.
1410 Pump mix to dump.
1455 Finish pumping to dump. G1=0.0mbar, G2=633mbar. Isolate dump. Remove cold trap 2 from bath for cleaning.
1545 Finish first round of cold trap cleaning.
1610 Commence leak check. Background leak rate of 8.9E-10mbar*L/s.
At top most IVC flange rate increased quickly to 9.2E-10mbar*L/s. Rate dropped back down after a minute. This indicates a small leak at top most flange.
1620 Leak rate oscillated around 9.0E-10mbar*L/s. No sign of a leak. Switch back to pumping on IVC with turbopump.
1720 Fill LN2 cold trap full after inserting cold trap 2. With G2=634 mbar, commence cryocleaning through cold trap 2.