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2012/06/26

0130 Nitrogen liquid level meter resistance 1.34 kΩ. Stop nitrogen transfer. Attach ping-pong ball.
0135 Fill N2 cold trap full.
1055 Fill N2 cold trap full.
1355 Begin pumping out N2 exchange gas. Mixing chamber temperature: 79 K.
1600 Pump mixture into dump in preparation for throughput test.
1650 Accidentally began blow-out of LN2 before starting leak checker. Stopped blow-out process. Turned on LC.
Background leak rate: 5.3E-9 mbar l/s
1655 Re-commence blow-out of LN2
1800 Finished removal of LN2. Leak rate: 6.3E-9 mbar l/s. No gross leak thus far!
1918 Throughput test: 85 mbar/min. A bit high, but we were more concerned to see if there was a leak, and no leak was detected. Leak rate: 6.4E-9 mbar l/s.
2005 Filled main bath with helium gas. No leak detected.
Dropped dewar
Filled IVC 0.86 mbar of N2 gas