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2012/05/09

0200 Tower installation procedure completed. Start evacuating IVC overnight.
0300 Filled LN2 cold trap.
1250 Filled the liquid Nitrogen cold trap.
1330 Did the leak check. The background is 2E(-9) mbar/s. No increase in leak rate during spray test: no gross leak.
1455 Raise dewar. Pump and flush main bath. Background helium leak rate 2E-9 mbar l/s. Leak rate increases to 2.5E-9 mbar l/s: no gross leak.
1535 Filled IVC with 7.4 mbar of N2 gas. Begin LN2 transfer.
1630 Nitrogen dewar is empty. Nitrogen liquid level resistance 1.12 kΩ. Will switch to department's supply after cold hardware meeting. Nitrogen transfer stopped and pin-pong ball attached.
1745 Recommence nitrogen transfer with 25 l bomb dewar. Mixing chamber temperature 218 K.
2030 Nitrogen liquid level resistance 1.32 kΩ. Nitrogen transfer complete.
2055 Fill N2 cold trap full.