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2011/06/08

0200 Tower installation complete. IVC sealed.
0216 Start pumping IVC and Dewar. Dewar pressure is >3e-2bar before pumping.
1320 Stop pumping dewar.
Conduct helium leak check. Leak rate 5.5E-9 mbar l/s: fine.
1400 Conduct quick electrical check: everything looks good.
Raise dewar.
1500 Overpressure main bath with He gas. Helium leak rate 7E-9 mbar l/s: good enough.
Evacuate 1 K pot.
Fill IVC with 5.4 mbar N2 exchange gas.
1600 Begin nitrogen transfer.
1800 Level meter resistance 1.32 kΩ. Stop nitrogen transfer.
1830 Stop evacuating mixing chamber lines. Pressure of G2 615 mbar.
Start cryocleaning mixture through cold trap 2. Valve 6 open 13.8%.