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2011/04/24

1136 Filled LN2 Cold Trap.
1430 Removed foam and finished installing nine layers of 1-inch HDPE.
Figure 1: Polyethylene sheets around top of IVC.
polyethylenebaffles.jpg
1440 Stop evacuating IVC at pressure 3E-5 mbar in preparation for leak check.
1500 Bakcground He leak rate 7.7E-9 mbar l/s.
Leak rate varies between 7.1E-9 mbar l/s and 8.7E-9 mbar l/s: no leak.
Evacuate dewar.
1930 Dewar raised.
1950 Flush main bath with He gas. Background He leak rate of 6E-9 mbar l/s; rises to 6.8E-9 mbar l/s: no leak.
2045 Fill IVC with 1.2 mbar of N2 gas.
Start LN2 transfer.
2345 Resistor resistance 1.32 kΩ. Stop LN2 transfer. Mixing chamber temperature 200 K.
2355 Fill N2 cold trap full.