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2011/09/22

0914 IVC P=3.4e-4mbar. It has been here for ~ 12 hours. Temperature has been at 4.2K. Add 20mW to the MC to warm up the tower. MC temperature went up to 4.5K.
0922 Close IVC, pumping station pressure drops to 4.7e-7mbar. Pump is fine. Tighten all the wing nuts, pressure is still at 3.4e-4mbar.
0923 1K pot speedivalve was shut very tight, but the temperature was 4.55K. Not sure if this is from the exchange gas cooling or the speedivalve is demaged. MC temperature starts to drop from 4.5K. Cooling from pumping liquid He?
1208 IVC pressure 3.4e-4mbar. Isolate pumping station.
1233 IVC Pressure 3.4e-2mbar. MC X12004 dropped from 4.53K to 4.50K. Where is the cooling power from? There might be a leak.
1237 Open the pumping station again.
1321 IVC P=3.4e-4mbar. MC X12004=4.53K.
1330 Can not pump the IVC down below 3.4e-4mbar. I'll go ahead and condense the mixture and see what will happen.
1334 Start 1K pot, start condensing mixture.
1419 Stop 1K pot. 1K pot temperature went up to 2.7K. I don't think this is going to work.
1545 Warm up. Bubble helium into main bath to aid evaporation.
1905 Lower dewar. Warm up IVC overnight.
1915 Fill N2 cold trap full.