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2010/08/14

Run Diary

0940 Fill N2 cold trap full
0943 Close gate valve, condenser speedivalve, V1, and V6 to isolate the fridge
0945 Start to pump the bath
0947 Isolate the pumping station and the vacuum gauge on it
IVC He BG 2.1E-9 cc/s
0951 Fill the bath with He gas, IVC He signal start to rise
0954 Stop He gas at G3=63mbar, IVC leak: 7.3E-9 cc/s
0955 IVC leak peak value: 7.3E-9 cc/s, starts to drop
Start to cleaning mixture
1010 IVC He signal keeps dropping slowly, 3.5E-9cc/s at the moment at G3=31mbar
1013 IVC He signal 3.2E-9 cc/s, at G3=28mbar
1015 Isolate bath, evacuate 1K pot line
1016 Evacuate and isolate 1K pot
1026 Put 0.16 mbar N2 exchange gas into IVC (1.4mbar in NW40 hose)
1032 Remove He recovery line, start liquid N2 transfer
1349 Stop liquid N2 transfer at resistor=1343Ω, put on ping pong ball