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2011/02/25

1235 Fill N2 cold trap full.
1530 Stop cryocleaning mixture. Pump mixture into dump.
1535 Start 1 K pot.
1550 Start condensing mixture. Adjust needle valve until 1 K pot temperature is 1.773 K.
1745 Tower temperature 3.2 K. Stop condensing mixture; start circulation.
1955 Turn Still on: 6 mW.
2010 Tower temperature 82.7 mK. Seems to be stable. Wait for a while.
2030 Flash G9: LED1; current 500 μA; flash duration 100 μs; flash-off time 2.56 ms. Tower temperature peaks at 142 mK.
2040 Flash G8: LED1; current 600 μA; flash duration 100 μs; flash-off time 2.56 ms. Tower temperature peaks at 246 mK. Tower temperature did not increase by very much when current was at a 500 μA. Looking at the traces, both detectors are being flashed. Leave to flash overnight.
2145 Liquid helium level jumped from 17.2% to 17.6%. There seem to be some fluctuations, so these values can't be trusted. Seem to be losing 2% every hour, so might run out by 06:00 tomorrow.
Start LHe transfer.
2230 Stop LHe transfer. Helium liquid level 96.1%.
2250 Switch off Still.
Fill N2 cold trap full.