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2013/08/24

0150 G2 pressure 684 mbar: mixture recovered. Turn off mixing chamber heater.
0215 Commence helium transfer. Helium liquid level 10.1%.
0235 Fill N2 cold trap full.
0240 Close gate valve and condenser line speedivalve to isolate fridge. Close nitrogen cold trap 1 speedivalve and all valves on IGH. Commence sryocleaning mixture through nitrogen cold trap 2.
0305 Cease helium transfer. Helium liquid level 90.9%.
0410 Pump mixture into dump in preparation for condensation.
0430 Start 1 K pot.
0440 Temperature of 1 K pot 1.88 K. Open nitrogen cold trap 1 speedivalve. Open gate valve and condenser line speedivalve. Mixture in dump 689 mbar. Start manual condensation procedure through nitrogen cold trap 1.
0530 Valve V12A fully open: manual condensation procedure complete. Mixture left in dump 364 mbar: approximately 325 mbar of mixture in fridge.
0600 Reduce temperature of 1 K pot to 1.73 K.
1800 Fill N2 cold trap full.
Mixing chamber temperature 1.81 K. Temperature of 1 K pot 1.72 K and steady. Pressures in G1 & G2 at around 40-50 mbar. Mixture has condensed. Commence manual circulation procedure.
1820 Valve V6 fully open. Manual circulation procedure complete. Wait for mixing chamber to reach base temperature.