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2013/09/29

0405 Mixing chamber temperature has gradually increased over the last three hours. Turn on helium gas to pressurise dewar and fill main bath with liquid helium.
0435 Helium transfer complete. Helium liquid level 43.0%. Continue to evacuate IVC.
2130 Fill N2 cold trap full.
Mixing chamber temperature 10.8 K. IVC pressure 2.2E-6 mbar. Start 1 K pot, temperature 1.75 K.
2230 Pump mixture into dump in preparation for condensation.
2345 Pressure of mixture in dump 686 mbar. Adjust needle valve to stabilise 1 K pot temperature at 1.85 K. Commence manual condensation procedure through nitrogen cold trap 1.