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2012/08/20

1005 Fed Cricket 3 pellets.
1032 Fill LN2 cold trap full.
1140 Pump mixture into dump in preparation for condensation.
1205 Pressure in dump 695 mbar. Start condensing mixture through nitrogen cold trap 1.
1300 Automatic condensation procedure completed. Mixing chamber temperature 2.28 K. Start circulating mixture.
1320 Valve 6 is fully open, but G1 & G2 pressures are rather high at 135 mbar and 141 mbar respectively. Should wait for these to drop before bleeding the remaining mixture out of the dump. Mixing chamber temperature is dropping at a fair rate, which is encouraging. Current mixing chamber temperature 750 mK and falling fast.
1410 Mxing chamber temperature is still decreasing, but has been rather slow for the last half-hour. Mixing chamber temperature 104 mK. Still thermometer 4.42 kΩ.
1455 Cooling appears to have stagnated. Mixing chamber temperature 94.2 mK. Stop automatic circulation procedure. Open valve 14 on IGH to bleed mixture out of dump. Pressure in G2 rises to 223 mbar, and tower temperature shoots up as expected.
1500 Mixing chamber temperature reaches 127 mK before starting to cool again.
1515 Mxing chamber started cooling at a faster rate than before extra mixture was added. Mixing chamber reached 111 mK, and was still cooling. Will start bleeding mixture into the fridge at regular intervals, keeping G2 below 200 mbar, until dump is empty.
1709 Begin LHe transfer (10.8%).
1738 End LHe transfer (75.3%).
1757 Filled LN2 cold trap.
1810 Fed Cricket 4 pellets.