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2012/08/26

0030 Fill N2 cold trap full.
1430 Mixing chamber temperature 97.8 mK, still thermometer 4.48 kΩ, cold plate thermometer 13.6 kΩ. Pressures in P1, G1 & G2 are 0.12 mbar, 50 mbar & 66 mbar respectively. Temperature of 1 K pot is 1.5 K.
Increase temperature of 1 K pot to 1.6 K.
Fed Cricket 4 pellets.
1443 Filled LN2 cold trap.
1555 Mixing chamber temperature 95.1 mK, still thermometer 4.45 kΩ, cold plate thermometer 13.5 kΩ. Pressures in P1, G1 & G2 are 0.13 mbar, 55 mbar & 70 mbar respectively. Temperature of 1 K pot is 1.63 K.
Increase 1 K pot temperature to 1.7 K.
1615 Begin LHe transfer (28.4%).
1645 End LHe transfer (82.4%).
1825 Mixing chamber temperature 94.8 mK, still thermometer 4.39 kΩ, cold plate thermometer 13.4 kΩ. Pressures in P1, G1 & G2 are 0.13 mbar, 57 mbar & 69 mbar respectively. Temperature of 1 K pot is 1.71 K.
Perhaps still is dry. Bleed some mixture from dump; G2 rises to 122 mbar before falling again. As expected, mixing chamber temperature rises to 108 mK.
2220 Mixing chamber temperature has been oscillating between 94 mK and 97 mK for the last few hours. Current temperature is around 95 mK for mixing chamber, still thermometer yields 4.39 kΩ, cold plate thermometer reads 13.4 kΩ. Pressures in P1, G1 & G2 are 0.14 mbar, 53 mbar & 65 mbar. Temperature of 1 K pot is 1.71 K.
2225 Bleed a little more mixture from dump; G2 rises to 135 mbar before falling again. As expected, mixing chamber temperature rises to 112 mK before falling again.
Fill N2 cold trap full.
2230 Fed Cricket 4 pellets.