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2013/03/13

0020 Finished 3 rounds of cleaning cold traps.
0111 Close all valves on IGH.
0118 Filled LN2 cold trap.
0128 Return cold traps to respective baths.
0131 Start 1 K pot and helium recovery.
0141 Open gate and condenser valves. Open V1, V13A, and V12A. Open V6 gradually.
0218 V6 opened all the way.
0545 Base temperature has stabilized to 57.8 mK.
1010 Fed Cricket 4 pellets.
1014 Filled LN2 cold trap.
1040 Begin LHe transfer (17.5%).
1135 End LHe transfer (94.7%).
1145 Re-powered boards. They seem fine.
G1 and G2 are increasing at a creeping rate. This seems to be standard behavior, and unfortunately there's not really an indication when all of a sudden the blockage develops.
1340 Around 1320, the temperature of the mixing chamber spiked, even though G1 and G2 seemed okay. The temperature increased to ~ 116 mK before we unplugged the boards. This may or may not have helped to lower the temperature. There weren't significant vibrations felt in the main bath, but upon unplugging the transfer port, the temperature dropped dramatically. Mixing chamber temperature is at 76 mK and dropping.
1721 Begin flashing detector for 1 hour, then cool down for 2 hours. Take three 30 min series at +/- 3 V for Dib 1/2, and then three 30 min series at -/+ 3 V for Dib 1/2. 6 seconds of flashing and 20 min cool down between each series. OR trigger for Qi channels (35 / 30 ADC bins for Dib 1/2 respectively) . Ba-133 source is out.
1807 Fill LN2 cold trap full.
1808 Fed Cricket 4 pellets.