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2013/07/22

0130 Mixing chamber temperature dropped below 4.8 K. Start pumping out exchange gas.
0255 Helium liquid level 97.1%. Helium transfer complete.
0530 Fill N2 cold trap full.
1015 Fill LN2 coldtraps full.
Mixture is still cryocleaning. We will allow it to continue cryocleaning for an hour before we being condensing the mixture.
1105 Cryocleaning has occurred for at least an hour. With G2=509mbar, begin pumping mixture to the dump to prepare for pumping on 1K Pot.
1112 Mixture pumped to dump. Currently G1=0.5mbar, G2=704.7mbar, P1=0.014mabr. IVC at 1.2E-6mbar; Isolate IVC. Close all valves on IGH, open V4 (He4 pump already on). Open needle valve 1/4 turn and speedivalve. Begin pumping on 1K Pot. Switch from exhaust to recovery.
1133 Begin condensing mixture.
1201 With 351.8mbar remaining in the dump, close V9 to isolate the dump (how did this finish so quickly?). Slowly open V12A; open fully once at 17%. Continue condensing mixture.
1236 Electrical Check OK.
1315 Begin circulating mixture.
1340 V6 opened all the way. Current Lakeshore/MC temp = 526mK and dropping.
1800 Mixing chamber temperature 90-92 mK. Reduce temperature of 1 K pot from 1.75 K to 1.57 K. Mixing chamber temperature drops to 87 mK.
Commence data acquisition.