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2012/08/22

0045 Mixing chamber temperature rose to 102 mK. Start single-shot test.
0330 Fill N2 cold trap full.
1000 Fed Cricket 3 pellets.
1005 Filled LN2 cold trap.
1225 Turn on mixing chamber heater, power 10 mW.
1255 Turn off 1 K pot.
1505 Start helium transfer. Helium liquid level 3.2%.
1525 Turn off mixing chamber heater.
1556 End LHe transfer (86.3%).
1610 Helium leak rate jumps to 1.2E-5 mbar l/s upon opening up the IVC. The helium leak rate then begins to fall gradually, reaching 1E-5 mbar l/s after a couple of minutes. Isolate leak checker and evacuate IVC with turbo pump overnight.
1732 Fed Cricket 4 pellets.
2330 He-4 leak rate 2.7E-8 mbar l/s. High leak rate earlier today may have been due to helium transfer.
Lack of He-3 external leak prevents He-3 calibration.