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2012/09/03

0035 Fill N2 cold trap full.
Fed Cricket 3 pellets.
Mixing chamber temperature 4.91 K and falling. 1 K pot temperature 4.5 K.
1005 Fed Cricket 3 pellets.
1030 Filled LN2 cold trap.
1245 Start helium transfer. Helium liquid level 0.7%.
1335 Stop helium transfer. Helium liquid level 72.3%.
2235 Mixing chamber temperature 6.97 K and rising slowly. Helium leak rate in pipes leading to IVC 1.2E-9 mbar l/s. Open up IVC and helium leak rate rises to 1.5E-6 mbar l/s. There doesn't appear to be an increase from running the 1 K pot.
Isolate IVC and leak checker. Pump out lines to IVC with turbo pump.
2245 Start cryocleaning mixture through nitrogen cold trap 2. Fill N2 cold trap partially full.
2340 Fill N2 cold traq full.
Fed Cricket 4 pellets.