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2012/12/12

0930 Filled LN2 cold trap.
1020 Fed Cricket 3 pellets.
1036 Start automatic circulation process.
1215 End automatic circulation process. Fridge is stabilizing at about 66 mK.
1229 Lower 1 K pot temperature to 1.57 K.
1507 Pumping mixture to dump. Tried plugging in 2 DCRC boards and the fridge warmed up to 81 mK. Ran out of LHe anyway.
1802 Warmed up fridge with mixing chamber heater. Did a leak check at 10.9 K.
Background leak rate: 1.4E-8 mbar l/s.
IVC rate : 4E-9 mbar l/s.
1820 Fed Cricket 4 pellets.
2020 Mixing chamber temperature 15.1 K. Background helium leak rate in hose to IVC 3.6E-9 mbar l/s. Leak rate in IVC shot up to 3.3E-6 mbar l/s.
Evacuate IVC with turbo pump overnight. Leave mixing chamber heater on (power 20 mW).
2125 Fill N2 cold trap full.