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2014/08/17

1310 Fill LN2 cold trap full.
1725 G1 and G2 still >180mbar. After monitoring 1K pot temperature and mixing chamber temperature for 30 minutes, 1K Pot oscillated between 1.591K and 1.600K, and mixing chamber oscillated between 896.5mK and 895.6mK.
1750 Replace He4 Rotary Pump with Scroll Pump to pump out 1K Pot.
1805 Current 1K Pot temperature: 1.557K. G1 and G2 at ~190mbar due to increased temperature during pump switch, but dropping. Mixing chamber temperature: ~990mK. Will leave overnight to see if changed pump has any effect.