2018-04-10 Cool Down Analysis
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04/12/2018 Fridge Cooldown
The fridge was cool-down starting from room temperature on April 12. The steps that day can be summarized as:
|10:30 am - 2 pm||Cooling down the separator||Both needle valves closed and Separator pump flow constant at ~ 5 slm|
|2 pm - 5 pm||Nose cooldown to 1.2 K.||The needle valves were opened (both). The roots were on When the temperature in the nose decrease bellow 4 K, the bypass valve was closed and the heat exchanger was opened slightly.|
|5 pm - 10 pm||Thermal equilibrium conditions ~1.9 K.||The bypass valve was closed and the heat exchanger was opened slightly. The roots were off and a secondary small roughing pump was pumping the cryostat space.||10 pm - 12 am||System off.||The needles valve were close and the separator pump was off.|
Magnet temperatures and Helium lost estimations.