2018-04-10 Cool Down Analysis

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:

The table's caption

Time	Process	Comment
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.

Note: Due to connection problems the separator flow wasn't reading all the time. The separator was woking from 10:30 am to 10:30 pm, which means that any 0 reading in the separator flow during that time is a false reading.

Magnet Temperatures and Helium lost estimations

Fridge Temperatures during the complete day

Fridge Temperatures during the cooling process

Fridge Temperatures when the nose was at 1.12 K

Fridge Temperatures when the nose was at 1.9 K

Target Temperatures during the complete day

CCS3 and Vapor Pressure measurements

CCS3 and Pumps Flows

Shells Pressure and CCSF1 in the Fridge

04/10/2018 Magnet Precool with LN2