2018-04-10 Cool Down Analysis
From Nuclear Physics Group Documentation Pages
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:
| 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
