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- You will see an alarm when Tank B at 4.6 K, at that time ensure that the Dewar B pressure at 3psi and the Dewar A pressure at 5.5 psi.
This step needs some time estimate depending on how long each Dewar takes to reach the set pressure. - Monitor the magnet level reaching the seam (when Tank B is around ~4.8 K)
- Switch the Magnet level probe to "CONT".
- At right before the fill, open the run valve to 3 2 turns for 3 mins and put it back to 0.8 turns.
- Start pre-cooling by opening VJVA first (this is to pre-cool the line A assuming that the line A is relatively colder then we switch filling from B→A; we will have to pre-cool line B in the next step).
- When TX1 reaches ~100 K, then pre-cool line B by opening VJVB and close VJVA.
- Ensure TX1 ~100 K or below, then open Mag return bypass fully, open VJVT, and close VPC.
- Switch the Dewar B to Manual mode and set FC501 B to 45slm, and monitor FMR.
- Monitor until the Dewar B level reaches 12 L, and then open VJVA to pre-cool until it reaches 9 L.
- Close VJVB. Now you are filling from A. Magnet Pressure may have a pressure spike. After the pressure spike set Dewar A to Manual mode and set FC501A to 45slm.
- Switch LQ-B to Auto + Liquefy mode, and set the Dewar pressure back to 6.5 psi.
- Adjust the flow FC501A to keep FMR below 480slm, PC1 below 1.1 psi, and magnet pressure below 2.5 psi.
- At the end of the fill, Open VPC, Close VJVA, and VJVT. Also, ensure VJVB is closed.
- Switch LQ-A to Auto + Liquefy mode, and set the Dewar pressure back to 6.5 psi.
- Set the Magnet Bypass to pressure PID to 0.9 psi.
- Switch the Magnet level probe back to "HOLD" mode.
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