- Check the outside gHe pressure and make sure it is below 90 psi. If it's equal, near or above, then relief it's pressure down to ~80 psi.
- Check with Target Expert on Shift whether the REGX green hand valve is fixed to some pressure during the previous fill.
- Set the liquefier to "Manual" mode.
- Navigate to the liquefier page on the HMI screen.
- Open SVP(A/B)
- Navigate back to the "Overview Screen".
- Start pre-cool phase: Open VPC → Open VJV(A/B) → Monitor TX1, TX2, TX3
- After ~8mins: Open magnet-bypass (hand-valve right next to the magnet flow controller) → Open VJVT on the HMI screen.
- After ~1min: Close VPC and monitor magnet pressure.
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** Note: If the REGX green hand valve is fixed (check with Target Expert on Shift), then do not change it: just proceed with step #10 *****
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> If you need to change the pressure difference between the magnet and the Dewar then use the REGX all the time to maintain the pressure difference that you need (eg: ~4psi) - After a couple of minutes, you will observe that the magnet pressure drops down suddenly and stay around ~1.4-1.5 psi (this indicates that LHe is flowing to the magnet after the pre-cooling of the last part of the transfer line).
- Fill the magnet until the level shows ~44% → Open VPC → Close VJVT → Close VJV(A/B) → Close Magnet bypass hand valve. Make sure that you leave the VPC open to capture all the boil-off from the transfer line until it is warm (check TX1).
- Navigate to the liquefier page on the HMI screen and close SVP(A/B) → Switch the Liquefier to "Liquefy mode".
- Calculate the transfer efficiency of the transfer using https://e906-gat1.fnal.gov/data-summary/e1039/ (see the following screenshot as an example), and write an elog entry on UVA elog.
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