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Print this checklist and have it with you while proceeding with the following steps:


Preparation:

  1. Check the outside gHe pressure and make sure it is below 90 psi. If it's equal, near, or above, then relieve its pressure down to ~80 psi.
  2. Check with Target Expert on Shift whether the REGX green hand valve is fixed to some pressure during the previous fill.
  3. Connect to the Cryo Control Computer (via VNC: see Polarized Target System for SpinQuest at FNAL for the instructions)


Procedure:

  1. Set the liquefier to "Manual" mode.

  2. Navigate to the liquefier page on the HMI screen.

  3. Open SVP(A/B).


  4. Navigate back to the "Overview Screen".


  5. Start pre-cool phase:  Open VPC → Open VJV(A/B) → Monitor TX1, TX2, TX3

    1. Charts of TX1, TX2 & TX3:  https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/cool_down.php
    2. TX1 goes down below 100 K in 5 minutes.  If not, there should be a problem.

  6. After ~8mins: 
    1. Open the magnet-bypass valve (i.e. the black hand valve right next to the magnet flow controller),
    2. Open the Magnet Return flow, by changing the flow mode to "OPEN" on the "THCD_401_Main.vi" on the Cryo Control Panel, and
    3. Open VJVT on the HMI screen.

  7. After ~1min: Close VPC and monitor magnet pressure.


    **************************************************************************************************************************************
    ** 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 *****
    *****************************************************************************************************************************************
    > 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)
  8. 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).
  9. Fill the magnet until the level shows ~44%.
    1. Keep monitoring the liquid amount and the pressure at https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/transfer.php.
  10. Stop the fill if the level reached ~44% or any sudden change occurred during the transfer indicating a problem.
    1. Open VPC
    2. Close VJVT
    3. Close VJV(A/B)
  11. Navigate to the liquefier page on the HMI screen and close SVP(A/B) → Switch the Liquefier to "Liquefy mode".
  12. Wait for 1-3 minutes until the magnet pressure (on the HMI screen) goes down to 1 psi.
  13. Close the Magnet bypass hand valve.
  14. Change the mode of the Magnet Return flow from "OPEN" to "AUTO" on the THCD_401_Main.vi , and then click the "Automation" toggle switch.
  15. Make sure that you leave the VPC open, to capture all the boil-off from the transfer line until it is warm (check TX1). — We need not check TX1 but let VPC open, correct?
  16. 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.
    1. https://e906-gat1.fnal.gov/data-summary/e1039/target-all-auto.php?hh=2&DLLiqA0_Liquefier%2BA%2BPV_LI501&DLLiqB0_Liquefier%2BB%2BPV_LI501&Cryo%2BLevel_Magnet%2BLHe%2BLiter
  17. Get the parameters from the following link and save to a .csv file and upload to this folder:

Parameters for LQ_A: https://e906-gat1.fnal.gov/data-summary/e1039/target-par-table.php?Y0=2023&M0=01&D0=22&h0=22&m0=12&s0=00&Y1=2023&M1=01&D1=22&h1=23&m1=30&s1=00&par0=DLLiqA0_Liquefier+A+PV_PT503&par1=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_Magnet+Dewar+Pressure&par2=DLLiqA0_Liquefier+A+PV_LI501&par3=Cryo+Level_Magnet+LHe+Liter&par4=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_FMR&par5=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_TX1&par6=Cryo+Temperature_Cooldown+Line+TX2&par7=Cryo+Temperature_Cooldown+Line+TX3

Parameters for LQ_B: https://e906-gat1.fnal.gov/data-summary/e1039/target-par-table.php?Y0=2023&M0=01&D0=21&h0=19&m0=49&s0=00&Y1=2023&M1=01&D1=21&h1=20&m1=50&s1=00&par0=DLLiqB0_Liquefier+B+PV_PT503&par1=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_Magnet+Dewar+Pressure&par2=DLLiqB0_Liquefier+B+PV_LI501&par3=Cryo+Level_Magnet+LHe+Liter&par4=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_FMR&par5=DLSystem0_Helium+Supply+and+Return+Manifolds+PV_TX1&par6=Cryo+Temperature_Cooldown+Line+TX2&par7=Cryo+Temperature_Cooldown+Line+TX3

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