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changes.mady.by.user M. A. Ishara Fernando

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changes.mady.by.user M. A. Ishara Fernando

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Owl-Shift
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
Day-Shift
  • Fill purifier LN2 space with LN2 → click here
  • Fill Magnrt LN2 space with LN2 → click here
  • Go through the Polarized Target Maintenance Record
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
Swing-Shift
  • Check whether both LHe liquefiers are producing with a rate of ~4 L/hr
  • Check the total consumption rate (Magnet return flow + Separator return flow + Main return flow), and estimate how long the magnet LHe will take to get to 0% (communicate this information on the discord channel via CCP computer)
    You can use this page: Combined Calculators (fnal.gov) or just calculate by-hand.
  • Check the total helium amount in the entire system using https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/total_LHe_stat.php, and communicate to the Target Expert if you notice a drop throughout the past 24 hrs.

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Idle Mode

Hold Mode

Production Mode


Basic Operations' Direct links

  1. How to control the Magnet Return flow
  2. How to control the Separator Return flow
  3. How to control the Fridge Return flow (GV and GV Bypass)
  4. How to Open or Close Fridge Valves
  5. Helium Liquefier (QT) System Summary
  6. Microwave Operation
  7. Roots pumps PLC interface
  8. How to identify the fridge LHe level
  9. How to fill LN2 to the Purifier and Magnet LN2 spaces 



Switching Between Modes

1. Transitioning from the Hold mode to the Production Mode
2. Transitioning from the Production Mode to the Hold Mode

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