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  1. Shut Down and Restart Procedures
  2. Filling LN2 on Purifier Dewar
  3. QT System Starting Procedure
  4. Liquefier Cleaning when Dewar contains LHe
  5. Cleaning QT purifier Helium-space (pumping-purging the purifier)
  6. Cleaning QT purifier LN2 space
  7. What to do when cold-heads "blockage" warning appear?
  8. Fixing dewar level indicator (related to (9))
  9. LHe Dewar cleaning procedure
  10. Cold-helium Circulation Procedure (Cooldown Transferline)
  11. Cleaning gHe outside tank using the purifier
  12. Resolving Liquefier Blocking Alarm when Liquefier is on Liquefy Mode
  13. Resolving Liquefier Blocking Alarm when Liquefier is on Idle Mode


Useful information

  1. The volume of an outside gHe tank: 1600 cubic feet
  2. 100 slm rate on Magnet FC is equivalent to ~ 192 LHe liters per day (i.e. assuming both LQ A and B are running)
  3. QT recommendation to keep system minimally pressurized: ~20 psi
  4. Running from 40 psi down to 20 psi would produce about 80 liquid litters and we should be able to do that in about 10 hours (assuming both LQ A and B are running).
  5. HR3.docx

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