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

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Checklist:

  1.  On QT-HMI ODH page ensure LL-106-N Shows < 75%. Ensure the level probe readout in the magnet power supply rack (cryoplatform) is ON, and the output from it to the PLC is ENABLE. Check with the Target Expert on Shift to find the level probe readout status.is reading the shield level and that it shows < 75%.
  2.  PT-106-N is below 15 psig (pressures above ~17.08 psig are not going to be read so we are blind above this value. Discussions about increasing the readout range will be done after the holidaysshield relieves at 35 psi, pay attention to not exceed that value).
  3.  PT-110-N reads a value between 20psig-60psig65psig.
  4.  Ensure EV-200-N is closed. It may have been left open earlier since the purifier was filled. If it is left open, then leave it open and then close it after Step #2 below.
  5.  Ensure VNFA on the purifier overview LN2 is CLOSED.
  6.  LN2 tank (Tank #54) outside has > 20 inwc level.
  7.  HCV13 (hand-valve at the tank) is CRACKED OPEN to about 1/2 turns from the fully closed position (on 12/22/2023 we decided to leave it at this position).
  8.  Note down the start time and the initial level for the elog entry.


Steps:

  1.  Open EV-102-N.
  2.  Open EV-100-N. (Then close EV-200-N if it was left open until now).
  3.  Monitor TE-104-N, TE-107-N, TE-108-N, and they should reach < 90 Kelvin.
    1. TE-108-N does not go below 150 K, as of 2024-01-01.
  4.  When the temperatures reaches below 90 Kelvin, Open EV-105-N to 24% or 26% (input '24' + press 'Enter') to maintain the PT-106-N at 30 psig. 
     Image Added
     You can see a number-pad appear on the screen to enter the value for the opening of EV-105-N. Enter the number, and remember to press the "ENTER" key.
     Image Added
  5.  Close EV-102-N.
  6.  Monitor PT-106-N and ensure it doesn't stay at the top value of 17.08 30 psig.
    1. Adjust EV-105-N (usually by +-1...2%) to keep PT-106-N around/below 17.08 30 psig.
    2. If the pressure doesn't fall back below 17.08 30 psig, then STOP the filling by Closing EV-100-N and Opening EV-102-N, then Close EV-105-N (input '0' + press 'Enter'). Note: If PT-106-N increases to 35 psig, then PRV401 will vent at 35 psig in the cave we need to avoid. 
  7.  Monitor LL-106-N reaching 90%.
  8.  Close EV-100-N.
  9.  Open EV-102-N.
  10.  Close EV-105-N  (input '0' + press 'Enter').
  11.  Note down the finish time the and final level for the elog entry.
  12.  Post a Fermilab elog entry regarding this fill (see the past elog entries for the format)
  13.  After ~4 hrs, ensure TE-104-N, TE-107-N, TE-108-N are at room temperature and then Close EV-102-N.

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