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MicrowavesOFF
NMRUsually, it should be on "Take Data" (check with the Target Expert on Shift)
Fridge
  • Only the Backing Pump (Rotary Vane pump) should be running, and the rest of the roots pumps should be OFF
  • Maintain the fridge LHe level between 50% and Heat-Ex Bottom.

  • In other words, let the fridge level drops down to 50% and then refill it up to Heat-Ex Bottom by opening the run-valve (then close it).
  • The fridge pressure should be on PID control at 100 Torr (see the table below).
  • Adjust the fridge RUN/Bypass valve between 0.5 turns (for a slow fill) or 2 turns (for a relatively quick fill), and close it when

  • the fridge fill is complete and continue to monitor the fridge level and refill when the level reaches back to 50%.
    See
this link: Ensure the magnet has enough LHe.		Magnet

  • Discuss with the Target Expert when to implement Switching from Production Mode to Hold Mode
Magnet
  • Ensure the magnet has enough LHe.
  • Ensure Magnet LN2 level is above 50%, if not refill it.
QT System
  • Ensure the purifier LN2 level is above 50%, if not refill it.
  • Ensure both liquefiers
are producing


Outlet Flows



How to check and control
Fridge8 slm (should be on the PID controlled for maintaining 100 Torr by Auto Control with Pressure) → How to control the Fridge Return flow
Separator       20 slmHow to control the Separator Return flow
Magnet     ~7 (on pressure PID at 0.9 psi)(link to a page)

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Transitioning from the Hold mode to the Production Mode

################# I think the links below are too much information for the Target Operator manual, can be suitable for the target expert manual ####

Conditions

  1. Fridge parameters when the fridge is in Hold ModeQT system conditions when the fridge is in Hold Mode
  2. Magnet conditions when the fridge is in Hold Mode
  3. Cryo-control parameters / conditions when the fridge is in Hold Mode
  4. Microwave parameters / conditions when the fridge is in Hold Mode
  5. Target Lifter conditions when the fridge is in Hold ModeUVA-NMR conditions when the fridge is in Hold Mode