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| Microwaves | OFF |
| NMR | Usually, it should be on "Take Data" (check with the Target Expert on Shift if there are issues) |
| Fridge | - Only the Backing Pump (Rotary Vane pump) should be running, and the rest of the roots pumps should be OFF
See Roots pumps PLC interface page - 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 100 400 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 these links
(a) How to open-close fridge-run-valve and fridge-bypass-valveOpen or Close Fridge Valves
(b) How to identify the fridge LHe level is at Heat-Ex Bottom
- Discuss with the Target Expert when to implement Switching from Production Mode to Hold switch from the Hold Mode to the Production Mode: Transitioning from the Hold mode to the Production Mode
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| Magnet | - Ensure the magnet has enough LHe.
- Ensure Magnet LN2 level is above 50%, if not refill it.
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| QT System | - Ensure the purifier LN2 level is and the magnet shield LN2 levels are above 50%, if not refill it.
See Helium Liquefier (QT) System Summary page to identify where to look at for those LN2 levels. - Ensure both liquefiers produce LHe with the rate of ~ 4 L/ hr (with an uncertainty +/- 0.3). If not, then contact the Target Expert on shift. You can use https://e906-gat1.fnal.gov/data-summary/e1039/target-par-preset/target-LHe-prod-rate.php
- Check LCW outlet Temperatures from the cold-head compressors and ensure all those temperatures are below 95 F. If any of those are. > 100 F then, report to the Target Expert immediately and follow Target Expert's instructions.
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Other useful instructions:
Steps for Transitioning from the Hold mode to the Production Mode
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