Page History

...

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 this link: How to open/close the fridge run-valve	Magnet	Ensure the magnet has enough LHe. these links (a) How to Open or Close Fridge Valves (b) How to identify the fridge LHe level is at Heat-Ex Bottom Discuss with the Target Expert when to switch from the Hold Mode to the Production Mode: Transitioning from the Hold mode to the Production Mode
Magnet	Ensure the magnet has enough LHe. implement Switching from Production Mode to Hold Mode Ensure Magnet LN2 level is above 50%, if not refill it.
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 are producing 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.

Outlet Flows

How to check and control

Fridge

Check with the Target Expert among the following options:
(1) Set the gv-bypass

8 slm (should be on the

PID controlled for maintaining

100

400 Torr by Auto Control with Pressure

) →

(2) Fully open gv-bypass

How to control the Fridge Return flow (GV and GV Bypass)

Separator

20 slm

How to control the Separator Return flow

Magnet

~7 (on pressure PID at 0.9 psi)

(link to a page)

Other useful instructions:

Steps for Transitioning from the Hold mode to the Production Mode

Space shortcuts

Page tree

Versions Compared

Old Version 18

New Version Current

Key

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

Conditions