Dear AMMRL,
I would like to get input from those who operate complete helium recovery
systems that capture both NMR magnet boil-off and exhaust from magnet
refills.
1. During magnet refills, what is the typical pressure in the recovery
line? Does this pressure affect the fill efficiency (i.e., the volume of
liquid helium transferred to the magnet relative to the total volume
consumed)?
2. When refill exhaust is recovered, is the fill duration significantly
longer compared to conventional fills (where the exhaust is vented to
atmosphere) at the same source pressure? How does the fill efficiency
compare between the two cases?
3. What source dewar pressure do you typically use for magnet fills when
the exhaust is captured?
Your inputs are appreciated.
Cheers,
Jerry
-----------------------------------------------
Jerry Hu, Ph.D.
Technical Director, Project Scientist
Materials Research Lab, UCSB
Santa Barbara, CA 93106
Jerry.hu_at_ucsb.edu
(805)893-7914 (office)
(805)893-7940 (lab)
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Received on Thu Apr 02 2026 - 12:28:18 MST