To follow-up on what Sameer said, my initial thought was an ice blockage below
the stinger as well. You were fairly thorough in your write-up, so I
assume you would have mentioned this, but out of curiosity, did the stinger
go all the way into the magnets to the usual depths? I agree with him
that it would seem rather suspicious to have blockages on both magnets, but
was it possible during the install/hook-up to the recovery system that the
trunk was positive with atmosphere (or dirty helium, at least) and could
have back-flowed into both magnets?
Absent that, it does seem there is a great deal of back pressure and a
picture of the wider exhaust line used during transfers might help diagnose.
Good luck.
Regards,
David
David Richardson, Ph.D.
Director, NMR Facility and Cryogenic Services
Office of Research
University of Central Florida
david.richardson_at_ucf.edu
407-823-2961
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Received on Fri Apr 18 2025 - 16:54:50 MST