You have to push the helium fast enough to stay liquid into the magnet.
Depending on the transfer lines you might have to go up to 3-4 lbs psi.
New lines with strong vacuum can transfer much lower.
________________________________
> From: main_at_ammrl.groups.io on behalf of falcocobra via groups.io
> Sent: Tuesday, September 9, 2025 1:09 PM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] How to diagnose helium icing
At what pressure is the fill being done? 60-80L taking more than an hour do=
es sound a little slow, but if he is doing the fill at 1 psi, that doesn't =
sound out of the ordinary.
--
Paulo Falco Cobra | Scientist II - Facility Manager
NMRFAM<
https://nmrfam.wisc.edu/> - University of Wisconsin Madison
E paulo_at_nmrfam.wisc.edu<mailto:paulo_at_nmrfam.wisc.edu>
P (608) 265-3303
A 433 Babcock Drive, Madison, WI. 53706
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Received on Tue Sep 09 2025 - 12:27:31 MST