Re: A Cautionary Tale
Jeff Walton (jhwalton@ucdavis.edu)
Wed, 30 Apr 1997 15:13:38 -0700
Rich is right. There was a case similar to this at one of my prior stops
where I was a post-doc. They had a leak detector with a diffusion pump and
LN2 trap. They pumped down the magnet once a week. They were able to
monitor the pressure increase each week. They took an embarassingly long
time to bring the magnet down and replace the O-rings, but it never
quenched. Please note that O-rings are not the only place a leak can
occur. Now that the magnet is down, I would do a complete leak check and
consider replacing the O-rings even if you don't find a leak there.
Also, as far as I know, there's nothing you can do to stop a quench. Just
leave the room and pray your magnet survives. Hope this one did.
Good Luck!
Jeff
Jeffrey H. Walton
UCD NMR Facility
University of California
Davis, CA 95616
(916) 752-7794 (office)
(916) 754-9064 (lab)
(916) 752-3516 (FAX)
jhwalton@ucdavis.edu
NMR Facility URL http://www.nmr.ucdavis.edu