Hi all,
I'll soon be facing the dilemma of whether to move some old magnets
(400 & 500 MHz, unshielded) or try to replace them. They're basically
ok where they are, but they are 20-25 years old, which seems to be a
magnet's expected working life, and there's some concern that they
won't survive transport.
Ignoring for the moment the benefits of new, shielded magnets, I'd
like your help with this end-of-magnet-life issue.
A) Have you had experience moving old magnets? If so did you
encounter any problems, such as not being able to get it back up to
field?
B) Do any of you have magnets older than 25 years that are still
operational? If so, are there special problems, such as increased
cryogen usage, field drift, or shim difficulties, that you attribute
to magnet age?
C) If you have moved a magnet unsuccessfully, what was the mode of
failure?
D) What makes old magnets more fragile than new ones?
Thanks for your help.
- Josh
Josh Kurutz, Ph.D.
Technical Director, Biomolecular NMR Facility
University of Chicago
Gordon Center for Integrative Science, room W123C
929 E. 57th St.
Chicago, IL 60637
Office: (773) 834-9805
Spectrometer Room: (773) 702-4052
Cell: (773) 315-5732
Fax: (208) 978-2599
nmr.bsd.uchicago.edu
homepage.mac.com/jkurutz
www.joshkurutz.com
Received on Fri Feb 20 2009 - 04:58:12 MST