Dear All,
We have an actively shielded Oxford 600 magnet that we bought used in
2004. It was installed at our site in May 2004. The magnet quenched
spontaneously and without warning in July 2005. We had it re-energized
in August and it quenched again four weeks later. We re-energized it
again and that time it stayed at field until last night when it quenched
yet again without any warning.
I am also told that the magnet quenched 14 months after it was first
installed at it's original location, although everyone assumed that
quench occurred because it ran low on cryogens.
My questions are: What could possibly cause a magnet to quench once
every 14-16 months but work spectacularly well in between? If it was
your magnet, would you try to get it repaired? Buy a new one?
Re-energize it and hope this time it sticks?
I will summarize for the group if there's interest.
Thanks
Ivan
--
Ivan Keresztes, Ph.D.
Director, NMR Facility
Department of Chemistry and Chemical Biology, Cornell University
Baker Laboratory, Ithaca, NY 14853.
phone: (607) 255 0709, fax: (607) 255 4137, email: ik54_at_cornell.edu
Received on Tue Jan 09 2007 - 11:11:30 MST