Dear Ivan,
which kind of magnet is this exactly? In my humble opinion rebuilding it only
makes sense if it's a flat-bottom unshielded 600 with aluminium bottom plate -
these may, especially in humid climates and experiencing considerable condensation
down the nitrogen heat sinks, see some (contact) corrosion at the bottom main seal.
The same may be true if you do lots of low temperature work which may lead to
condensation around the black bore flanges.
If your magnet is either a round-bottom shielded or unshielded magnet (whose
main body consists of two stainless steel shells) then I would leave it alone -
specifically if your lab doesn't happen to run a helium recycling plant. Way
too expensive (1000 l helium plus a good two weeks worth of specialized work)…
Cheers
Bert
> Am 08.11.2024 um 19:50 schrieb ik54 via groups.io :
>
> Hi all,
> We have a 600 MHz Inova that was installed in its current location in 2010.
> We are looking into upgrading the console and there was a suggestion that,
> after 14 years at field, it would be prudent to have the magnet rebuilt,
> i.e. de-energized, warmed, seals replaced, cooled and re-energized, as part
> of the upgrade, even if the magnet is performing within original specifications.
> My natural reaction would be to leave a good magnet alone, but I recently had
> an Oxford YH300 lose vacuum and quench after 20 years at field, so I decided
> to seek the wisdom of this crowd via this anonymous Google form:
> https://docs.google.com/forms/d/e/1FAIpQLSeLLYN6dQa84638zBwcNIgzCuYhMtthT8u51YJZkmxdINB7qA/viewform?usp=sf_link
>0
> You can view the results here:
https://docs.google.com/spreadsheets/d/1v70FNMRMzepXB69yGs_vJQYpYROY15OSm2V6Cz2SnaI/edit?usp=sharing
>
> Thanks for your help!
> Ivan
>
> PS: Send me an email if you want a Mercury plus 300 with a year hold Oxford.
>
> --
> 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
> (he/him)
> nmr.chem.cornell.edu
>
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Received on Mon Nov 11 2024 - 10:42:06 MST