Date: Wed, 25 Mar 2020 20:24:49 +0000
Hi All,
We always warm up our cryoprobes when we are out for an extended period. Over Christmas we are off for 10 days and warm them up on the last day. We warmed ours this time when we were told that we are going to be out for 2+ weeks. They use a lot of energy and if they are not going to be used for an extended period it just seems wasteful.
As for the idea of shutting down magnets, in addition to whatever damage it might cause the magnet, I would be more worried about whether we could get the necessary helium to bring them back up. I think that magnets can be left without shimming for an extended period unless your magnet drifts excessively. Gradient shimming does an amazing job, although you might have to supplement it with some hand shimming.
Stay well every one!!
Laurie
Laurine G. Galya, PhD
Senior Director, Discovery Analytical
Incyte Research Institute
1801 Augustine Cutoff
Wilmington, DE 19803
P: (302)498-6904
P: (302)498-6732 (Lab)
E: lgalya_at_incyte.com<mailto:lgalya_at_incyte.com>
[IRI logo]
From: Stolowich,Neal J. [mailto:stolowich_at_louisville.edu]
Sent: Wednesday, March 25, 2020 8:28 AM
To: Heather Schenck <hschenck_at_uwlax.edu>; ammrl_at_ammrl.org
Subject: [EXTERNAL] RE: AMMRL: another facility shutdown question - cold probes
CAUTION: EXTERNAL EMAIL
And what about cold probes- is everyone going warm during a prolonged shutdown?
I’ve kept mine cold for the first 10 days of our campus research wind down period, but effective tomorrow, all non-essential research must cease, and no one will be allowed in the dept (except for moi 😊)
Hope every one continues to be well!
Neal
Neal J Stolowich, PhD
NMR Facilities Manager
Department of Chemistry
University of Louisville
(502) 852-7894
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From: Heather Schenck <hschenck_at_uwlax.edu<mailto:hschenck_at_uwlax.edu>>
Sent: Sunday, March 22, 2020 5:50:49 PM
To: ammrl_at_ammrl.org<mailto:ammrl_at_ammrl.org> <ammrl_at_ammrl.org<mailto:ammrl_at_ammrl.org>>
Subject: AMMRL: another facility shutdown question
Beyond cryogen fills, I'm wondering if systems can be left without shimming for up to several months, or if it may be wise to keep a sample locked in the magnet for field stability, etc.
Recently energized magnets especially might be prone to faster shim drift, but I wondered how long a stable system can be left before shims are too bad to recover using routine procedures.
Feedback welcome, and I will try to share results with the group (unless requested not to). Thanks.
Heather
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