RE: AMMRL: Brrrrrrr

From: hsin <hsin.wang_at_sci.ccny.cuny.edu>
Date: Fri, 5 Nov 2010 11:11:06 -0400

Josh,

About the possible need for reshimming, we recently used an updated
3D-shimming program (gxyzshim) from Varian. That has taken a lot of pain
out of the process and we did get pretty satisfactory results in a short
time.
BTW do you have to shut down a cold probe or cryoprobe?

Hsin

--
Hsin Wang
NMR Facility Manager
City College of New York, CUNY
212-650-5831
Hsin.wang_at_sci.ccny.cuny.edu
> -----Original Message-----
> From: Josh Kurutz [mailto:jkurutz_at_northwestern.edu]
> Sent: Tuesday, November 02, 2010 5:08 PM
> To: AMMRL
> Subject: AMMRL: Brrrrrrr
> 
> Hi all,
> 
> For two upcoming holiday weekends, our facilities people need to shut
> off our power, HVAC air and compressed air for two or three days at a
> time. Shutting the spectrometers down to compensate for the loss of
> power and compressed air is a big inconvenience, but one that's easily
> managed. However, with no HVAC heat for the room, and with a not-so-
> well-insulated exterior roof and one exterior wall, our lab is likely
> to get rather cold - potentially near freezing in a worst-case
> scenario, considering the typical outdoor temps in Nov/Dec Chicago.
> 
> What are the risks we face? The temperature drop is clearly out of
> spec for performance purposes, but the instruments will be off, so we
> won't really care about that. How cold does the room have to be before
> we get concerned about damage, like magnets losing vacuum, or other
> odd things like that? Do the magnets need substantial reshimming after
> such an episode? Has anyone else experienced such a temperature drop
> in the lab? If so, do you have a plan or helpful advice that you could
> share?
> 
> Thanks.
> 
> - Josh
> 
> 
> Josh Kurutz, Ph.D.
> Instructor and Senior Scientist for NMR
> IMSERC, Chemistry Department
> Northwestern University
> 2145 Sheridan Rd.
> Evanston, IL 60208-3113
> 847-467-1949
> fax: 208-978-2599
> Facility: www.chem.northwestern.edu/imserc
> NMR Blog: www.imserc-nmr.org
> Twitter feed: twitter.com/imserc_nmr
> Other: www.joshkurutz.com
> 
> 
> 

Received on Fri Nov 05 2010 - 05:11:20 MST