Hi Luke,
You mention it’s a new combination with a BCU-05 in the mix. Could
this be sample convection arising from temperature gradients? If so, running
topshim with the convcomp option could help.
Best,
Sameer
--
Sameer Al-Abdul-Wahid, Ph.D. | Manager
Nuclear Magnetic Resonance Centre | University of Guelph
519-824-4120 ext. 58914 | s.wahid_at_uoguelph.ca
http://nmr.uoguelph.ca/
> From: main_at_ammrl.groups.io on behalf of Fulton, Luke
> Date: Friday, September 20, 2024 at 13:30
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: [AMMRL] topshim sluggish for some solvents #Bruker #NMR_Aquisition_Software
Hi all,
An instrument has me stumped with an odd symptom.
Automated shimming with topshim is taking an abnormally long time to complete.
It always finishes without any errors, and spectra look fine, but the extended
duration may cause us to alter our reservation rules if we can’t find a fix.
It’s affecting all research groups, and the only observed pattern so far is
an apparent solvent dependence. For example, D2O is fast ~30s and CDCl3 is slow,
frequently over 10 minutes. So far we’ve lowered the 2H pulse power in the
prosol table and didn’t notice any difference. Checked gradients (attached),
and while surprising the differences don’t match trends with our solvent tests.
Haven’t noticed anything off putting in lock phase or field. The shim file
is updated weekly after nitrogen fills with lineshape and sensitivity samples, during
which I haven’t noticed any anomalies while using topshim gui. The trouble came
after recent hardware changes, so I’m hoping it’s due to a setting/calibration
but am not sure where to look.
For context: We had 300 and 400 MHz magnets with AVANCE microbay and AVANCE
III nanobay respectively. A new 400 MHz magnet and console will be installed
next month. We converted the AVANCE III nanobay from 400 MHz to 300 MHz. The
AVANCE microbay retired a few months ahead of schedule when its PSU failed. The
AVANCE III nanobay now has the old preamps from the AVANCE microbay, and a new
lock transceiver board. We brought the shim stack along with the console when
moving to the lower field magnet. We have a BCU 05 setup but the room temp bbo
probe doesn’t have working temp control, probably for some years. So
it’s mostly old equipment stitched together into a new combination.
TopSpin 3.6.5
Does this dilemma sound familiar to anyone?
Kind regards,
Luke
==
Luke Fulton, PhD
CHEM BLDG R003
NMR Core Facility Director
Unit 3060
COR2E & Department of Chemistry
55 N Eagleville Road
University of Connecticutâ
Storrs, CT 06279
email: fko24003_at_uconn.edu
(alias): luke.fulton_at_uconn.edu
mobile: (603) 953-5275
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Received on Fri Sep 20 2024 - 13:41:56 MST