It’s not just the walls but if you have support beams in the room try
to have them designed/laid out so that they are symmetrical around the magnets.
Again less problem with shielded systems.
My advice get involved with the architects. You will be surprised how much
they love learning about this stuff. Many of them may have dealt with MRI
systems and so will have some awareness of the issues.
David Jones
Associate Professor
Dept. Of Pharmacology
University of Colorado
School of Medicine
Tel (303)-724-3600
On Feb 24, 2025, at 9:16 AM, Ulrich via groups.io wrote:
Hallo,
da war viel richtiges dabei!
Hello - we had our AV III 600 at foor level 4. So we had seen there some nice
artefacts at 6 Hertz. This was the shaking by the building.
Now this system was moved to the cellar - on a concrete plate. Once the cryoshims
are 'updated' - because the location was moved and also the surrounding walls
and bars have changed too.
The other AV 600 was also moved - this was the unshielded one. We put some extra
material into the ceiling before - these sheets of Weicheisen-Metall - keeping
the stray field out of the seminar rooms above. Also this shielding has eaten
only one Ampere. The magnet was shifted 'cold' but the magnetic field was down.
When reestablishing this - the engineer has to put one Amper more into the coil,
to get the resonance back. Then it was once more shimmed by the cryo shims.
This magnet was replaced by a new shielded Ascend 18.8 Tesla magnet. Still
the ceiling was kept in there. Shielding the seminar rooms from the new system.
This was all no problem changing the locations. But you need the experts to do
this properly. We moved 5 magnets and systems from different floors to the
groundplate - now all is save.
Viele Grüße vom Bodensee,
Ulrich Haunz
Am Montag, Februar 24, 2025 16:38 CET, schrieb "Michael Groves via groups.io":
Hi Ulli,
I agree that as long as you stay sufficiently far away, you should be fine.
Normally big static things such as structural members aren't as big a problem
as big mobile things like elevators. Even if you can't get to an ideal
solution, usually you can figure out a good enough configuration to make things
work right. And cryoshims can usually be adjusted to compensate for things
like that as well.
Cheers,Mike
On Monday, February 24, 2025 at 08:15:21 AM MST, Ulrike Werner-Zwanzigervia groups.io wrote:
Dear Colleagues,
Dalhousie is planning a new building, which will also house the NMR facility.
We just learned that a changed plan is to build the new building using structural
steel (not concrete), and the question was raised, whether this will be a problem
for the NMR operation.
While this may not be ideal, we likely have no choice in this matter, but I
would appreciate any experiences or advice you can give me. (I couldn't find
anything in the archives). The magnets can be moved sufficiently inside the
room so that their 5 Gauss lines can be kept away from the walls. My feeling
is as long as we stay sufficiently far away, we should be fine. Do you agree?
Happy resonating,
Ulli
--
Dr. Ulrike Werner-Zwanziger
Adjunct Professor
Department of Chemistry, NMR-3,
Dalhousie University
6245 Castine Way (!!!new address!!!) PO BOX 15000
Halifax, NS B3H 4R2
e-mail: Ulli.Zwanziger_at_Dal.ca
Tel. 1 902 494 8085
FAX: 1 902 494 1310
--
=========================
Ulrich Haunz, Dipl.-Ing. (FH)
NMR-Spektroskopie
Raum L 710, L 807
NMR-Center M520, M521, M527
Postfach M 715
Fachbereich Chemie
Universitaet Konstanz
78457 Konstanz
Tel.: +49 (0)7531 88-4261 -> M521 Bruker Avance NEO 800
Tel.: +49 (0)7531 88-4422 -> L807 JEOL Lambda 400
Tel.: +49 (0)7531 88-4955 -> L710 Bruker AVIII HD 400
Tel.: +49 (0)7531 88-4956 -> M520a Bruker AVIII 600
Tel.: +49 (0)7531 88-4957 -> M527 Bruker AVIII 400 Automation
Tel.: +49 (0)7531 88-4958 -> M520 Bruker AVIII 400 WB
Tel.: +49 (0)170 9153213
FAX : +49 (0)7531 88-3898
=========================
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