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.Â
> 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.Â
> 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-Zwanziger via 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!!!)  Â=
PO BOX 15000Â Â Â Â Â Â Â Â Â =
  Â
> Halifax, NSÂ 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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Received on Mon Feb 24 2025 - 08:16:46 MST