Hello Jerry,
The transformer is designed to have maximum magnetic flux
linkages within itself and very small percentage of it is leaking out may
be 0.01 % and as distance increases the flux density reduces. Secondly, we
have to see,what kind of magnet you are using. If it is shielded magnet,
you need not worry at all. Merely keep distance of about 15 feet from the
transformer to be interference free. In case of normal unshielded magnet,
you should take precaution to install it away from the transformer. It
would be good idea to check the magnetic field with a gauss meter and keep
the NMR magnet where the magnetic field is around 0.36 gauss. Probably
this figure would be between 20 to 25 feet away from transformer. It is
better to take precaution or else you may have artifacts in
2D-experiments.
Good Luck.
L.S.Mombasawala.
NMR laboratory,
RSIC,
Indian Institute of Technology,
Powai, Mumbai 400 076.
__________________________________________________________________________
On Mon, 4 Feb 2002, jerry hu wrote:
>
> Dear Colleagues,
>
> For site planning, I need help with a specification for distance between
> large high power transformers (~3 MW) and NMR machines. Sharing your
> suggestion and experience is greatly welcome.
>
> Thanks,
> Jerry Hu
> ---------
>
> -------------------------------------------------------------------
> Jerry Hu, Ph.D. email: jghu_at_mrl.ucsb.edu
> RD Engineer Tel: (805)893-7914
> Materials Research Lab, UCSB Fax: (805)893-8502
> Santa Barbara, CA 93106
>
>
>
Received on Tue Feb 05 2002 - 23:39:08 MST