>Has anyone noticed that their high field magnet is getting a 5 o'clock
>shadow? I recently noticed a stubble growing on the surface of the dewar
>(500 mhz) and at the top and bottom plate. Some of the particles were
>"big". If you have this problem you can remove most of the particles with
>a clothes type lint roller. Wide sticky tape also works good. I inspected
>some of the junk with a microscope and I could tell where some of them
>originated. One looked a little curly and like metal lathe turnings. We
>do have a machine shop several floors up. I am considering installing a
>sticky mat at the entrance...I wonder if anyone has done that. Magnets
>will be magnets.
We get this a bit on our UNITY-500. I used a sticky mat at another
job location for years--the NMR lab was close to a machine shop--
and it worked great.
----------------------------------------------------------
Charlie Fry Tel: (608)262-3182
Director, MR Facility Fax: (608)262-0381
Chem. Dept., Univ. Wisconsin
Madison, WI 53706 USA email: fry@chem.wisc.edu
----------------------------------------------------------