Aperture sized disc shaped end caps of a ferromagnetic shield fo

Details Aperture sized disc shaped end caps of a ferromagnetic shield fo Aperture sized disc shaped end caps of a ferromagnetic shield fo

1985-03-25

1987-02-24

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

335299, 324320, H01F 700

Patent

active

046460454

ABSTRACT:
A shield for a MR magnet is provided comprising a cylindrical shell of magnetic material surrounding the MR magnet. The cylindrical shell is situated so that its longitudinal axis is coaxial with the magnetic axis of the MR magnet. Two disk shape end caps of magnetic material are secured to either end of the cylindrical shell. The end caps each define a central aperture extending longitudinally through the disk, with the radial extent of each of the apertures sized so that the perturbation of the field in the working volume of the MR magnet due to the cylindrical shell is compensated for.

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