Method for passive control of magnet hemogeneity

Details Method for passive control of magnet hemogeneity Method for passive control of magnet hemogeneity

1998-12-23

1999-11-30

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

335302, H01F 4102

Patent

active

059920068

ABSTRACT:
A method and apparatus for passively shimming a magnet. A magnetic field produced by the magnet is measured and modeled in the form of a Legendre polynomial expansion having a predetermined number of harmonic terms. The degree of non-homogeneity in the measured field is determined by examining the harmonic terms. A shim is then designed to correspond to a magnitude change of a harmonic term of the polynomial expansion in order to improve the homogeneity of the magnetic field. A metal plate is connected to or placed near a pole of the magnet, the shim is placed against the metal plate, and a plastic plate is attached to the metal plate such that the shim is held in place in a predetermined location against the metal plate.

REFERENCES:
patent: 4023263 (1977-05-01), Postma
patent: 5539368 (1996-07-01), Yamashita

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