Mitsubishi Denki Kabushiki Kaisha

Syunji Yamamoto

Tetsuya Matsuda

Masao Morita

Tadatoshi Yamada

A process and apparatus for correcting a crude magnetic field of a main field generator having correcting magnetic field generators associated therewith to produce a substantially homogeneous corrected field. The process comprises the steps of measuring the distribution of said crude magnetic field at a plurality of points, expressing the crude magnetic field at each of the plurality of different measured points by a polynomial equation which contains a main homogeneous magnetic field component, successively higher order inhomogeneous magnetic field components, and a residual, determining the magnetic field output for the correcting generators such that the successively higher order inhomogeneous magnetic field components of the crude magnetic field are completely cancelled by the magnetic field outputs, respectively, of the correcting generators, and producing and superpositioning on the crude magnetic field the determined magnetic field output from the correcting generators.

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Itami, Japan

Syunji Yamamoto