H - Electricity – 01 – F
Patent
H - Electricity
01
F
317/29.6
H01F 7/20 (2006.01) G01R 33/3875 (2006.01)
Patent
CA 1257643
INTENTIONALLY NON-ORTHOGONAL CORRECTION COILS FOR HIGH-HOMOGENEITY MAGNETS ABSTRACT OF THE DISCLOSURE In the design of large electromagnets having high magnetic field uniformity requirements it is common practice to employ a set of correction coils and coil circuits, each coil being excited so as to correct for a specially defined symmetrically shaped error field. The error field is typically defined as certain terms in a spherical harmonic expansion for the field. The present invention proposes instead to provide a set of correction coil circuits in which the creation of a desired spherical harmonic is achieved by exciting a set of correction coils with a specified set of currents, and in which the same coils can further be used to create a spherical harmonic of substantially different symmetry by exciting the same coils with a different set of currents. In the present invention, a linear combination of spherical harmonic components may be effected, so as to increase the flexibility of operation and the correction capability of the magnet and correction coil structure.
469646
Company General Electric
Eckersley Raymond A.
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