Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1983-12-14
1986-04-08
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324320, G01R 3320
Patent
active
045815801
ABSTRACT:
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.
REFERENCES:
patent: 3287630 (1966-11-01), Gang
patent: 3569823 (1971-03-01), Golay
patent: 4231008 (1980-10-01), Krueger
patent: 4339718 (1982-07-01), Bull
patent: 4456881 (1984-06-01), Compton
patent: 4486711 (1984-12-01), Frese et al.
patent: 4509030 (1985-04-01), Vermilyea
Cutter Lawrence D.
Davis Jr. James C.
General Electric Company
Snyder Marvin
Tokar Michael J.
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