Cylindrical NMR bias magnet apparatus employing permanent magnet

Details Cylindrical NMR bias magnet apparatus employing permanent magnet Cylindrical NMR bias magnet apparatus employing permanent magnet

1987-06-24

1988-07-19

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

324318, 29599, 335296, H01F 702

Patent

active

047588136

ABSTRACT:
NMR bias magnet apparatus employing permanent magnets and methods therefor are provided in accordance with the teachings of the present invention. According to the present invention a plurality of insulating sleeves which may be rotated are disposed about the periphery of a structure having a curvilinear cross section such as a cylinder. Each of the plurality of insulating sleeves are filled with stacks of slabs of permanent magnet material forming slugs and having an anisotropic axis of magnetic orientation aligned at an azimuth corresponding to a=2.phi.. The length of slug sections or even of individual slabs within each sleeve may be varied for purposes of introducing desired harmonics, as may the manner in which each sleeve is filled, so long as quadrature symmetry is maintained.

REFERENCES:
patent: 4549155 (1985-10-01), Halbach
patent: 4614930 (1986-09-01), Hickey et al.
patent: 4675609 (1987-06-01), Danby et al.

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