High-Field Permanent-Magnet Structures.
Patent Application, Filed 27 May 88,
DEPARTMENT OF THE ARMY WASHINGTON DC
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An azimuthally circumscribed section of a hollow hemispherical magnetic flux source i.e., a quarter-spherical or one eighth-spherical structure has a superconducting planar sheet abutting one flat face of the section and, at least, a second planar sheet of selected material e.g., paramagnetic or diamagnetic abutting another flat face of the section and perpendicular to the first sheet. The magnetic mirror image of the magnetic section in the diamagnetic superconductor plane and the virtual anti-mirror andor mirror images in the other perpendicular planes makes the central cavity appear magnetically exactly as if a complete magic sphere were its source. The central or working cavity is readily accessible through a hole in the first or second planar sheet.
- Electricity and Magnetism