Accession Number : ADD013293

Title :   Periodic Permanent Magnet Structure with Increased Useful Field.

Descriptive Note : Patent Application, Filed 24 Aug 87,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Clarke, John P

Report Date : 24 Aug 1987

Pagination or Media Count : 22

Abstract : A device is disclosed which uses permanent magnets to manipulate charged particle beams, such as those employed in traveling wave tubes, wigglers, and undulators. Tapered pole pieces are inserted between magnets in a periodic permanent magnet array, and the taper is oriented away from the beam path. The magnets themselves may also be tapered, but the taper is oriented toward the beam path. Tapering is described according to the cross sections formed when the plane which contains the beam path intersects the magnets and pole pieces.

Descriptors :   *PATENT APPLICATIONS, *PERMANENT MAGNETS, TAPER, TRAVELING WAVE TUBES, PERIODIC VARIATIONS, MAGNETIC FIELDS

Subject Categories : Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE