Periodic Permanent Magnet Structure with Increased Useful Field.
Patent Application, Filed 24 Aug 87,
DEPARTMENT OF THE ARMY WASHINGTON DC
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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.
- Electricity and Magnetism