Traveling wave tube with periodic permanent magnet focused multiple electron beams
AssigneeCalabazas Creek Research, Inc.
InventorsR. Lawrence Ives, Michael Read, Patrick Ferguson
Life of this patent
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Abstract
A coupled cavity traveling wave tube has periodic permanent magnet (PPM) RF cavity structures, each of which has a plurality of permanent magnets placed substantially equidistant from a central axis, and which are outside the extent of a plurality of electron beam tunnels arranged substantially equidistant from the central axis and within the extents of the plurality of permanent magnets. Each coupled cavity RF structure is formed by adjacent ferrous polepieces and a cylindrical wall which is beyond the extent of one or more coupling apertures which couple RF energy from one coupled cavity structure to an adjacent RF cavity.
Claims20
A coupled cavity traveling wave tube having:
- a plurality of beam transport structures on a central axis, each beam transport structure having:
- a plurality of magnetic field generators positioned a substantially uniform radial distance from said central axis, said magnetic field generators positioned a substantially uniform distance from adjacent magnetic field generators;
- said plurality of magnetic field generators generating a magnetic field oriented in a common direction of said central axis;
- a plurality of beam tunnels positioned a substantially uniform radial distance from said central axis;
- an RF cavity formed by said ferrous polepiece and a substantially cylindrical wall;
- each said RF cavity coupled to an adjacent RF cavity by one or more apertures in the ferrous polepiece, each aperture being at least one of a radial slot, a circumferential slot, or a rectangular aperture;
- where RF is caused to propagate parallel to the central axis through the one or more apertures in the ferrous pole piece and is thereafter directed to travel perpendicular to the beam tunnels before exiting parallel to the central axis through the one or more apertures in an adjacent ferrous polepiece;
- each said beam transport magnetic field generator having an opposite polarity from an adjacent magnetic field generator.
A multi-beam coupled cavity (CC) traveling wave tube (TWT) comprising:
- a plurality of RF cavity structures arranged in a sequence about a central axis, each of said RF cavity structures comprising:
- a plurality of magnetic field generators, each said magnetic field generator producing a magnetic field parallel to said central axis;
- a plurality of beam tunnel apertures parallel to said central axis;
- a plurality of waveguide apertures, each said waveguide aperture having a segment parallel to said central axis and a segment perpendicular to said central axis and intersecting an associated beam tunnel;
- each said RF cavity magnetic field generator having an opposite polarity than a magnetic field generator of an adjacent RF cavity structure
- and where said segments of a particular waveguide aperture of said RF cavity structure are isolated from other segments of said RF cavity structure.
Dependencies are inferred from the claim text.