Patent ID: 6847168
Filing Date: 2005-01-25
Classification: H01J

Abstract:
1. A multiple beam RF device comprising: a housing having a central Z axis, said housing enclosing a plurality of electron beam tunnels, each said beam tunnel having a conductive inner surface, and each said beam tunnel further comprising a sequence of drift tubes and drift tube gaps, said beam tunnels arranged about said central Z axis of said housing, and said housing including a plurality of apertures, one said aperture for each said electron beam tunnel; a plurality of electron guns equal to said plurality of said electron beam tunnels, each said electron gun producing an electron beam passing uniquely through a respective one of said electron beam tunnels; a magnetic field applied to each said electron beam, said magnetic field having a variation of less than 5% over the extent of said electron beam tunnels; each said electron gun having a respective cathode for the generation of electrons, a respective anode for the acceleration of said electrons, and a respective focus electrode for the focusing of said electron beams; a magnetic field corrector adjacent to each said electron gun cathode for correcting said magnetic field such that said cathode surface has a magnetic field which is everywhere perpendicular to each said cathode surface.