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1. (WO2009123593) HOLLOW BEAM ELECTRON GUN FOR USE IN A KLYSTRON

Pub. No.:    WO/2009/123593    International Application No.:    PCT/US2008/004373
Publication Date: Oct 8, 2009 International Filing Date: Apr 3, 2008
IPC: H01J 25/14
Applicants: FERGUSON, Patrick
Inventors: FERGUSON, Patrick
Title: HOLLOW BEAM ELECTRON GUN FOR USE IN A KLYSTRON
Abstract:
A klystron has a hollow beam electron gun that has a circular planar electron emitting surface. A hollow electron beam is directed from the electron gun through a plurality of drift tubes, resonant chambers and magnetic fields to a collector. The hollow electron beam does not experience significant radial movement and can operate at a lower beam voltage which reduces the required length of the RF interaction circuit and lowers the risks of RF arcing.