Patent ID: 7473914
Filing Date: 2009-01-06
Classification: H01J,H05H

Abstract:
1. An apparatus for producing an annular electron beam in a THz radiation application comprising: a cathode for generating electrons, a cavity, the cavity having an annular shape and operable to receive the electrons; an energy input coupled to the cavity, where the energy input is operable to supply Radio Frequency (RF) energy at the cavity; and an energy output coupled to the cavity and operable to receive accelerated electrons from the cavity and operable to output the accelerated electrons as an annular electron beam, wherein the cavity comprises a first cavity and a second cavity, and wherein the energy input comprises a first energy input and a second energy input, the first energy input supplying a first Radio Frequency (RF) energy to the first cavity, and the second energy input supplying a second RF energy to the second cavity.