Comaprison of two configurations of a novel high-power microwave generator is presented in this article. Coupling the beam-breakup instability with the transit-time effect of the electron beam in the cavity, rapid energy exchange between the electrons and cavity modes can occur. The dominant cavity modes in the axial and radial configurations are different but their growth rates are comparable. We found that the radial configuration can have a beam impedance of less than 10 approximately ega and are therefore more suitable for low-voltage and high power operation. Good agreements have been obtained between linear theory and simulation for both configurations.
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