Abstract

A klystrode oscillator cavity is designed using annular electron beam in the C-band frequency that can be easily scaled to S and X bands. Beam electrons are assumed pre-modulated and injected into the toroidal cavity in the shape of thin reentrant resonator with the grid structure built in the beam entrance. We optimize the beam conversion efficiency via the MAGIC code in the range of sixty to seventy percent with the fundamental TM01-mode which is fine tuned by the 3D HFSS code. The annular electron beam has a merit to permit the center coupling to the adjacent cavity to enhance and stabilize the beam pre-modulation in addition to increased power handling capability.

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