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Summary form only given. In contrast with conventional thermoionic cathodes traveling wave tubes (TWT), the TWT employing field emitter array (FEA) cathodes are expected higher efficiency, with more compact size and lighter weight. When applying FEAs as the cathodes of the TWTs, many problems are to be considered and among them, the beam control and focusing of electron guns is the most principal...
This paper describes the structure, the fabrication process and the test of an FEA electron gun. A three-dimensional electromagnetic simulation program MAFIA was used to design the FEA electron gun, and the electron beam trajectory was simulated under initial condition of emitted electron half angle of 30 degrees. The designed FEA electron gun, Fig. 1 shows its photo, includes cathode, Wehnelt electrode,...
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