Abstract
Low secondary and reflected primary electron emissions from the collector electrode surfaces are important for optimum collector efficiency and hence for high overall efficiency of microwave amplifier tubes used in communication satellites and in military systems. Ion sputter texturing effectively suppresses electron emission from the surface of pyrolytic graphite, a promising collector electrode material. In this paper we present secondary and reflected primary electron emission characteristics of sputter-textured pyrolytic graphite surfaces with microstructures of various sizes and densities. The microstructure with the lowest electron emission levels, which were less than those of soot, consisted of a dense array of tall thin spires.
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