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首页> 外文期刊>Review of Scientific Instruments >Robust, easily shaped, and epoxy-free carbon-fiber-aluminum cathodes for generating high-current electron beams
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Robust, easily shaped, and epoxy-free carbon-fiber-aluminum cathodes for generating high-current electron beams

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This paper presents the construction of carbon-fiber-aluminum (CFA) cathode by squeezing casting and its applications for generating high-current electron beams to drive high-power microwave sources. The fabrication process avoided using epoxy, a volatile deteriorating the vacuum system. These cathodes had a higher hardness than conventional aluminum, facilitating machining. After surface treatment, carbon fibers became the dominator determining emission property. A multineedle CFA cathode was utilized in a triode virtual cathode oscillator (vircator), powered by a approx450 kV, approx400 ns pulse. It was found that 300-400 MW, approx250 ns microwave was radiated at a dominant frequency of 2.6 GHz. Further, this cathode can endure high-current-density emission without detectable degradation in performance as the pulse shot proceeded, showing the robust nature of carbon fibers as explosive emitters. Overall, this new class of cold cathodes offers a potential prospect of developing high-current electron beam sources.

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