coondoggie writes: raditional high-powered cathode electron emitter-based equipment for high-bandwidth communications, security screening or imaging applications can run hot, significantly shortening the lifespan and usefulness of the equipment. A new program from the Defense Advanced Research Projects Agency called Advanced Cathode Development is looking to remedy that situation by developing what the agency calls "cold" cathode electron emitter technology that "can operate at a temperature of less than 1000 C.
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