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We analyzed the failure mechanism in miniature x-ray tubes with a gated carbon nanotube (CNT) field emitter. The miniature x-ray tube even with a small leakage current of field emission from the CNT emitters to the gate electrode has some distortion of the electron beam trajectory from the cathode to anode passage, causing a charging at insulating parts. The charging at the insulator spacer would...
The CNT emitter on metal tip (CNT-on-Tip) cathode can provide high-brightness electron beams due to its point-like electron emission sites. The triode type emitter with a gate electrode is prerequisite to an intensity-controllable X-ray. We simulated the trajectory of the emitted electron beams in the triode CNT-on-Tip and optimized the configuration to obtain ideal triode properties. Consequently,...
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