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The small signal gain of the square helix TWT has been calculated based on the improved tape model. It is clearly shown that the square helix TWT possesses higher peak gain than that of the equivalent round helix TWT, which indicates higher output power under the identical device length.
This paper presents a 0.22THz big beam-tunnel folded-waveguide (FWG) traveling-wave tube (TWT) with a phase-velocity taper. The big beam tunnel was applied in order to reduce the processing difficulty and increase the capability of the direct current power. And the input and output coupling structures and attenuator were simulated and the entire tube transmission characteristic was analyzed by employing...
A novel slow wave structure with low work voltage, high work current, compact structure was proposed by using radial spiral waveguide. The dispersion and transmission character was analyzed by computer simulation, and its work voltage was obtained, which could be as low as several hundred Volts. As the emitter face of cylinder gun larger than ordinary TWT's, it is possible to produce a high current...
In this study we report on a development of electron optical systems including electron gun, focus system and depressed collector for sheet beam vacuum electron devices (VED). To support the requirement of the electron-wave interaction, we aim to produce a beam with current density of approximate 200A/cm2 and an aspect ratio of 6:1. A PCM magnet stack is used for the focusing of the beam in the slow...
In this paper, we study the novel sheet electron beam gun by using CST simulation. We can find that the rectangular sheet electron beam gun can easily generate the rectangular sheet electron beam, its electrode shape and cathode focusing electrode angle have obvious influences on the performances of the rectangular sheet electron beam, such as its height and current density. The simulation results...
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