Purpose – The purpose of this paper is to present a 2.5‐dimensional (2.5‐D) frequency‐domain nonlinear computer model for the beam‐wave interaction of coupled‐cavity traveling wave tubes (CC‐TWTs). Design/methodology/approach – MKK (proposed by Malykhin, Konnov, and Komarov) equivalent circuit model is used to describe the coupled‐cavity slow‐wave structure. And the losses are taken into account in the MKK equivalent circuit. Instead of one‐dimensional (1‐D) disk model, the electron beam is divided into a set of discrete rays and the electron dynamics are treated using the three‐dimensional (3‐D) Lorentz force equations. Findings – The simulated result obtained show that the computer model can give a good predict for CC‐TWTs in V‐band. Practical implications – The computer model is capable of treating nonlinear problems. Compared with particle‐in‐cell simulation, the 2.5‐D frequency‐domain computer model spends less time. Besides, the 3‐D electron trajectory can be used to design high‐efficiency collectors for CC‐TWTs. Originality/value – The computer model is able to simulate nonlinear problems of coupled‐cavity TWT faster.
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering – Emerald Publishing
Published: Aug 26, 2014
Keywords: Electromagnetic CAD; Coupled‐cavity traveling wave tubes; Electromagnetic waves
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