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Calculation of beam-wave interaction of coupled-cavity TWT using equivalent circuit model

Bai Chun-Jiang Li Jian-Qing Hu Yu-Lu Yang Zhong-Hai Li Bin

Calculation of beam-wave interaction of coupled-cavity TWT using equivalent circuit model

Bai Chun-Jiang, Li Jian-Qing, Hu Yu-Lu, Yang Zhong-Hai, Li Bin
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  • Received Date:  28 November 2011
  • Accepted Date:  27 February 2012
  • Published Online:  05 September 2012

Calculation of beam-wave interaction of coupled-cavity TWT using equivalent circuit model

  • 1. National Key Laboratory of Science and Technology on Vacuum Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 60801029, 10876005, 60931001, 61071030, 10905009).

Abstract: A nonlinear model for the numerical simulation of coupled-cavity traveling wave tube is described. The model is based on the Curnow equivalent circuit from which the matrix equations for the fields of any single cavity can be obtained. And the model can be divided into the matrix equations, the motion equations and the space-charge field equations, in which the sever, dynamic tapering in the circuit and the multiple-frequency signal amplification can be also considered. The simulation is used to analyze the nonlinear AM-PM distortion and the intermodulation products of a coupled cavity TWT whose working frequencies range from 59 GHz to 64 GHz. And the analysis of the saturated output power within the frequency band is also included. Comparing the simulation results with the measurements, the percentage difference between the calculation results and the test results is less than 5%.

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