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Title: A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier

Abstract

A nonlinear model for the numerical simulation of terahertz serpentine waveguide traveling-wave tube (SW-TWT) is described. In this model, the electromagnetic wave transmission in the SW is represented as an infinite set of space harmonics to interact with an electron beam. Analytical expressions for axial electric fields in axisymmetric interaction gaps of SW-TWTs are derived and compared with the results from CST simulation. The continuous beam is treated as discrete macro-particles with different initial phases. The beam-tunnel field equations, space-charge field equations, and motion equations are combined to solve the beam-wave interaction. The influence of backward wave and relativistic effect is also considered in the series of equations. The nonlinear model is used to design a 340 GHz SW-TWT. Several favorable comparisons of model predictions with results from a 3-D Particle-in-cell simulation code CHIPIC are presented, in which the output power versus beam voltage and interaction periods are illustrated. The relative error of the predicted output power is less than 15% in the 3 dB bandwidth and the relative error of the saturated length is less than 8%.The results show that the 1-D nonlinear analysis model is appropriate to solve the terahertz SW-TWT operation characteristics.

Authors:
;  [1]; ;  [1]
  1. Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190 (China)
Publication Date:
OSTI Identifier:
22408352
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFIERS; COMPUTERIZED SIMULATION; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTROMAGNETIC RADIATION; ELECTRON BEAMS; FIELD EQUATIONS; GHZ RANGE; HARMONICS; INTERACTIONS; NONLINEAR PROBLEMS; RELATIVISTIC RANGE; SERPENTINE; SPACE CHARGE; THZ RANGE; TRAVELLING WAVE TUBES; WAVE PROPAGATION; WAVEGUIDES

Citation Formats

Li, Ke, Cao, Miaomiao, Institute of Electronics, University of Chinese Academy of Sciences, Beijing 100190, Liu, Wenxin, and Wang, Yong. A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier. United States: N. p., 2015. Web. doi:10.1063/1.4917526.
Li, Ke, Cao, Miaomiao, Institute of Electronics, University of Chinese Academy of Sciences, Beijing 100190, Liu, Wenxin, & Wang, Yong. A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier. United States. https://doi.org/10.1063/1.4917526
Li, Ke, Cao, Miaomiao, Institute of Electronics, University of Chinese Academy of Sciences, Beijing 100190, Liu, Wenxin, and Wang, Yong. 2015. "A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier". United States. https://doi.org/10.1063/1.4917526.
@article{osti_22408352,
title = {A nonlinear analysis of the terahertz serpentine waveguide traveling-wave amplifier},
author = {Li, Ke and Cao, Miaomiao and Institute of Electronics, University of Chinese Academy of Sciences, Beijing 100190 and Liu, Wenxin and Wang, Yong},
abstractNote = {A nonlinear model for the numerical simulation of terahertz serpentine waveguide traveling-wave tube (SW-TWT) is described. In this model, the electromagnetic wave transmission in the SW is represented as an infinite set of space harmonics to interact with an electron beam. Analytical expressions for axial electric fields in axisymmetric interaction gaps of SW-TWTs are derived and compared with the results from CST simulation. The continuous beam is treated as discrete macro-particles with different initial phases. The beam-tunnel field equations, space-charge field equations, and motion equations are combined to solve the beam-wave interaction. The influence of backward wave and relativistic effect is also considered in the series of equations. The nonlinear model is used to design a 340 GHz SW-TWT. Several favorable comparisons of model predictions with results from a 3-D Particle-in-cell simulation code CHIPIC are presented, in which the output power versus beam voltage and interaction periods are illustrated. The relative error of the predicted output power is less than 15% in the 3 dB bandwidth and the relative error of the saturated length is less than 8%.The results show that the 1-D nonlinear analysis model is appropriate to solve the terahertz SW-TWT operation characteristics.},
doi = {10.1063/1.4917526},
url = {https://www.osti.gov/biblio/22408352}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 4,
volume = 22,
place = {United States},
year = {Wed Apr 15 00:00:00 EDT 2015},
month = {Wed Apr 15 00:00:00 EDT 2015}
}