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Title: Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field

Abstract

A high efficiency relativistic backward wave oscillator working at a low guiding magnetic field is designed and simulated. A trapezoidal resonant reflector is used to reduce the modulation field in the resonant reflector to avoid overmodulation of the electron beam which will lead to a large momentum spread and then low conversion efficiency. The envelope of the inner radius of the slow wave structure (SWS) increases stepwise to keep conformal to the trajectory of the electron beam which will alleviate the bombardment of the electron on the surface of the SWS. The length of period of the SWS is reduced gradually to make a better match between phase velocity and electron beam, which decelerates continually and improves the RF current distribution. Meanwhile the modulation field is reduced by the introduction of nonuniform SWS also. The particle in cell simulation results reveal that a microwave with a power of 1.8 GW and a frequency of 14.7 GHz is generated with an efficiency of 47% when the diode voltage is 620 kV, the beam current 6.1 kA, and the guiding magnetic field 0.95 T.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024 (China)
Publication Date:
OSTI Identifier:
22600045
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAM CURRENTS; EFFICIENCY; ELECTRIC POTENTIAL; ELECTRON BEAMS; ELECTRONS; GHZ RANGE 01-100; LENGTH; MAGNETIC FIELDS; MICROWAVE RADIATION; MODULATION; OSCILLATORS; PHASE VELOCITY; RELATIVISTIC RANGE; SIMULATION; SURFACES

Citation Formats

Li, Xiaoze, Song, Wei, Tan, Weibing, Zhang, Ligang, Su, Jiancang, Zhu, Xiaoxin, Hu, Xianggang, Shen, Zhiyuan, Liang, Xu, and Ning, Qi. Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field. United States: N. p., 2016. Web. doi:10.1063/1.4954903.
Li, Xiaoze, Song, Wei, Tan, Weibing, Zhang, Ligang, Su, Jiancang, Zhu, Xiaoxin, Hu, Xianggang, Shen, Zhiyuan, Liang, Xu, & Ning, Qi. Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field. United States. doi:10.1063/1.4954903.
Li, Xiaoze, Song, Wei, Tan, Weibing, Zhang, Ligang, Su, Jiancang, Zhu, Xiaoxin, Hu, Xianggang, Shen, Zhiyuan, Liang, Xu, and Ning, Qi. Fri . "Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field". United States. doi:10.1063/1.4954903.
@article{osti_22600045,
title = {Design of a high efficiency relativistic backward wave oscillator with low guiding magnetic field},
author = {Li, Xiaoze and Song, Wei and Tan, Weibing and Zhang, Ligang and Su, Jiancang and Zhu, Xiaoxin and Hu, Xianggang and Shen, Zhiyuan and Liang, Xu and Ning, Qi},
abstractNote = {A high efficiency relativistic backward wave oscillator working at a low guiding magnetic field is designed and simulated. A trapezoidal resonant reflector is used to reduce the modulation field in the resonant reflector to avoid overmodulation of the electron beam which will lead to a large momentum spread and then low conversion efficiency. The envelope of the inner radius of the slow wave structure (SWS) increases stepwise to keep conformal to the trajectory of the electron beam which will alleviate the bombardment of the electron on the surface of the SWS. The length of period of the SWS is reduced gradually to make a better match between phase velocity and electron beam, which decelerates continually and improves the RF current distribution. Meanwhile the modulation field is reduced by the introduction of nonuniform SWS also. The particle in cell simulation results reveal that a microwave with a power of 1.8 GW and a frequency of 14.7 GHz is generated with an efficiency of 47% when the diode voltage is 620 kV, the beam current 6.1 kA, and the guiding magnetic field 0.95 T.},
doi = {10.1063/1.4954903},
journal = {Physics of Plasmas},
number = 7,
volume = 23,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2016},
month = {Fri Jul 15 00:00:00 EDT 2016}
}