Effects of Boundary Current on Electromagnetic Dispersion Characteristics for a Relativistic Electron Beam

XIAO Jixiong (肖集雄); ZENG Zhong (曾中); XIA Donghui (夏冬辉); WANG Zhijiang (王之江); LIU Changhai (刘昌海)

doi:10.1088/1009-0630/18/1/09

Plasma Science and Technology > 2016 > 18(1): 51-57. > DOI: 10.1088/1009-0630/18/1/09

XIAO Jixiong (肖集雄), ZENG Zhong (曾中), XIA Donghui (夏冬辉), WANG Zhijiang (王之江), LIU Changhai (刘昌海). Effects of Boundary Current on Electromagnetic Dispersion Characteristics for a Relativistic Electron Beam[J]. Plasma Science and Technology, 2016, 18(1): 51-57. DOI: 10.1088/1009-0630/18/1/09

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Effects of Boundary Current on Electromagnetic Dispersion Characteristics for a Relativistic Electron Beam

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

Funds: supported by the National ITER Project Foundation of China (Nos. 2013GB106001 and 2013GB106003)

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Received Date: August 28, 2015

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Abstract

Abstract

With betatron oscillation characteristics of the electron beam and ion channel effect taken into account, dispersion characteristics of electrostatic modes and TM modes for a relativistic electron beam guided by ion channel are studied. Dispersion relations are derived and solved numerically to investigate the dependence of the dispersion characteristics for electrostatic modes and TM modes on the betatron oscillation frequency and the ratio of the relativistic electron beam radius to the waveguide radius. The effects of the boundary current on the dispersion characteristic of the TM modes and the interaction between the betatron modes and TM modes are analyzed. When considering the boundary current, for a strong ion channel, a new low-frequency branch of the TM modes arises and the interaction frequency between the betatron modes and the TM01 modes is increased with the same parameters.
- dispersion characteristics,
- electromagnetic eigenmodes,
- betatron oscillation,
- ion channel

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References

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