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The influence of magnetic field on the beam quality of relativistic electron beam long-range propagation in near-Earth environment

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Plasma Science and Technology 2021年第11期23卷 42-49页

作者： Jianhong HAO Xi WANG Fang ZHANG Qiang ZHAO Jieqing FAN Bixi XUE Zhiwei DONG North China Electric Power University Beijing 102206People's Republic of China Institute of Applied Physics and Computational Mathematics Beijing 100094People's Republic of China

In recent years,it has been proposed to use satellite-mounted radio-frequency(RF)accelerators to produce high-current relativistic electron beams to complete debris removal ***,when simulating the long-range propagation(km-range)process of the electron beam,it is difficult to directly use the particle-in-cell method to simultaneously consider the space charge effect of beam and the influence of the geomagnetic *** to these limitations,in this paper,we proposed a simplified *** ps-range electronic micropulses emitted by the RF accelerator were transmitted and fused to form a ns-range electron beam;then,combined with the improved moving window technology,the model was constructed to simulate the long-range propagation process of the relativistic electron beam in near-Earth ***,by setting the direction of movement of the beam to be parallel,perpendicular and at an inclination of 3°to the magnetic field,we analyzed and compared the effects of the applied magnetic fields in different directions on the quality of the beam during long-range *** simulation results showed that the parallel state of the beam motion and magnetic fields should be achieved as much as possible to ensure the feasibility of the space debris removal.

关键词： space debris relativistic electron beam long-range propagation geomagnetic field radio frequency accelerator

Wave growth rate in a cylindrical metal waveguide with ion-channel guiding of a relativistic electron beam

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Chinese Physics B 2010年第12期19卷 234-241页

作者：李海容唐昌建王顺金 School of Physics Science and Technology Sichuan University College of Science University of Science and Technology Liaoning

This paper addresses the formulae and numerical issues related to the possibility that fast wave may be grown when a relativistic electron beam through an ion channel in a cylindrical metal waveguide. To derive the dispersion equations of the beam-wave interaction, it solves relativistic Lorentz equation and Maxwell＇s equations for appropriate boundary conditions. It has been found in this waveguide structure that the TM0m modes are the rational operating modes of coupling between the electromagnetic modes and the betatron modes. The interaction of the dispersion curves of the electromagnetic TM0m modes and the upper betatron modes is studied. The growth rates of the wave are obtained, and the effects of the beam radius, the beam energy, the plasma frequency, and the beam plasma frequency on the wave growth rate are numerically calculated and discussed.

关键词： relativistic electron beam plasma ion channel dispersion relations wave growth rate

Influence of two-stream relativistic electron beam parameters on the space-charge wave with broad frequency spectrum formation

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Plasma Science and Technology 2018年第3期20卷 10-18页

作者： Alexander LYSENKO Iurii VOLK Sumy State University Sumy 40007 Ukraine

We developed a cubic non-linear theory describing the dynamics of the multiharmonic spacecharge wave（SCW）, with harmonics frequencies smaller than the two-stream instability critical frequency, with different relativistic electron beam（REB） parameters. The self-consistent differential equation system for multiharmonic SCW harmonic amplitudes was elaborated in a cubic non-linear approximation. This system considers plural three-wave parametric resonant interactions between wave harmonics and the two-stream instability effect. Different REB parameters such as the input angle with respect to focusing magnetic field, the average relativistic factor value, difference of partial relativistic factors, and plasma frequency of partial beams were investigated regarding their influence on the frequency spectrum width and multiharmonic SCW saturation levels. We suggested ways in which the multiharmonic SCW frequency spectrum widths could be increased in order to use them in multiharmonic two-stream superheterodyne free-electron lasers, with the main purpose of forming a powerful multiharmonic electromagnetic wave.

关键词： space-charge wave relativistic electron beam two-stream instability parametric

Modulational Instability of Ion—Acoustic Waves in a Warm Plasma with a relativistic electron beam

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Communications in Theoretical Physics 2003年第4期39卷 465-468页

作者： XUEJu－Kui LANGHe PhysicsandelectronicsEngineeringCollege NorthwestNormalUniversityLanzhou730070China

The modulational instability of ion-acoustic wave in a collisionless, unmagnetized plasma consisting of warm ions, hot isothermal electrons, and relativistic electron beam is studied. A modified nonlinear Schr?dinger equation including one additional term that comes from the effect of relativistic electron beam is derived. It is found that the inclusion of a relativistic electron beam would modify the modulational instability of the wave packet and could not admit any stationary soliton waves.

关键词： warm plasma relativistic electron beam ion-acoustic waves modulational instability

THEORETICAL ANALYSIS FOR THE relativistic electron beam IN A CENTRIFUGAL ELECTROSTATIC FOCUSING SYSTEM

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Journal of electronics(China) 1988年第2期5卷 148-153页

作者：张世昌 Department of Physics Chengdu Institute of Radio Engineering

A fundamental analysis of negative-mass instability in the interaction between a relativisticelectron beam and TE mode in a centrifugal electrostatic focusing system is given.A kinetic theory ispresented and correspon... 详细信息

关键词： electron optics Electrostatic focusing system relativistic electron beam

Multi-layer structure formation of relativistic electron beams in plasmas

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Plasma Science and Technology 2022年第2期24卷 10-16页

作者： Xiaojuan WANG Zhanghu HU Younian WANG School of Physics Dalian University of TechnologyDalian 116024People's Republic of China

A two-dimensional electromagnetic particle-in-cell simulation model is proposed to study the density evolution and collective stopping of electron beams in background *** show here the formation of the multi-layer structure of the relativistic electron beam in the plasma due to the different betatron frequency from the beam front to the beam ***,the nonuniformity of the longitudinal wakefield is the essential reason for the multi-layer structure formation in beam phase *** influences of beam parameters(beam radius and transverse density profile)on the formation of the multi-layer structure and collective stopping in background plasmas are also considered.

关键词： multi-layer structure beam phase space relativistic electron beam plasma based beam dump PIC

7.8 GHz power generation device design using a rectangular dielectric-loaded waveguide

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Chinese Physics B 2009年第6期18卷 2445-2451页

作者：路志刚宫玉彬魏彦玉徐进高鹏王文祥 School of Physical electronics University of Electronic Science and Technology of China

In this paper, we present a design where a bunched relativistic electron beam traversing inside the rectangular dielectric-loaded （DL） waveguide is used as a high power microwave generation device. Two kinds of methods of calculating the electromagnetic （EM） field excited by a bunched beam are introduced, and in the second method the calculation of EM pulse length is discussed in detail. The desired operating mode is the LSM11 due to its strong interaction with the electron beam. For the designed 7.8 GHz operating frequency, with a 100 nC/bunch drive train of electron bunches separated by 0.769 ns, we find that high gradient （〉 30 MV/m） and high power （〉 160 MW） can be generated. An output coupler is also designed which is able to extract the generated power to standard waveguides with a 94% coupling efficiency.

关键词： dielectric-loaded rectangular waveguide high power relativistic electron beam

Analysis of undulator radiation with an electromagnet undulator

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Chinese Physics C 2014年第7期38卷 135-138页

作者： Vijay Huse Bramh Prakash G. Mishra School of Physics DAVV Indore- 452001 (M. P.) India

In this paper we discuss the theory of undulator radiation in an electromagnet undulator. We discuss the spectral properties of undulator radiation when electrons are injected off the undulator axis. This paper highlights the distinctive features of the radiation spectrum from electromagnet undulators, as compared to PPM undulators.

关键词： undulator electromagnet undulator radiation spectrum relativistic electron beam

“Cold” dispersion relation of corrugated waveguide filled with plasma immersed in a finite magnetic field

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Chinese Physics B 2003年第5期12卷 532-537页

作者： LiWei WeiYan-Yu XieHong-Quan LiuSheng-Gang GongMa-Li DepartmentofPrecisionInstruments TsinghuaUniversityBeijing100084China StateKeyLaboratoryofHighPowerVacuumelectronics UniversityofElectronicScienceandTechnologyofChinaChengdu610054China

A general dispersion equation of a partially filled plasma corrugated waveguide immersed in a finite magnetic field is presented. When the guiding magnet Bo →∞ or 0, this equation can be reduced to the results obtai... 详细信息

关键词： finite field plasma-filled waveguide relativistic electron beam ion-channel