Particle-in-cell simulation of ion-acoustic solitary waves in a bounded plasma

• 作 者: Lin Wei Bo Liu Fang-Ping Wang Heng Zhang Wen-Shan Duan
• 机 构: College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China
• 出 处: 中国物理B（英文版）
• 发表日期: 2021年3期
• 关键词: ion-acoustic solitary waves particle-in-cell simulation bounded plasmas

We study some nonlinear waves in a viscous plasma which is confined in a finite cylinder.By averaging the physical quantities on the radial direction in some cases,we reduce this system to a simple one-dimensional model.It seems that the effects of the bounded geometry(the radius of the cylinder in this case)can be included in the damping coefficient.We notice that the amplitudes of both Korteweg-de Vries(KdV)solitary waves and dark envelope solitary waves decrease exponentially as time increases from the particle-in-cell(PIC)simulation.The dependence of damping coefficient on the cylinder radius and the viscosity coefficient is also obtained numerically and analytically.Both are in good agreement.By using a definition,we give a condition whether a solitary wave exists in a bounded plasma.Moreover,some of potential applications in laboratory experiments are suggested.