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

doi:10.1088/1674-1056/abccb1

Abstract 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.

Keywords: ion-acoustic solitary waves particle-in-cell simulation bounded plasmas

Received: 11 September 2020
Revised: 30 October 2020
Accepted manuscript online: 23 November 2020

PACS:	52.25.Dg	(Plasma kinetic equations)
	52.35.Fp	(Electrostatic waves and oscillations (e.g., ion-acoustic waves))
	52.35.Sb	(Solitons; BGK modes)
	52.65.Rr	(Particle-in-cell method)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11965019 and 11847142).

Corresponding Authors: ^†Corresponding author. E-mail: duanws@nwnu.edu.cn

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Lin Wei(位琳), Bo Liu(刘博), Fang-Ping Wang(王芳平), Heng Zhang(张恒), and Wen-Shan Duan(段文山) Particle-in-cell simulation of ion-acoustic solitary waves in a bounded plasma 2021 Chin. Phys. B 30 035201

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

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