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首页> 外文期刊>Plasma physics and controlled fusion >Dynamical characteristics of solitary waves, shocks and envelope modes in kappa-distributed non-thermal plasmas: An overview
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Dynamical characteristics of solitary waves, shocks and envelope modes in kappa-distributed non-thermal plasmas: An overview

机译：κ分布非热等离子体中孤立波，冲击和包络模式的动力学特性：概述

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摘要

Space plasmas provide abundant evidence of highly energetic particle population, resulting in a long-tailed non-Maxwellian distribution. Furthermore, the first stages in the evolution of plasmas produced during laser-matter interaction are dominated by nonthermal electrons, as confirmed by experimental observation and computer simulations. This phenomenon is efficiently modelled via a kappa-type distribution. We present an overview, from first principles, of the effect of superthermality on the characteristics of electrostatic plasma waves. We rely on a fluid model for ion-acoustic excitations, employing a kappa distribution function to model excess superthermality of the electron distribution. Focusing on nonlinear excitations (solitons), in the form of solitary waves (pulses), shocks and envelope solitons, and employing standard methodological tools of nonlinear plasmadynamical analysis, we discuss the role of excess superthermality in their propagation dynamics (existence laws, stability profile), geometric characteristics and stability. Numerical simulations are employed to confirm theoretical predictions, namely in terms of the stability of electrostatic pulses, as well as the modulational stability profile of bright- and dark-type envelope solitons.
机译：太空等离子体为高能粒子群提供了丰富的证据，导致了长尾非麦克斯韦分布。此外，如实验观察和计算机模拟所证实，在激光与物质相互作用过程中产生的等离子体演化的第一阶段是非热电子。这种现象可以通过kappa型分布进行有效建模。我们首先从原理上概述了超热对静电等离子体波特征的影响。我们依赖于离子声激发的流体模型，采用kappa分布函数来模拟电子分布的过热度。重点关注孤波（脉冲），冲击和包络孤子形式的非线性激发（孤子），并采用非线性等离子体动力学分析的标准方法工具，我们讨论了超热在其传播动力学中的作用（存在定律，稳定性分布） ），几何特征和稳定性。数值模拟被用来确认理论预测，即就静电脉冲的稳定性以及明和暗型包络孤子的调制稳定性分布而言。

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