Abstract

The phenomena concerning head-on collision between the two topological and non-topological solitons are investigated in unmagnetized and collisionless plasma system consisting of weakly relativistic cold positive (\(H^{+}\), \({Xe}^{+}\) and \(K^{+}\)) and negative (\(H^{-}\), \({SF}_{6}^{-}\), \(O_{2}^{-}\) and \(C_{7}F_{14}^{-}\)) ion species with superthermal electrons. To do this, the two-sided Korteweg–de Vries (KdV) equations are derived using extended Poincaré–Lighthill–Kue method. The solutions of KdV equations are obtained by solitary ansatz technique. Productions as well as collisional effects of non-topological and topological solitons are investigated taking the experimentally obtained plasma parameters into accounts. The study reveals that the nonlinearity of non-topological solitons become more pronounced for \(K^{+}-C_{7}F_{14}^{-}\) plasma as compared to the other ionic species plasmas. The masses and densities of negative ion species play a vital role on the potential profiles of topological solitons. A new type large amplitude wave is produced in the colliding region due to collision depending on plasma parameters.

Graphic abstract

中文翻译：

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对离子等离子体中离子声波的正面碰撞效应：拓扑和非拓扑孤子

摘要

在由弱相对论冷正（\（H ^ {+} \），\（{Xe} ^ {+}组成）的非磁化和无碰撞等离子体系统中研究了两个拓扑和非拓扑孤子之间的正面碰撞现象。\）和\（K ^ {+} \））和负数（\（H ^ {-} \），\（{SF} _ {6} ^ {-} \），\（O_ {2} ^ { -} \）和\（C_ {7} F_ {14} ^ {-} \））具有过热电子的离子物种。为此，可使用扩展的庞加莱—莱特希尔—库方法（Boincaré-Lighthill-Kuemethod）导出两侧的Korteweg-de Vries（KdV）方程。通过孤立的ansatz技术获得KdV方程的解。考虑到实验获得的等离子体参数，研究了非拓扑和拓扑孤子的产生以及碰撞效应。研究表明，与其他离子物种等离子体相比，非拓扑孤子的非线性对于\（K ^ {+}-C_ {7} F_ {14} ^ {-} \等离子体而言更加明显。负离子物种的质量和密度在拓扑孤子的潜在分布中起着至关重要的作用。取决于等离子体参数，由于碰撞而在碰撞区域中产生了新型的大振幅波。

图形摘要