Ion acoustic double layers in a multicomponent plasma consisting of positive ions, negative ions, and nonthermal electrons filled in a cylindrical waveguide have been theoretically investigated using pseudopotential technique. The expression of Sagdeev potential for the ion acoustic wave in such a plasma has been derived, and the conditions for the existence of double layers are obtained. The effects of the boundary of cylindrical waveguide and nonthermal electrons on the Sagdeev potential have been graphically discussed. From the nonlinear equation, the solution for double layers of small amplitude ion acoustic waves is obtained, and the structure of double layers is analyzed as function of the plasma parameters. It is seen that finite geometry of bounded plasma, nonthermality of electrons, density of negative ions, and stream velocity of positive and negative ions have significant contribution on the structure of double layers. The double layers may be compressive or rarefactive in plasma depending upon the values of the plasma parameters.

中文翻译：

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圆柱波导边界和非热电子对多组分有界等离子体中离子声双电层的影响

已经使用赝势技术从理论上研究了由填充在圆柱形波导中的正离子、负离子和非热电子组成的多组分等离子体中的离子声双层。导出了这种等离子体中离子声波的萨格杰夫势的表达式，得到了双电层存在的条件。圆柱波导和非热电子的边界对 Sagdeev 势的影响已经进行了图形化讨论。从非线性方程得到小振幅离子声波双层的解，并分析双层结构作为等离子体参数的函数。可以看出，有界等离子体的有限几何形状、电子的非热性、负离子的密度、正负离子的流速和流速对双层结构有显着贡献。取决于等离子体参数的值，双层在等离子体中可以是压缩的或稀薄的。