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Time-Dependent Cylindrical and Spherical Solitary Structures and Double Layers of dust ion-acoustic waves in Ultra-Relativistic Dense Plasma

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Communications in Theoretical Physics 2013年第6期59卷 745-750页

作者： T.Akhter M.M.Hossain A.A.Mamun Department of Physics Jahangirnagar University

Cylindrical and spherical (nonplanar) solitary waves (SWs) and double layers (DLs) in a multi-ion plasma system (containing inertial positively as well as negatively charged ions, non-inertial degenerate electrons, and negatively charged static dust) are studied by employing the standard reductive perturbation method. The modified Gardner (MG) equation describing the nonlinear propagation of the dust ion-acoustic (DIA) waves is derived, and its nonplanar SWs and DLs solutions are numerically analyzed. The parametric regimes for the existence of SWs, which are associated with both positive and negative potential, and DLs which are associated with negative potential, are obtained. The basic features of nonplanar DIA SWs, and DLs, which are found to be different from planar ones, are also identified.

关键词： solitary waves double layers ultra-relativistic dense plasma dust ion acoustic waves Gardnerequation

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Nonlinear Structures in an ion-Beam Plasmas Including dust Impurities with Nonthermal Nonextensive Electrons

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Communications in Theoretical Physics 2017年第7期67卷 117-124页

作者： Debjit Dutta Biswajit Sahu Department of Mathematics West Bengal State University Barasat Kolkata 700126 India

The properties of dust ion acoustic waves are investigated in an unmagnetized multicomponent plasma system consisting of ion beam, charged positive and negative ions, electrons obeying nonthermal-Tsallis distribution and stationary negatively charged dust grains by the conventional Sagdeev pseudopotential method, through which the condition for existence of several nonlinear structures is analyzed theoretically. The dispersion relation for electrostatic waves is derived and analyzed and an expression of the energy integral equation is obtaJned. It is reported here that our plasma model supports solitions, double layers and supersoliton solutions for certain range of parameters. Finally, the effects of different physical plasma parameters on these nonlinear structures are studied numerically. The present theory should be helpful in understanding the salient features of the electrostatic waves in space and in laboratory plasmas where two distinct groups of ions and non-Maxwellian distributed electrons are present.

关键词： multicomponent plasma dust ion acoustic waves solitons and supersolitons

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