Fluid simulation of dispersive and nondispersive ion acoustic waves in the presence of superthermal electrons

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dc.contributor.author Lotekar, Ajay
dc.contributor.author Kakad, Amar
dc.contributor.author Kakad, Bharati
dc.date.accessioned 2017-11-07T12:00:35Z
dc.date.accessioned 2021-02-12T10:47:03Z
dc.date.available 2017-11-07T12:00:35Z
dc.date.available 2021-02-12T10:47:03Z
dc.date.issued 2016
dc.identifier.citation Physics of Plasmas, 23, 102108, doi: 10.1063/1.4964478 en_US
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1082
dc.description.abstract One-dimensional fluid simulation is performed for the unmagnetized plasma consisting of cold fluid ions and superthermal electrons. Such a plasma system supports the generation of ion acoustic (IA) waves. A standard Gaussian type perturbation is used in both electron and ion equilibrium densities to excite the IA waves. The evolutionary profiles of the IA waves are obtained by varying the superthermal index and the amplitude of the initial perturbation. This simulation demonstrates that the amplitude of the initial perturbation and the superthermal index play an important role in determining the time evolution and the characteristics of the generated IA waves. The initial density perturbation in the system creates charge separation that drives the finite electrostatic potential in the system. This electrostatic potential later evolves into the dispersive and nondispersive IA waves in the simulation system. The density perturbation with the amplitude smaller than 10% of the equilibrium plasma density evolves into the dispersive IA waves, whereas larger density perturbations evolve into both dispersive and nondispersive IA waves for lower and higher superthermal index. The dispersive IA waves are the IA oscillations that propagate with constant ion plasma frequency, whereas the nondispersive IA waves are the IA solitary pulses (termed as IA solitons in the stability region) that propagate with the constant wave speed. The characteristics of the stable nondispersive IA solitons are found to be consistent with the nonlinear fluid theory. To the best of our knowledge, this is the first fluid simulation study that has considered the superthermal distributions for the plasma species to model the electrostatic solitary waves. en_US
dc.language.iso en en_US
dc.subject Ion acoustic waves en_US
dc.subject Gaussian type perturbation en_US
dc.title Fluid simulation of dispersive and nondispersive ion acoustic waves in the presence of superthermal electrons en_US
dc.type Article en_US
dc.identifier.accession 091625


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