Propagation of ion-acoustic solitons in an electron beam-superthermal plasma system with finite ion-temperature: Linear and fully nonlinear investigation

The propagation of ion-acoustic (IA) solitons is studied in a plasma system, comprised of warm ions and superthermal (Kappa distributed) electrons in the presence of an electron-beam by using a hydrodynamic model. In the linear analysis, it is seen that increasing the superthermality lowers the phas...

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Veröffentlicht in:Physics of plasmas 2013-03, Vol.20 (3)
Hauptverfasser: Saberian, E., Esfandyari-Kalejahi, A., Rastkar-Ebrahimzadeh, A., Afsari-Ghazi, M.
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container_title Physics of plasmas
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creator Saberian, E.
Esfandyari-Kalejahi, A.
Rastkar-Ebrahimzadeh, A.
Afsari-Ghazi, M.
description The propagation of ion-acoustic (IA) solitons is studied in a plasma system, comprised of warm ions and superthermal (Kappa distributed) electrons in the presence of an electron-beam by using a hydrodynamic model. In the linear analysis, it is seen that increasing the superthermality lowers the phase speed of the IA waves. On the other hand, in a fully nonlinear investigation, the Mach number range and characteristics of IA solitons are analyzed, parametrically and numerically. It is found that the accessible region for the existence of IA solitons reduces with increasing the superthermality. However, IA solitons with both negative and positive polarities can coexist in the system. Additionally, solitary waves with both subsonic and supersonic speeds are predicted in the plasma, depending on the value of ion-temperature and the superthermality of electrons in the system. It is examined that there are upper critical values for beam parameters (i.e., density and velocity) after which, IA solitary waves could not propagate in the plasma. Furthermore, a typical interaction between IA waves and the electron-beam in the plasma is confirmed.
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subjects 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM-PLASMA SYSTEMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRON BEAMS
ELECTRONS
HYDRODYNAMIC MODEL
HYDRODYNAMICS
ION ACOUSTIC WAVES
ION TEMPERATURE
MACH NUMBER
NONLINEAR PROBLEMS
NUMERICAL ANALYSIS
SOLITONS
SUBSONIC FLOW
SUPERSONIC FLOW
title Propagation of ion-acoustic solitons in an electron beam-superthermal plasma system with finite ion-temperature: Linear and fully nonlinear investigation
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