|Author||Ali Shan, S. ♦ El-Tantawy, S. A.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ AMPLITUDES ♦ CATIONS ♦ DISTURBANCES ♦ ELECTRONS ♦ INSTABILITY ♦ ION ACOUSTIC WAVES ♦ NONLINEAR PROBLEMS ♦ PERTURBATION THEORY ♦ PLASMA ♦ POSITRON BEAMS ♦ POSITRONS ♦ SCHROEDINGER EQUATION ♦ VELOCITY|
|Abstract||In this work, we examine the nonlinear propagation of planar ion-acoustic freak waves in an unmagnetized plasma consisting of cold positive ions and superthermal electrons subjected to cold positrons beam. For this purpose, the reductive perturbation method is used to derive a nonlinear Schrödinger equation (NLSE) for the evolution of electrostatic potential wave. We determine the domain of the plasma parameters where the rogue waves exist. The effect of the positron beam on the modulational instability of the ion-acoustic rogue waves is discussed. It is found that the region of the modulational stability is enhanced with the increase of positron beam speed and positron population. Second as positrons beam increases the nonlinearities of the plasma system, large amplitude ion acoustic rogue waves are pointed out. The present results will be helpful in providing a good fit between the theoretical analysis and real applications in future laboratory plasma experiments.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Physics of Plasmas|
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