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Title: The impact of positrons beam on the propagation of super freak waves in electron-positron-ion plasmas

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.

Authors:
 [1];  [2];  [3];  [4]
  1. Theoretical Plasma Physics Division, PINSTECH, Nilore 44000 Islamabad (Pakistan)
  2. (NCP), Shahdra Valley Road, 44000 Islamabad (Pakistan)
  3. (PIEAS), Islamabad (Pakistan)
  4. Department of Physics, Faculty of Science, Port Said University, Port Said 42521 (Egypt)
Publication Date:
OSTI Identifier:
22600043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 7; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CATIONS; DISTURBANCES; ELECTRONS; INSTABILITY; ION ACOUSTIC WAVES; NONLINEAR PROBLEMS; PERTURBATION THEORY; PLASMA; POSITRON BEAMS; POSITRONS; SCHROEDINGER EQUATION; VELOCITY

Citation Formats

Ali Shan, S., National Centre for Physics, Pakistan Institute of Engineering and Applied Sciences, and El-Tantawy, S. A., E-mail: samireltantawy@yahoo.com. The impact of positrons beam on the propagation of super freak waves in electron-positron-ion plasmas. United States: N. p., 2016. Web. doi:10.1063/1.4958315.
Ali Shan, S., National Centre for Physics, Pakistan Institute of Engineering and Applied Sciences, & El-Tantawy, S. A., E-mail: samireltantawy@yahoo.com. The impact of positrons beam on the propagation of super freak waves in electron-positron-ion plasmas. United States. doi:10.1063/1.4958315.
Ali Shan, S., National Centre for Physics, Pakistan Institute of Engineering and Applied Sciences, and El-Tantawy, S. A., E-mail: samireltantawy@yahoo.com. 2016. "The impact of positrons beam on the propagation of super freak waves in electron-positron-ion plasmas". United States. doi:10.1063/1.4958315.
@article{osti_22600043,
title = {The impact of positrons beam on the propagation of super freak waves in electron-positron-ion plasmas},
author = {Ali Shan, S. and National Centre for Physics and Pakistan Institute of Engineering and Applied Sciences and El-Tantawy, S. A., E-mail: samireltantawy@yahoo.com},
abstractNote = {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.},
doi = {10.1063/1.4958315},
journal = {Physics of Plasmas},
number = 7,
volume = 23,
place = {United States},
year = 2016,
month = 7
}
  • Electrostatic ion acoustic solitary waves are studied in a plasma system comprising of relativistic ions, kappa distributed electrons, and positrons. The increase in the relativistic streaming factor and positron and electron kappa parameters cause the soliton amplitude to thrive. However, the soliton amplitude diminishes as the positron concentration is increased in the system. Our results are general and may be helpful, in understanding nonlinear phenomena in the presence of kappa distibuted electrons, positrons, and relativistically streaming ions.
  • Positron-acoustic (PA) solitary waves (SWs) and double layers (DLs) in four-component plasmas consisting of immobile positive ions, mobile cold positrons, and superthermal (kappa distributed) hot positrons and electrons are investigated both numerically and analytically by deriving Korteweg–de Vries (K-dV), modified K-dV (mK-dV), and Gardner equations along with their DLs solutions using the reductive perturbation method. It is examined that depending on the plasma parameters, the K-dV SWs, Gardner SWs, and DLs support either compressive or rarefactive structures, whereas mK-dV SWs support only compressive structure. It is also found that the presence of superthermal (kappa distributed) hot positrons and hot electronsmore » significantly modify the basic features of PA SWs as well as PA DLs. Besides, the critical number density ratio of hot positrons and cold positrons play an important role in the polarity of PA SWs and DLs. The implications of our results in different space as well as laboratory plasma environments are briefly discussed.« less
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  • We have demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using a circularly polarized laser beam of 532 nm scattered off a high-quality, 1.28 GeV electron beam, we have obtained polarized positrons with an intensity of 2x10{sup 4} e{sup +}/bunch. The magnitude of positron polarization has been determined to be 73{+-}15(stat){+-}19(syst)% by means of a newly designed positron polarimeter.
  • The dynamic behavior of ion acoustic waves in electron-positron-ion magnetoplasmas with superthermal electrons and positrons has been investigated in the framework of perturbed and non-perturbed Kadomtsev-Petviashili (KP) equations. Applying the reductive perturbation technique, we have derived the KP equation in electron-positron-ion magnetoplasma with kappa distributed electrons and positrons. Bifurcations of ion acoustic traveling waves of the KP equation are presented. Using the bifurcation theory of planar dynamical systems, the existence of the solitary wave solutions and the periodic traveling wave solutions has been established. Two exact solutions of these waves have been derived depending on the system parameters. Then, usingmore » the Hirota's direct method, we have obtained two-soliton and three-soliton solutions of the KP equation. The effect of the spectral index κ on propagations of the two-soliton and the three-soliton has been shown. Considering an external periodic perturbation, we have presented the quasi periodic behavior of ion acoustic waves in electron-positron-ion magnetoplasmas.« less