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Twisted modes instability of electron–positron shell interacted with moving ion background

Published online by Cambridge University Press:  18 August 2017

D. Nobahar ,
K. Hajisharifi  and
H. Mehdian
D. Nobahar
Affiliation:
Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofatteh Avenue, Tehran 15614, Iran
K. Hajisharifi*
Affiliation:
Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofatteh Avenue, Tehran 15614, Iran
H. Mehdian
Affiliation:
Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofatteh Avenue, Tehran 15614, Iran
*
*Address correspondence and reprint requests to: K. Hajisharifi, Department of Physics and Institute for Plasma Research, Kharazmi University, 49 Dr. Mofatteh Avenue, Tehran 15614, Iran. E-mail: [email protected]
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Abstract

In this paper, the instability of electrostatic twisted modes carrying orbital angular momentum in the moving electron–positron–ion plasma is investigated. In the kinetic theory approach, the general dispersion relation of twisted modes is derived by using Laguerre–Gaussian perturbed distribution function and electrostatic potential in the paraxial limit. Utilizing the obtained general dispersion relation for a specific case of electron–positron (e–p) shell with temperature anisotropy interacted with moving ion background, the effects of angular mode number, electrons and positrons temperature, and positron concentration on the group velocity and instability growth rate of twisted waves are illustrated, numerically. The results of the present investigation will greatly attribute to the understanding of e–p jet dynamic in astrophysical environments and laboratory experiments where the twisted modes can play a central role as a perturbed term.

Keywords

Electron–positron shellLaguerre–Gaussian functionsTwisted plasma waves
Type
Research Article
Information
Laser and Particle Beams , Volume 35 , Issue 3 , September 2017 , pp. 543 - 550
Copyright
Copyright © Cambridge University Press 2017 

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