scholarly journals Thermal behavior change in the self-focusing of an intense laser beam in magnetized electron-ion-positron plasma

2014 ◽  
Vol 32 (2) ◽  
pp. 321-330 ◽  
Author(s):  
N. Sepehri Javan ◽  
M. Hosseinpour Azad
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Laser Beam ◽  
Fluid Model ◽  
The Self ◽  
Intense Laser ◽  
Hot Electron ◽  
Circularly Polarized ◽  
Self Focusing ◽  
Electron Positron

AbstractSelf-focusing of an intense circularly-polarized laser beam in a hot electron-positron-ion magneto-plasma is studied. Using a relativistic fluid model, nonlinear equation describing laser-plasma interaction in the quasi-neutral approximation is derived. Expanding nonlinear current density in terms of normalized vector potential and saving only the parabolic terms, we investigated the self-focusing phenomenon for right- and left-hand circularly polarized laser beams. The evolution of laser beam spot size with Gaussian profile is considered. Effects of the external magnetic field, fraction of electron-positron pairs, and also the kind of polarization on the self-focusing property are studied. It is shown that a mixture of electron-positron pairs to the ion-electron plasma modifies the behavior of plasma with respect to the external magnetic field.

Effect of obliquely external magnetic field on the intense laser pulse propagating in plasma medium

2020 ◽  
Vol 34 (07) ◽  
pp. 2050044
Author(s):  
Mehdi Abedi-Varaki
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Laser Pulse ◽  
Magnetoactive Plasma ◽  
Spot Size ◽  
The Self ◽  
Intense Laser ◽  
Intense Laser Pulse ◽  
Laser Spot Size ◽  
Self Focusing

In this paper, self-focusing of intense laser pulse propagating along the obliquely external magnetic field on the collisional magnetoactive plasma by using the perturbation theory have been studied. The wave equation describing the interaction of intense laser pulse with collisional magnetoactive plasma is derived. In addition, employing source-dependent expansion (SDE) method, the analysis of the laser spot-size is discussed. It is shown that with increasing of the angle in obliquely external magnetic field, the spot-size of laser pulse decreases and as a result laser pulse becomes more focused. Furthermore, it is concluded that the self-focusing quality of the laser pulse has been enhanced due to the presence of obliquely external magnetic field in the collisional magnetoactive plasma. Besides, it is seen that with increasing of [Formula: see text], the laser spot-size reduces and subsequently the self-focusing of the laser pulse in plasma enhances. Moreover, it is found that changing the collision effect in the magnetoactive plasma leads to increases of self-focusing properties.

Effect of a strong magnetic field on the self-focusing of a laser beam in InSb

1977 ◽  
Vol 40 (1) ◽  
pp. 315-320
Author(s):  
M. S. Sodha ◽  
V. K. Tripathi ◽  
D. P. Singh
Keyword(s):  
Magnetic Field ◽  
Laser Beam ◽  
Strong Magnetic Field ◽  
The Self ◽  
Self Focusing

Focusing of an Intense Relativistic Electron Beam by a Hollow Conical Laser Beam

1975 ◽  
Vol 30 (8) ◽  
pp. 976-980
Author(s):  
F. Winterberg
Keyword(s):  
Laser Beam ◽  
Relativistic Electron ◽  
Radiation Pressure ◽  
Relativistic Electron Beam ◽  
Laser Light ◽  
Electron Beams ◽  
The Self ◽  
Intense Laser ◽  
Power Laser ◽  
Self Focusing

Abstract Estimates suggest that the nonlinear transverse radiation pressure produced within a plasma by a convergent annular high power laser beam may lead to the focusing of an intense relativistic electron down to a radius of ~10-4 cm. The transverse radiation pressure results from the dielectric property of a plasma in conjunction with the phenomena of the self-focusing of intense laser light. The tightly focused electron beams would make possible the release of thermonuclear energy by micro-explosions.

scholarly journals Dark and grey electromagnetic electron-cyclotron envelope solitons in an electron-positron magnetoplasma

2009 ◽  
Vol 75 (5) ◽  
pp. 575-580 ◽  
Author(s):  
P. K. SHUKLA ◽  
R. BINGHAM ◽  
A. D. R. PHELPS ◽  
L. STENFLO
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
External Magnetic Field ◽  
Wave Packet ◽  
Electron Cyclotron ◽  
Envelope Soliton ◽  
Circularly Polarized ◽  
Envelope Solitons ◽  
Electron Positron ◽  
Cubic Nonlinear Schrödinger Equation

AbstractWe present an investigation of the amplitude modulation of an external magnetic field-aligned right-hand circularly polarized electromagnetic electron-cyclotron (EMEC) wave in a strongly magnetized electron-positron plasma. It is shown that the dynamics of the modulated EMEC wave packet is governed by a cubic nonlinear Schrödinger equation. The latter reveals that a modulated wave packet can propagate in the form of either a dark or a grey envelope soliton. This result could have relevance to the transport of electromagnetic wave energy over long distances via envelope solitons in the magnetospheres of pulsars and magnetars.

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