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Quadruple Gaussian Laser Beam Profile Dynamics in Collisionless Magnetized Plasma

Communications in Theoretical Physics 2018年第9期69卷 317-324页

作者： Shivani Vij munish aggarwal Department of Applied Sciences DAV Institute of Engineering&TechnologyJalandhar 144008India Department of Applied Sciences Lyallpur Khalsa College of EngineeringJalandhar 144001India

This paper presents an investigation of self-focusing of a quadruple Gaussian laser beam in collisionless magnetized *** nonlinearity due to ponderomotive force which arises on account of nonuniform intensity distribution of the laser beam is *** nonlinear partial differential equation governing the evaluation of complex envelope in the slowly varying envelope approximation is solved using a paraxial *** self-focusing mechanism in magnetized plasma,in the presence of self-compression mechanism will be analyzed in contrast to the case in which it is *** can be observed that,in case of ponderomotive nonlinearity,the self-compression mechanism obstructs the pulse self-focusing above a certain intensity *** effect of an external magnetic field is to generate pulses with smaller spot size and shorter compression *** lateral separation parameter and the initial intensity of the laser beam play a crucial role on focusing and compression ***,the three-dimensional analysis of pulse propagation is presented by coupling the self-focusing equation with the self-compression one.

关键词： self-focusing quadruple Gaussian beam magnetoplasma spatiotemporal ponderomotive force

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Study of obliquely propagating electron acoustic shock waves with non-extensive electron population

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Plasma Science and Technology 2019年第1期21卷 29-35页

作者： Sona BANSAL munish aggarwal Tarsem S GILL Sikh National College Research Scholar I K Gujral Punjab Technical University Department of Applied Science Lyallpur Khalsa College of Engineering Department of Physics Guru Nanak Dev University

Obliquely propagating electron acoustic shock waves in magnetized plasma composed of stationary ions, cold and non-extensive hot electrons are investigated by deriving Korteweg–de Vries Burgers(KdVB) equation. The tangent hyperbolic method is used to solve the KdVB equation in dissipative medium. The dissipation effect is introduced in the model by means of kinematic viscosity term. The analytical calculations of the KdVB equation shows that the structures(amplitude, velocity and width) of the shock waves are modified significantly with kinematic viscosity(η_0), obliqueness(k_z) and magnetic field(ω_c). Since plasmas are ubiquitously permeated with magnetic field, it is pertinent to explore the characteristics of KdVB equation in a magnetized plasmas.

关键词： dissipative medium non-extensive electrons tangent hyperbolic method

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Self-Focusing of Quadruple Gaussian Laser Beam in an Inhomogenous Magnetized Plasma with Ponderomotive Non-Linearity:Effect of Linear Absorption

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Communications in Theoretical Physics 2015年第11期64卷 565-570页

作者： munish aggarwal Shivani Vij Niti Kant Department of Physics Lyallpur Khalsa College of Engineering Department of Applied Sciences DAV Institute of Engineering & Technology Department of Physics Lovely Professional University

The propagation of quadruple Gaussian laser beam in a plasma characterized by axial inhomogeneity and nonlinearity due to ponderomotive force in the paraxial ray approximation is *** appropriate expression for the nonlinear dielectric constant has been developed in the presence of external magnetic field,with linear absorption and due to saturation effects for arbitrary large *** effects of different types of plasma axial inhomogeneities on self-focusing of laser beam have been studied with the typical laser and plasma ***-focusing of quadruple Gaussian laser beam in the presence of externally applied magnetic field and saturating parameter is found significantly improved in the case of extraordinary *** results reveal that initially converging beam shows oscillatory convergence whereas initially diverging beam shows oscillatory *** beam is more focussed at lower intensity in both cases *** and ordinary mode.

关键词： self-focusing quadruple inhomogeneous magnetized p

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