Modulation instability and soliton formation in the interaction of X-ray laser beam with relativistic quantum plasma

2019 ◽  
Vol 26 (6) ◽  
pp. 062112 ◽  
Author(s):  
R. Roozehdar Mogaddam ◽  
N. Sepehri Javan ◽  
K. Javidan ◽  
H. Mohammadzadeh
Keyword(s):  
Laser Beam ◽  
Modulation Instability ◽  
Relativistic Quantum ◽  
Quantum Plasma ◽  
X Ray

scholarly journals Relativistic Quantum Response of a Strongly Magnetised Plasma. I. Mildly Relativistic Electron Gas

1992 ◽  
Vol 45 (2) ◽  
pp. 131 ◽  
Author(s):  
WEP Padden
Keyword(s):  
Relativistic Electron ◽  
Cyclotron Frequency ◽  
Relativistic Quantum ◽  
Quantum Plasma ◽  
Plasma Dynamics ◽  
X Ray ◽  
Analytic Expressions ◽  
Graphical Technique ◽  
Plasma Dispersion ◽  
Wave Properties

Approximate analytic expressions are derived for the linear response 4-tensor of a strongly magnestised, mildly relativistic electron plasma. The results are obtained within the framework of quantum plasma dynamics, thus the response contains relativistic and quantum effects that are essential in a super-strong magnetic field. The response is obtained in terms of relativistic plasma dispersion functions known as Shkarofsky functions. These functions allow the wave properties of the plasma to be studied without resorting to complicated numerical schemes. The response derived is valid for radiation with frequency up to about the cyclotron frequency and is of use in the theory of spectra formation in X-ray pulsars. In addition, a simple graphical technique is introduced that allows one to visually locate the roots of the resonant denominator occurring in the response, as well as determine the conditions under which both roots are valid and contribute to absorption.

scholarly journals Perturbative approach to the self-focusing of intense X-ray laser beam propagating in thermal quantum plasma

2018 ◽  
Vol 25 (11) ◽  
pp. 112104 ◽  
Author(s):  
R. Roozehdar Mogaddam ◽  
N. Sepehri Javan ◽  
K. Javidan ◽  
H. Mohammadzadeh
Keyword(s):  
Laser Beam ◽  
The Self ◽  
Quantum Plasma ◽  
Perturbative Approach ◽  
X Ray ◽  
Self Focusing

Soft X-ray emission from an anharmonic collisional nanoplasma by a laser–nanocluster interaction

2021 ◽  
Vol 87 (3) ◽  
Author(s):  
R. Nemati Siahmazgi ◽  
S. Jafari
Keyword(s):  
Electric Field ◽  
Laser Beam ◽  
Resonant Frequency ◽  
Restoring Force ◽  
Cluster Radius ◽  
X Ray ◽  
Nonlinear Restoring Force ◽  
Cluster Temperature ◽  
Argon Clusters ◽  
Helium Neon

The purpose of the present paper is to investigate the generation of soft X-ray emission from an anharmonic collisional nanoplasma by a laser–nanocluster interaction. The electric field of the laser beam interacts with the nanocluster and leads to ionization of the cluster atoms, which then produces a nanoplasma. Because of the nonlinear restoring force in an anharmonic nanoplasma, the fluctuations and heating rate of, as well as the power radiated by, the electrons in the nanocluster plasma will be notably different from those arising from a linear restoring force. By comparing the nonlinear restoring force state (which arises from an anharmonic cluster) with that of the linear restoring force (in harmonic clusters), the cluster temperature specifically changes at the resonant frequency relative to the linear restoring force, while the variation of the anharmonic cluster radius is almost identical to that of the harmonic cluster radius. In addition, it is revealed that a sharp peak of X-ray emission arises after some picoseconds in deuterium, helium, neon and argon clusters.

scholarly journals Relativistic ponderomotive self-focusing of quadruple Gaussian laser beam in cold quantum plasma

2018 ◽  
Vol 36 (3) ◽  
pp. 353-358 ◽  
Author(s):  
Richa ◽  
Munish Aggarwal ◽  
Harish Kumar ◽  
Ranju Mahajan ◽  
Navdeep Singh Arora ◽  
...  
Keyword(s):  
Refractive Index ◽  
Laser Beam ◽  
Electron Temperature ◽  
Density Perturbation ◽  
Beam Width ◽  
Quantum Plasma ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Linear Differential ◽  
Paraxial Ray

AbstractIn the present paper, we have investigated self-focusing of the quadruple Gaussian laser beam in underdense cold quantum plasma. The non-linearity chosen is associated with the relativistic mass effect that arises due to quiver motion of electron and electron density perturbation caused by ponderomotive force. The non-linearity modifies the plasma frequency in the dielectric function and hence the refractive index of the medium. The focusing/defocusing of the quadruple laser depends on the refractive index of the medium. We have set up non-linear differential equation that controls the beam width parameter by using well-known paraxial ray approximation and Wentzel–Krammers–Brillouin approximation. The effect of intensity parameter and electron temperature is observed on laser beam self-focusing in the presence of cold quantum plasma. From the results, it is revealed that electron temperature and the initial intensity of the laser beam control the profile dynamics of the laser beam.

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