scholarly journals Conversion efficiency of even harmonics of whistler pulse in quantum magnetoplasma

2019 ◽  
Vol 37 (01) ◽  
pp. 5-11
Author(s):  
Punit Kumar ◽  
Shiv Singh ◽  
Nafees Ahmad
Keyword(s):  
Magnetic Field ◽  
Conversion Efficiency ◽  
Plasma Electron ◽  
Quantum Plasma ◽  
Fundamental Wave ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Classical Plasma ◽  
Quantum Hydrodynamic ◽  
Statistical Pressure

AbstractStudy of even harmonic generation resulting from propagation of whistler pulse in homogeneous high-density quantum plasma immersed in an externally applied magnetic field, using the recently developed quantum hydrodynamic model is presented. The effects of quantum Bohm potential, quantum statistical pressure, and electron spin have been taken into account. The field amplitude of even harmonic of the whistler with respect to fundamental wave and the conversion efficiency for phase-mismatch has been analyzed. The conversion efficiency of harmonic radiation depends on the plasma electron density, magnetic field strength as well as the intensity of whistler pulse. The efficiency increases significantly with an increase in plasma density, magnetic field and whistler wave intensity. Higher conversion efficiency is observed in degenerate plasma for lower values of the static magnetic field as compared with classical plasma.

scholarly journals Propagation of TE-Surface Waves on Semi-Bounded Quantum Plasma

2010 ◽  
Vol 2010 ◽  
pp. 1-4 ◽  
Author(s):  
B. F. Mohamed ◽  
M. Abdel Aziz
Keyword(s):  
Magnetic Field ◽  
Surface Waves ◽  
Electric Fields ◽  
Quantum Plasma ◽  
Surface Modes ◽  
Bohm Potential ◽  
Quantum Electron ◽  
Qhd Model ◽  
Quantum Hydrodynamic ◽  
Unmagnetized Plasma

The propagation of the TE-surface waves on a semibounded quantum plasma is investigated by using the system of generalized quantum hydrodynamic (QHD) model and Maxwell's equations. The dispersion relations for these surface waves on quantum electron plasma in the presence of external magnetic field which is parallel to the wave propagation are derived. The perturbation of electron density and the electric fields of the TE-surface waves are also obtained. However, it was found that quantum effects (Bohm potential and statistical) have no remarkable action on the electric and magnetic field components in the case of unmagnetized plasma. But, it was found that the dispersion relation of surface modes depends significantly on these effects in the case of electrostatic or unmagnetized plasma.

Laser beam guiding in partially stripped magnetized quantum plasma

Laser Physics ◽  
2021 ◽  
Vol 32 (1) ◽  
pp. 016002
Author(s):  
Punit Kumar ◽  
Nisha Singh Rathore
Keyword(s):  
Laser Beam ◽  
Spot Size ◽  
Quantum Plasma ◽  
Beam Power ◽  
Linear Wave ◽  
Linear Wave Equation ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Expansion Technique ◽  
Linearly Polarized

Abstract Relativistic and ponderomotive nonlinearities arising by the passage of a linearly polarized laser beam through a partially stripped magnetized quantum plasma are analyzed. The interaction formalism has been developed using the recently developed quantum hydrodynamic model. The effects associated with the Fermi pressure, quantum Bohm potential and electron spin have been incorporated. A nonparaxial, non-linear wave equation has been obtained by the use of source dependent expansion technique and spot size has been evaluated. The nonlinear relativistic self-focusing tends to focus the beam while the ponderomotive nonlinearity tends to defocus. The effect of magnetization and quantum effects on the spot size and the beam power have been studied.

scholarly journals Linear and nonlinear low-frequency collisional quantum Buneman Instability in electron-positron-ion Plasmas

2021 ◽  
Vol 49 (1) ◽  
Author(s):  
M. Nasir Khattak ◽  
◽  
U. Zakir ◽  
M. Yaqoob Khan ◽  
Niaz. Wali ◽  
...  
Keyword(s):  
Low Frequency ◽  
Coulomb Systems ◽  
Nonlinear Problems ◽  
Momentum Equation ◽  
Quantum Plasma ◽  
Potential Term ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Linear And Nonlinear ◽  
Quantum Limits

The linear and nonlinear low-frequency collisional quantum Buneman instability in electronpositron- ion plasmas have been studied. Buneman instability in low frequency three species quantum plasma has been investigated using the approach of the quantum hydrodynamic model. The one-dimensional low-frequency collisional model is revisited by introducing the Bohm potential term in the momentum equation along with the role of the positron. Low-frequency Buneman instability which arises by one stream of particles drifting over another is investigated in the presence of the positron. Different plasma configurations based on the relative velocities of streaming particles are analyzed and it is observed that positron content enhances the instability in classical limits. Further, we found that in pure quantum limits the instability growth rate is decreased by increasing the positron concentration. The present work is very useful for the nonlinear problems in Quantum Coulomb systems.

Landau Quantised Modification of Rayleigh–Taylor Instability in Dense Plasmas

2020 ◽  
Vol 75 (2) ◽  
pp. 113-118 ◽  
Author(s):  
M. Shahid ◽  
A. Rasheed ◽  
Misbah Kanwal ◽  
M. Jamil
Keyword(s):  
Magnetic Field ◽  
Gravitational Instability ◽  
Taylor Instability ◽  
Dense Plasmas ◽  
Exchange Correlation ◽  
Quantum Hydrodynamic Model ◽  
Exchange Correlation Potential ◽  
Correlation Potential ◽  
Rayleigh Taylor Instability ◽  
Quantum Hydrodynamic

AbstractEffects of Landau quantisation and exchange-correlation potential on Rayleigh–Taylor instability (RTI)/gravitational instability are investigated in inhomogeneous dense plasmas. Quantum hydrodynamic model is used for the electrons, while the ions are assumed to be cold and classical. RTI is modified with the inclusion of Landau quantisation related to plasma density, ambient magnetic field, exchange speed, and modified Fermi speed. Owing to the exchange-correlation effects, gravitational instability increases, whereas the Landau quantisation effects contribute in the opposite way for quantisation factor η < 1. Since the exchange-correlation potential is a function of density, by controlling the number density and magnetic field one can control RTI.

scholarly journals Photon equivalent charge in a two-electron temperature Fermi plasma

2009 ◽  
Vol 75 (1) ◽  
pp. 3-7 ◽  
Author(s):  
L. A. RIOS ◽  
P. K. SHUKLA ◽  
A. SERBETO
Keyword(s):  
Electron Temperature ◽  
Density Fluctuations ◽  
Hot Electrons ◽  
Quantum Hydrodynamic Model ◽  
Radiation Fields ◽  
Cold Electrons ◽  
Quantum Hydrodynamic ◽  
Quantum Force ◽  
Statistical Pressure ◽  
Equivalent Photon

AbstractThe equivalent photon charge in a two-electron temperature Fermi plasma is determined through the plasma physics method. The Fermi plasma has distinct populations of hot and cold electrons that are described by a quantum hydrodynamic model which accounts for the quantum statistical pressure of the hot electrons and the quantum force acting on the two electron fluids. Relations for the coupling between the electron plasma density fluctuations and the radiation fields are derived, and the effective photon charge is then calculated.

scholarly journals Effects of plasma electron temperature and magnetic field on the propagation dynamics of Gaussian laser beam in weakly relativistic cold quantum plasma

2019 ◽  
Vol 37 (4) ◽  
pp. 435-441 ◽  
Author(s):  
Munish Aggarwal ◽  
Vimmy Goyal ◽  
Richa Kashyap ◽  
Harish Kumar ◽  
Tarsem Singh Gill
Keyword(s):  
Magnetic Field ◽  
Laser Beam ◽  
Electron Temperature ◽  
Axial Magnetic Field ◽  
Beam Width ◽  
Plasma Electron ◽  
Quantum Plasma ◽  
Gaussian Laser Beam ◽  
Self Focusing ◽  
Initial Plasma

AbstractSelf-focusing of Gaussian laser beam has been investigated in quantum plasma under the effect of applied axial magnetic field. The nonlinear differential equation has been derived for studying the variations in the beam-width parameter. The effect of initial plasma electron temperature and the axial magnetic field on self-focusing and normalized intensity are studied. Our investigation reveals that normalized intensity increases to tenfolds where quantum effects are dominant. The normalized intensity further increases to twelvefolds on increasing the magnetic field.

Influence of varying magnetic field on nonlinear wave excitations in collisional quantum plasmas

2020 ◽  
Vol 75 (11) ◽  
pp. 913-919
Author(s):  
Debasish Roy ◽  
Biswajit Sahu
Keyword(s):  
Magnetic Field ◽  
Nonlinear Wave ◽  
Numerical Solutions ◽  
Soliton Solutions ◽  
Quantum Plasma ◽  
Type Model ◽  
Weakly Nonlinear ◽  
Quantum Hydrodynamic Model ◽  
Frame Work ◽  
Spatially Varying

AbstractThe nonlinear wave excitations arising from the spatially varying magnetic field in the quantum plasma environment are investigated in the frame work of quantum hydrodynamic model. In the weakly nonlinear, dispersive and dissipative limit it is shown that the varying magnetic field and collision-induced excitations can be described by a modified form of Korteweg-de Vries–Burgers’ type model equation. It is found that the dissipation terms (Burgers’ and collisional term) arise due to spatially varying magnetic field and the ion-neutral collisions. The numerical solutions of this equation predict that the localized soliton solutions decay algebraically due to the combined effect of varying magnetic field and collision by radiating oscillatory pulses behind the propagating soliton.

Resonant interactions between the fundamental and higher harmonic of positron acoustic waves in quantum plasma

2020 ◽  
Vol 75 (10) ◽  
pp. 819-824
Author(s):  
Jit Sarkar ◽  
Swarniv Chandra ◽  
Basudev Ghosh
Keyword(s):  
Conversion Efficiency ◽  
Acoustic Waves ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Quantum Plasma ◽  
Fundamental Wave ◽  
Phase Velocities ◽  
Resonant Interactions ◽  
Ion Plasma ◽  
Gradual Evolution

AbstractIn this paper, we study the second harmonic generation and its interaction with the fundamental mode in a magnetised dense positron-ion plasma interacting with laser pulses. It has been shown that different harmonics propagate with different phase velocities. The gradual evolution of the fundamental wave into higher harmonics is studied, and the conversion efficiency is calculated. Dependence of conversion efficiency on wavenumber shifts and the applied magnetic field has also been examined.

scholarly journals Drift Modified Longitudinal Electrokinetic Mode in Colloids Laden Semiconductor Quantum Plasmas

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Sandhya Chaudhary ◽  
Nilesh Nimje ◽  
Nishchhal Yadav ◽  
S. Ghosh
Keyword(s):  
Quantum Effect ◽  
Wave Spectrum ◽  
Linear Dispersion ◽  
Semiconductor Plasma ◽  
Quantum Hydrodynamic Model ◽  
Bohm Potential ◽  
Dc Electric Field ◽  
Quantum Hydrodynamic ◽  
Quantum Semiconductor ◽  
Absorption Characteristics

Dispersion and absorption characteristics of electrokinetic wave in unmagnetised extrinsic semiconductor with streaming carriers are analytically investigated. By using quantum hydrodynamic model, a linear dispersion relation is derived for longitudinal electrokinetic wave in colloids laden semiconductor plasma under slow electrokinetic mode regime. Results indicate that quantum effect through Bohm potential significantly modifies the dispersion and absorption characteristics of electrokinetic wave spectrum. The outcome is hoped to add substantially to the present knowledge of wave spectrum of longitudinal electrokinetic wave in colloids laden quantum semiconductor plasma subjected to a dc electric field along the direction of wave propagation.

scholarly journals Electron acceleration by whistler pulse in high-density plasma

2017 ◽  
Vol 35 (3) ◽  
pp. 386-390
Author(s):  
A.K. Singh
Keyword(s):  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Plasma Frequency ◽  
Threshold Value ◽  
High Density ◽  
Quantum Plasma ◽  
Quantum Hydrodynamic Model ◽  
Threshold Amplitude ◽  
Dirac Distribution ◽  
Quantum Hydrodynamic

AbstractThe acceleration of an electron by the ponderomotive force of a Gaussian whistler pulse in a magnetized high-density quantum plasma obeying Fermi–Dirac distribution is studied using the recently developed quantum hydrodynamic model. Effective acceleration takes place when the peak whistler amplitude exceeds a threshold value, and the whistler frequency is greater than the cyclotron frequency. The threshold amplitude decreases with ratio of plasma frequency to electron cyclotron frequency. The electron is accelerated at velocities of about twice the group velocity of the whistler.

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