scholarly journals Electron acceleration by ponderomotive force in magnetized quantum plasma

2017 ◽  
Vol 35 (2) ◽  
pp. 252-258 ◽  
Author(s):  
A.K. Singh ◽  
S. Chandra
Keyword(s):  
Laser Pulse ◽  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Electron Acceleration ◽  
Basic Mechanism ◽  
Laser Frequency ◽  
Quantum Plasma ◽  
Circularly Polarized ◽  
Ponderomotive Potential ◽  
Density Plasma

AbstractThe possibilities of electron acceleration by ponderomotive force of a circularly polarized laser pulse in magnetized quantum plasma have been explored. The basic mechanism involves acceleration of electron by the axial gradient in the ponderomotive potential of the laser. The quantum effects have been taken into account for a high-density plasma. The ponderomotive force of the laser is resonantly enhanced when Doppler up-shifted laser frequency equals the cyclotron frequency.

scholarly journals The ponderomotive force of an electromagnetic wave in a collisional plasma

1984 ◽  
Vol 32 (3) ◽  
pp. 487-493 ◽  
Author(s):  
M. L. Sawley
Keyword(s):  
Electromagnetic Wave ◽  
Spatial Variation ◽  
Wave Field ◽  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Particle Density ◽  
Magnetized Plasma ◽  
Nonlinear Propagation ◽  
Circularly Polarized ◽  
Ponderomotive Potential

The nonlinear propagation of a circularly polarized, electromagnetic wave in a collisional, infinite, magnetized plasma is considered. The presence of collisions leads to spatial variation in the amplitude of the wave field which gives rise to a time-independent ponderomotive force. The ponderomotive potential for a left (right) circularly polarized wave attains a maximum at the ion (electron) cyclotron frequency. In the vicinity of the cyclotron frequency it is shown to be always positive. A decrease in both the particle density and the real and imaginary parts of the complex wavenumber is shown to result from the effect of the ponderomotive force.

scholarly journals Relativistic and ponderomotive self-focusing of a laser pulse in magnetized plasma

2012 ◽  
Vol 30 (4) ◽  
pp. 659-664 ◽  
Author(s):  
Anamika Sharma ◽  
V.K. Tripathi
Keyword(s):  
Laser Pulse ◽  
Cyclotron Frequency ◽  
Ponderomotive Force ◽  
Beam Width ◽  
Laser Frequency ◽  
Electron Cyclotron ◽  
The Self ◽  
Magnetized Plasma ◽  
Electron Cyclotron Frequency ◽  
Self Focusing

AbstractThe self-focusing of an intense right circularly polarized Gaussian laser pulse in magnetized plasma is studied. The ions are taken to be immobile and relativistic mass effect is incorporated in both the plasma frequency (ωp) and the electron cyclotron frequency (ωc) while determining the ponderomotive force on electrons. The ponderomotive force causes electron expulsion when the effective electron cyclotron frequency is below twice the laser frequency. The nonlinear plasma dielectric function due to ponderomotive and relativistic effects is derived, which is then employed in beam-width parameter equation to study the self-focusing of the laser beam. From this, we estimate the importance of relativistic self-focusing in comparison with ponderomotive self-focusing at moderate laser intensities. The beam width parameter decreases with magnetic field indicating better self-focusing. When the laser intensity is very high, the relativistic gamma factor can be modeled as ${\rm \gamma} = 0.8\left({{{{\rm \omega} _c } / {\rm \omega} }} \right)+ \sqrt {1 + a_0^2 }$γ=0.8(ωc/ω)+1+a02 where ω and a0 are the laser frequency and the normalized laser field strength, respectively. The cyclotron effects on the self-focusing of laser pulse are reduced at high field strengths.

scholarly journals Electric, magnetic Wakefields, and electron acceleration in quantum plasma

2012 ◽  
Vol 30 (2) ◽  
pp. 267-273 ◽  
Author(s):  
P. Kumar ◽  
C. Tewari
Keyword(s):  
Laser Pulse ◽  
Laser Beam ◽  
Quantum Effects ◽  
Electron Acceleration ◽  
Quantum Plasma ◽  
Incident Laser Beam ◽  
Incident Laser ◽  
High Energies ◽  
Test Electron ◽  
Radial Forces

AbstractA detailed study of Wakefield excitation in very dense quantum plasma is presented. Electric and magnetic Wakefields have been obtained for a particular profile of the laser pulse, using perturbative technique involving orders of the incident laser beam. The Wakefields can trap electrons and accelerate them to extremely high energies. It is observed that the quantum effects significantly change the classical nature of the Wakefield. The axial and radial forces acting on a test electron due to the Wakefields have been evaluated.

scholarly journals The effects of circularly polarized laser pulse on generated electron nano-bunches in oscillating mirror model

2014 ◽  
Vol 32 (2) ◽  
pp. 285-293 ◽  
Author(s):  
M. Shirozhan ◽  
M. Moshkelgosha ◽  
R. Sadighi-Bonabi
Keyword(s):  
Laser Pulse ◽  
Laser Plasma ◽  
Dense Plasma ◽  
Ponderomotive Force ◽  
Laser Pulses ◽  
Incident Laser ◽  
Circularly Polarized ◽  
Plasma Surface ◽  
Laser Plasma Interaction ◽  
Incident Laser Pulse

AbstractThe effects of the polarized incident laser pulse on the electrons of the plasma surface and on the reflected pulse in the relativistic laser-plasma interaction is investigated. Based on the relativistic oscillating mirror and totally reflecting oscillating mirror (TROM) regimes, the interaction of the intense polarized laser pulses with over-dense plasma is considered. Based on the effect of ponderomotive force on the characteristic of generated electron nano-bunches, considerable increasing in the localization and charges of nano-bunches are realized. It is found that the circularly polarized laser pulse have Ne/Ncr of 1500 which is almost two and seven times more than the amounts for P-polarized and S-polarized, respectively.

scholarly journals Generation of magnetic fields by the ponderomotive force of electromagnetic waves in dense plasmas

2009 ◽  
Vol 76 (1) ◽  
pp. 25-28 ◽  
Author(s):  
P. K. SHUKLA ◽  
NITIN SHUKLA ◽  
L. STENFLO
Keyword(s):  
Electromagnetic Wave ◽  
Magnetic Fields ◽  
Electromagnetic Waves ◽  
Ponderomotive Force ◽  
Intense Laser ◽  
Quantum Plasma ◽  
Dense Plasmas ◽  
Solid Density ◽  
Astrophysical Objects ◽  
Density Plasma

AbstractWe show that the non-stationary ponderomotive force of a large-amplitude electromagnetic wave in a very dense quantum plasma with streaming degenerate electrons can spontaneously create d.c. magnetic fields. The present result can account for the seed magnetic fields in compact astrophysical objects and in the next-generation intense laser–solid density plasma interaction experiments.

Electron acceleration by a circularly polarized electromagnetic wave publishing in plasma with a periodic magnetic field and an axial guide magnetic field

2018 ◽  
Vol 32 (20) ◽  
pp. 1850225 ◽  
Author(s):  
Mehdi Abedi-Varaki
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Wave ◽  
Laser Pulse ◽  
Electron Energy ◽  
Electron Acceleration ◽  
Electron Trajectory ◽  
Field Frequency ◽  
Circularly Polarized ◽  
Runge Kutta Method ◽  
Guide Magnetic Field

In this paper, we study the electron acceleration by a circularly polarized electromagnetic wave propagating through plasma in the presence of a periodic and an axial guide magnetic field. A numerical calculation in MATLAB software was developed by employing the fourth-order Runge–Kutta method for studying the electron energy and electron trajectory in plasma medium. The equations governing the electron momentum and energy which describe electron acceleration by a circularly polarized laser pulse have been obtained. It is shown that by choosing an appropriate wiggler field frequency at short distances, the electron retains an adequate amount of energy. In addition, it is found that due to the simultaneous existence of the wiggler field and field of laser pulse and their combined effects, the electron in the direction of the laser pulse propagating, turns around and subsequently, the electron transverse momentum increases and as a result the electron escapes from the laser pulse near the laser pulse peak. Furthermore, it is seen that by increasing the laser intensity, the electron energy decreases and by decreasing to an appropriate value while employing a wiggler magnetic field, a higher peak of energy is gained.

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