Electron acceleration by Bessel–Gaussian laser pulse in a plasma in the presence of an external magnetic field

Fallah, Reza; Khorashadizadeh, S. M.

doi:10.1016/j.hedp.2019.01.007

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…The profiles of the field distributions of the BG laser pulse are given as follows (Li, Lee & Wolf 2004): in which k and are the transverse wavenumber and the zero-order Bessel function, respectively. Using (2.37), (2.19) will be obtained under the conditions that the wake potential is zero at the middle of pulse as Employing the expansion of Bessel function, the coefficient of in (2.38) is achieved as follows (Fallah & Khorashadizadeh 2019): Here, is the confluent hyper-geometric function. Furthermore, the wakefield of the BG laser pulse is calculated as By inserting (2.40) in (2.23), the electron energy gain of the GL laser pulse in the presence of a wiggler field is obtained as follows: Equation (2.41) denotes the electron energy gain in the wakefield produced by a BG laser pulse in the presence of a planar magnetostatic wiggler in cold collisionless plasma.…”

Section: Fundamental Equations For Analysis Of Laser Wakefieldmentioning

confidence: 99%

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Impact of wiggler magnetic field on wakefield generation and electron acceleration by Gaussian, super-Gaussian and Bessel–Gaussian laser pulses propagating in collisionless plasma

Abedi‐Varaki

Daraei

2023

J. Plasma Phys.

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In this research, the process of electron acceleration and wakefield generation by Gaussian-like (GL), super-Gaussian (SG) and Bessel–Gaussian (BG) laser pulses through cold collisionless plasma in the presence of a planar magnetostatic wiggler are studied. Three different types of laser spatial profiles, GL, SG and BG, are considered. Additionally, using the hydrodynamics fluid equations, Maxwell's equations as well as the perturbation technique for GL, SG and BG laser pulses in the weakly nonlinear regime and in the presence of a planar magnetostatic wiggler, governing equations for analysing the laser wakefield and electron acceleration have been derived and compared correspondingly. In addition, the effect of some important factors, including the wiggler field strengths, laser intensity, pulse length, plasma electron density and laser frequency on the wakefield and the electron energy gain, have been investigated. Numerical results show that enhancing the wiggler magnetic field results in an increase in the amplitude of the wakefield. Furthermore, it is observed that in comparison with the wakefield amplitude excited by SG and GL laser pulses, the amplitude of the wakefield excited by BG laser pulse is larger when the wiggler field is enhanced. Moreover, it is realized that the type of the laser profile, selected laser parameters and wiggler magnetic field are the most decisive and effective factors in the wakefield amplitude and shape of wakefield generation through cold collisionless plasma. Also, it is seen that as the pulse length declines, the amplitude of the wakefield increases, and correspondingly the resonance positions shift to higher ${({\varOmega _w}/{\varOmega _p})_{max}}$ values.

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Section: Fundamental Equations For Analysis Of Laser Wakefieldmentioning

confidence: 99%

“…Employing the expansion of Bessel function, the coefficient of α BG in (2.38) is achieved as follows (Fallah & Khorashadizadeh 2019):…”

Section: Gl Laser Pulsementioning

confidence: 99%

Impact of wiggler magnetic field on wakefield generation and electron acceleration by Gaussian, super-Gaussian and Bessel–Gaussian laser pulses propagating in collisionless plasma

Abedi‐Varaki

Daraei

2023

J. Plasma Phys.

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“…The nonlinear interaction of intense laser pulse with plasma has attracted a lot of interest due to the number of important applications, such as the charged particles acceleration, [1][2][3][4][5][6][7][8] intense magnetic field generation, [9] shock generation, [10] X-ray lasers, [11,12] resonance absorption, [13] and optical harmonic generation. [14] In addition, some nonlinear effects appear such as Raman scattering, [15] ponderomotive and ohmic heating nonlinearities, [16][17][18] and inverse bremsstrahlung absorption (IBA) [19][20][21][22] during this interaction.…”

Section: Introductionmentioning

confidence: 99%

Influence of plasma inhomogeneity and ohmic heating on the nonlinear absorption of intense laser pulse in collisional magnetized plasma

Fallah,

Khooniki,

Khorashadizadeh

et al. 2023

Contributions to Plasma Physics

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The nonlinear absorption in the interaction of an intense laser pulse with a collisional magnetized plasma is studied by considering the effects of plasma inhomogeneity, ohmic heating, and ponderomotive force. For this purpose, we obtain the plasma electron density, the effective dielectric permittivity, and the wave equation using the Maxwell and hydrodynamic equations and solve this equation by the Runge–Kutta numerical method. The results are shown that by increasing the plasma inhomogeneity, the inverse bremsstrahlung absorption coefficient is increased, and also the density ramp parameter and its sign can affect more the absorption coefficient than the temperature ramp parameter . However, when the initial electron density and temperature increase, the laser field amplitude and the absorption coefficient are increased and the spatial damping rate of the laser pulse becomes highly peaked inside the plasma. It is shown by increasing laser pulse energy, the nonlinear bremsstrahlung absorption coefficient is decreased significantly. The results also indicate that by increasing the external magnetic field, the dielectric permittivity is decreased while the laser energy spatial damping, and the absorption coefficient are increased. Moreover, it is found that by considering the ohmic heating effect, the electrons absorb further energy from the fields and consequently the nonlinear absorption is increased.

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“…The interaction of high‐power laser pulse with a plasma has recently attracted a great deal of attention lead to the various applications, such as in the charged particles acceleration, [ 1–8 ] intense magnetic field generation, [ 9 ] x‐ray lasers, [ 10 ] resonance absorption, [ 11 ] frequency upshifting, [ 12 ] electron cavitation, [ 13 ] optical harmonic generation, [ 14 ] and nonlinear phenomena related to the ponderomotive force. [ 15 ] The ponderomotive force is a nonlinear force that charged particles experience by the spatial variation of laser intensity.…”

Section: Introductionmentioning

confidence: 99%

Effects of relativistic and ponderomotive nonlinearities on the interaction of high‐power laser beam with an inhomogeneous warm plasma

Fallah

Khooniki

Khorashadizadeh

et al. 2020

Contributions to Plasma Physics

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The influence of relativistic-ponderomotive nonlinearities and the plasma inhomogeneity on the nonlinear interaction between a high-power laser beam and a warm underdense plasma are studied. It is clear that the relativistic ponderomotive force and the electron temperature modify the electron density distribution and consequently change the dielectric permittivity of the plasma. Therefore, by presenting the modified electron density and the nonlinear dielectric permittivity of the warm plasma, the electromagnetic wave equation for the propagation of intense laser beam through the plasma is derived. This nonlinear equation is numerically solved and the distributions of electromagnetic fields in the plasma, the variations of electron density, and plasma refractive index are investigated for two different background electron density profiles. The results show that the amplitude of the electric field and electron density oscillations gradually increase and decrease, during propagation in the inhomogeneous warm plasma with linear and exponential density profiles, respectively, and the distribution of electron density becomes extremely sharp in the presence of intense laser beam. It is also indicated that the electron temperature and initial electron density have an impact on the propagation of the laser beam in the plasma and change the plasma refractive index and the oscillations' amplitude and frequency. The obtained results indicate the importance of a proper choice of laser and plasma parameters on the electromagnetic field distributions, density steepening, and plasma refractive index variations in the interaction of an intense laser beam with an inhomogeneous warm plasma.

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Electron acceleration by Bessel–Gaussian laser pulse in a plasma in the presence of an external magnetic field

Cited by 13 publications

References 28 publications

Impact of wiggler magnetic field on wakefield generation and electron acceleration by Gaussian, super-Gaussian and Bessel–Gaussian laser pulses propagating in collisionless plasma

Impact of wiggler magnetic field on wakefield generation and electron acceleration by Gaussian, super-Gaussian and Bessel–Gaussian laser pulses propagating in collisionless plasma

Influence of plasma inhomogeneity and ohmic heating on the nonlinear absorption of intense laser pulse in collisional magnetized plasma

Effects of relativistic and ponderomotive nonlinearities on the interaction of high‐power laser beam with an inhomogeneous warm plasma

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