Nonlinear absorption of short intense laser pulse in multispecies plasma

Kargarian, A.; Hajisharifi, K.; Mehdian, H.

doi:10.1063/1.4961003

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…There are also many phenomena in plasma that are not yet well understood. To gain a better understanding of these phenomena, we need to know the plasma parameters of which density and temperature are the most important parameters to identify it [12,13].…”

Section: Intruductionmentioning

confidence: 99%

Plasma diagnostic in a compact IEC-based nuclear fusion device

Kargarian

Movahhed

2021

J. Inst.

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Section: Intruductionmentioning

confidence: 99%

Plasma diagnostic in a compact IEC-based nuclear fusion device

Kargarian

Movahhed

2021

J. Inst.

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“…With an intensity greater than 10 18 W cm −2 , the laser pulse creates a pressure of about 10 3 Mbar in underdense plasma and heats the plasma electrons [22]. Particle-in-cell (PIC) simulations depict rigorous laser absorption in finitesize multispecies plasmas and promise the enhancement in the Raman-Brillouin scattering process [23]. In an atmospheric medium, homonuclear molecules, such as O 2 and N 2 are abundant.…”

Section: Introductionmentioning

confidence: 99%

Electron Bernstein wave aided Hermite cosh-Gaussian laser beam absorption in collisional plasma

Varma¹,

Mishra²,

Kumar³

et al. 2023

Laser Phys. Lett.

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In this paper, we theoretically study the electron Bernstein wave aided Hermite-Cosh-Gaussian laser beam absorption in collisional plasma with a static magnetic field. This laser beam may have the potential to couple the pre-existing electron Bernstein wave with the coupled wave frequency ω 1 = ω + ω 0 and wave number k 1 = k + k 0 where ω and ω 0 are the electron Bernstein wave and laser beam frequencies, respectively, and k and k 0 are the electron Bernstein wave and laser beam wave numbers, respectively. The plasma electron oscillatory velocities associated with the coupled wave mode produce the linear and nonlinear current density. An expression for the nonlinear absorption coefficient of an electron Bernstein wave aided Hermite cosh-Gaussian laser beam is analytically derived and more concisely discussed via different relative graphs. The graphical results promise that the absorption coefficient is strongly dependent on Hermite mode index m, beam decentered parameter d associated with the cosh term, laser beam width, laser beam frequency, electron Bernstein wave frequency, electron cyclotron frequency, electron thermal velocity and collisional frequency. Nonlinear coupling, collision phenomena and laser beam decentered parameter (very sensitive parameter) play an important role in absorption processes. The association of a very small electron Bernstein wave frequency with the laser beam causes too much of an increase in the absorption coefficient compared to only the laser beam. This efficient nonlinear absorption process may be applicable to plasma electron heating and the harmonic generation process.

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“…The absorption of high-power lasers in plasmas has been an interesting topic for research over the past several years because it offers very promising applications such as fast and shock ignition scenarios in inertial confinement fusion [1,2], plasma heating [3], high-energy beam production [4], plasmabased particle acceleration [5,6], and phenomenological astrophysics [7]. The nonlinear laser energy absorption process in an underdense plasma is considerably supported by converting the laser energy into high-gradient plasma wakefields damped in the plasma through nonlinear effects [8]. In this scenario, the wave-breaking phenomenon occurs for the excited highamplitude plasma wave which causes the excited wave to be nonperiodic, resulting in plasma particle energization by the plasma wave [9,10].…”

Section: Introductionmentioning

confidence: 99%

“…It was demonstrated that in a finite-size plasma backward scattering increases in the presence of an external magnetic field, resulting in the reduction of laser absorption in the environment [18]. This effect can be modified by adding heavy negative ions into the plasma to suppress the scattering process [8]. Furthermore, the role of parametric instabilities in the absorption of high-power lasers in magnetized plasmas [19] as well as in pair-ion plasmas [20] has been previously reported using one-dimensional (PIC) simulation.…”

Section: Introductionmentioning

confidence: 99%

Particle energization by high-power laser pulse in a finite-size electron–positron–ion plasma

Kargarian¹

2020

Laser Phys.

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In this paper, nonlinear laser energy absorption in a finite-size electron-positron-ion plasma is studied in detail, using a two-dimensional relativistic electromagnetic PIC simulation code. It turns out that the laser energy absorption rate in the electron-positron-ion plasma drastically depends on the positron to electron density ratio (α = n p /n e ). This can be attributed to the effects of this parameter on nonlinear phenomena related to laser absorption such as phase mixing and laser scattering. The results illustrate that phase-mixing time is reduced by increasing the defined density ratio, resulting in the enhancement of the laser energy absorption rate. As a significant result, it can be found that in a finite-size electron-positron-ion plasma the absorption rate increases with increasing α as long as laser scattering from the plasma is not considerable. It is shown that for long enough times the absorption rate decreases by increasing α due to stimulated instabilities. The simulation results presented on the phase mixing of nonlinear oscillations as well as on particle energization in electron-positron-ion plasmas are expected to have relevance to laboratory and astrophysical environments.

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Nonlinear absorption of short intense laser pulse in multispecies plasma

Cited by 8 publications

References 29 publications

Plasma diagnostic in a compact IEC-based nuclear fusion device

Plasma diagnostic in a compact IEC-based nuclear fusion device

Electron Bernstein wave aided Hermite cosh-Gaussian laser beam absorption in collisional plasma

Particle energization by high-power laser pulse in a finite-size electron–positron–ion plasma

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