Electron Bernstein wave excitation by beating of two copropagating super-Gaussian laser beam in a collisional nanocluster plasma

Varma, Ashish; Kumar, Asheel

doi:10.1016/j.ijleo.2021.166872

Cited by 25 publications

(5 citation statements)

References 31 publications

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“…The total electron density perturbation of collisional plasma and the electron density perturbation due to electron Bernstein wave [31] can, respectively, be written as…”

Section: Laser Coupling With Electron Bernstein Wavementioning

confidence: 99%

“…The electron Bernstein wave is a particular type of electron cyclotron harmonic with electrostatic characteristics. This electrostatic wave can be excited by the interaction of an electron beam with plasma and the interaction of a laser beam with plasma as well as clustered plasma with a static magnetic field [30][31][32]. The association of an electron Bernstein wave with an extraordinary laser beam causes enhanced second and third harmonic generations in plasma [6,7].…”

Section: Introductionmentioning

confidence: 99%

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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 total electron density perturbation of collisional plasma and the electron density perturbation due to electron Bernstein wave [31] can, respectively, be written as…”

Section: Laser Coupling With Electron Bernstein Wavementioning

confidence: 99%

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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“…Such physical mechanisms can contribute to plasma heating. In References [12][13][14][15] authors reported different mechanisms for EBW excitations in plasma using co-propagating or counter-propagating laser sources in the plasma. These findings explain how the laser-aided excitation of EBW can be useful for plasma heating as well as for tuning the heating rate.…”

Section: Introductionmentioning

confidence: 99%

Oblique Bernstein wave propagation in electron‐ion plasma with electron quantization effects

Hussain

Majeed

Ayub

et al. 2023

Contributions to Plasma Physics

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We have studied the role of electron quantization effects on the dispersion characteristics of the oblique electron Bernstein wave (EBW) in an electron-ion plasma using Vlasov-Poisson model. Our analysis shows that large thermal effects (as compared to quantization effects) give rise to the usual classical results while in the limit of strong magnetic field, the dispersion characteristics changes. The existence of a quantum Bernstein mode has been proposed which appears purely due to the electron quantization effects. The damping of the oblique EBW has also been analyzed in detail and we found that the magnitude of the damping of the wave decreases as we decrease the obliqueness parameter (parallel to perpendicular wavenumber ratio) which agrees with the earlier theoretical and experimental findings. Moreover, the strong quantization effects (ℏΩ e >> 2T) also tend to suppress the damping of EBW which contributes to the stabilization of the waves. The present findings are relevant to the laboratory laser-produced plasmas where strong external magnetic fields exist, and also to the dense astrophysical plasma environments.

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“…In this proposed theory, the nonlinear methods of Hermite-Gaussian and Laguerre-Gaussian laser beam interaction with plasma plays a crucial role as a tuning tool in the excitation mechanism due to the field optimisation [35]. In a similar way, the electron Bernstein wave is excited in collisional nanocluster plasma instead of only magnetized plasma [36].…”

Section: Introductionmentioning

confidence: 99%

Excitation of electron Bernstein waves by beating of two cosh-Gaussian laser beams in a collisional plasma

Kumar

Varma

2021

Laser Phys.

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In this paper, a theoretical study has been proposed for excitation of electron Bernstein waves in collisional plasma with dc magnetic field by nonlinear interactions of two cosh-Gaussian laser beams. The beat wave with frequency ω = (ω 1 − ω 2 ) and wave vector ⃗ k = ⃗ k 1 + ⃗ k 2 , exerts a nonlinear ponderomotive force on electrons. This nonlinear force has the potential to drive the electron Bernstein wave in collisional plasma with dc magnetic field. The convective loss of waves in plasma is also discussed. An analytical formalism is developed for power going into the electron Bernstein wave with respect to total laser power. The variation of normalized potential and power distribution profile as a function of beam direction, normalized beat wave frequency, and normalized collisional frequency is demonstrated to excite Electron Bernstein waves (EBWs) under resonance conditions. The spatial shape of laser beam, optimum laser beam width parameter, decentred parameter, extreme value of electron thermal velocity and cyclotron frequency is proposed for much more excitation. This proposed theory of electron Bernstein wave excitation may be applicable for plasma heating.

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Electron Bernstein wave excitation by beating of two copropagating super-Gaussian laser beam in a collisional nanocluster plasma

Cited by 25 publications

References 31 publications

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

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

Oblique Bernstein wave propagation in electron‐ion plasma with electron quantization effects

Excitation of electron Bernstein waves by beating of two cosh-Gaussian laser beams in a collisional plasma

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