Onset of stimulated Raman scattering of a laser in a plasma in the presence of hot drifting electrons

Gupta, Devki Nandan; Yadav, Pinki; Jang, Dong-Gyu; Hur, Min Sup; Suk, Hyyong; Khare, Avinash

doi:10.1063/1.4919626

Cited by 16 publications

(9 citation statements)

References 30 publications

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“…The laser-plasma instabilities often change the structure of the laser energy deposited, causing the implosion's symmetry to change. SRS is one of the most critical instabilities in laser-driven fusion because it disperses the incident laser energy and produces hot electrons [2,3,4,5]. The growth rate of stimulated forward Raman scattering decreases significantly when the lower hybrid wave is localised in the presence of an azimuthal magnetic field, according to Sajjal et al [6].…”

Section: Introductionmentioning

confidence: 99%

Stimulated forward Raman scattering in density rippled magnetized plasma

Kamboj

Yadav²,

Kant

2022

J. Phys.: Conf. Ser.

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In inertial confinement fusion, the development of stimulated Raman scattering is observed in the presence of an azimuthal magnetic field and a density rippled plasma. The Gaussian laser beam propagating through a density rippled plasma is amplified by forward Raman scattering in the presence of an azimuthal magnetic field, resulting in two radially localised electromagnetic sideband waves and a lower hybrid wave. It is observed that as the laser power is increased, the growth rate in the presence of density rippled plasma reduces the probability of plasma pre-heating in ICF.

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Section: Introductionmentioning

confidence: 99%

Stimulated forward Raman scattering in density rippled magnetized plasma

Kamboj

Yadav²,

Kant

2022

J. Phys.: Conf. Ser.

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“…IOP Publishing doi:10.1088/1742-6596/2663/1/012005 2 Gupta et al [18] investigated at the SRS of laser in a plasma. Through numerical demonstrations, they have shown that relativistic effects significantly enhance the amplitude and growth rate of the decay waves, as well as the growth rate of the Raman instability.…”

Section: Introductionmentioning

confidence: 99%

Suppression of stimulated Raman scattering in magnetized plasma channel

Khan,

Kamboj,

Kant

et al. 2023

J. Phys.: Conf. Ser.

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The current study illustrates the occurrence of Stimulated Raman Scattering (SRS) within a plasma channel characterized by magnetized density conditions. Stimulated forward Raman scattering takes place when a laser beam with a q-Gaussian profile traverses a plasma while being exposed to a wiggler magnetic field. The coupling between the applied magnetic field and the generated Langmuir wave ensures the Raman process generation. As a result, second Langmuir wave is produced which remains strongly damped on the electrons. An external magnetic field is employed for the effective suppression of the SRS. The initial enhancement in the growth rate is observed with the magnetic field and after attaining the maxima, it suppresses with the growth rate.

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“…The intricate interplay between laser and plasma gives rise to a host of nonlinear phenomena, including self-focusing of propagating beams [7][8][9][10][11][12], filamentation [13], self-phase modulation [14], finite pulse effect [15], second harmonic generation [16], as well as the emergence of parametric instabilities [17] such as stimulated Brillouin scattering, stimulated Raman scattering (SRS) [18][19][20] and two-plasmon decay [21]. During the propagation of a laser beam through plasma, a portion of its energy is reflected due to the presence of various parametric instabilities, which assume critical significance in the context of ICF.…”

Section: Introductionmentioning

confidence: 99%

Stimulated Raman scattering by circularly polarized quadruple Gaussian laser beam and co-propagating electron beam in plasma

Kamboj,

Teotia,

Kant

2023

Laser Phys.

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This study investigates the interplay between a co-propagating relativistic electron beam and a quadruple Gaussian laser beam in plasma, focusing on the suppression of stimulated Raman scattering (SRS) growth. The presence of the laser beam induces the excitation of a pair of plasma waves and side-scattered electromagnetic waves. As the side-scattered wave and pump wave couple together, they exert a ponderomotive force on the electron beam and plasma electrons, resulting in an enhancement of the plasma wave amplitude. Nonlinear coupling between the density perturbation in the plasma, induced by the plasma wave, and the pump wave leads to the excitation of a nonlinear current responsible for the growth of the side-scattered electromagnetic wave associated with SRS. Furthermore, the growth rate of SRS is shown to be highly sensitive to the phase matching between the relativistic electron beam and the plasma wave. In cases of phase mismatch, the growth rate experiences a significant reduction. Additionally, the effectiveness of the electron beam in driving the stimulated Raman process is greatly affected by the energy spread of the electron beam. A substantial reduction in effectiveness is observed due to this energy spread.

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Onset of stimulated Raman scattering of a laser in a plasma in the presence of hot drifting electrons

Cited by 16 publications

References 30 publications

Stimulated forward Raman scattering in density rippled magnetized plasma

Stimulated forward Raman scattering in density rippled magnetized plasma

Suppression of stimulated Raman scattering in magnetized plasma channel

Stimulated Raman scattering by circularly polarized quadruple Gaussian laser beam and co-propagating electron beam in plasma

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