Suppression of stimulated backward Raman scattering in a magnetized density rippled plasma

Kamboj, Oriza; Ali, Abdirahman Haji; Kant, Niti

doi:10.1007/s11082-022-03937-9

Cited by 6 publications

(3 citation statements)

References 27 publications

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“…SRS has gained considerable attention since the late 1960s owing to its significant potential in the field of Inertial Confinement Fusion. [1][2][3][4] SRS is a noteworthy issue that is not limited to the Inertial Confinement Fusion (ICF) procedure alone. Additionally, this phenomenon poses a noteworthy constraint in various high-power interactions between lasers and plasmas, such as electron acceleration, particularly laser wakefield and beat wave accelerators and THz radiation generation [5][6][7][8][9][10][11][12][13].…”

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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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 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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“…Employing a magnetic field of several tens of Tesla [22] and using the alternating polarization method [23] show a significant reduction in the growth of SRS. Beyond its application in studies relating to laser-plasma instabilities, the imposition of a magnetic field on an ICF target has also been suggested as a way of enabling ignition via the effect of the magnetic field on thermonuclear α-particle motion and electron conductive hotspot cooling [24]. The presence of such a field can thereby help confine charged particles within the hotspot, thereby shifting the boundary for ignition to lower hotspot ρr or lower temperature (or both) [25].…”

Section: Introductionmentioning

confidence: 99%

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

2023

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Stimulated Raman scattering (SRS) is one of the mechanisms limiting power scalingin inertial confinement fusion (ICF). In this work, we demonstrate the effectivesuppression of SRS by the combined effects of static density fluctuations and anazimuthal magnetic field with a propagating chirped laser pulse. In the presence ofan azimuthal magnetic field, chirped laser pulse propagates through a density-rippledplasma and undergoes stimulated-forward Raman scattering (SFRS), resulting intwo radially localized electromagnetic sidebands waves and a lower-hybrid wave.Absolute and growing modes saturate due to ion density fluctuations, which thensuppress instability growth through mode coupling. The modes modified by thecombined effect of chirp and azimuthal magnetic field are effectively damped aftersaturation. As a result, the overall growth rate of the instability reduces. Thecomparison of positive and negative chirp demonstrated that when a positive chirp isbeing used, instability is more effectively suppressed. Based on non-local theory, wehave analyzed the growth of the SFRS for positive and negative chirp and estimatedit for ICF-relevant parameters and observed the effect of the growth rate.

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Suppression of stimulated backward Raman scattering in a magnetized density rippled plasma

Cited by 6 publications

References 27 publications

Suppression of stimulated Raman scattering in magnetized plasma channel

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

Effect of chirp on stimulated-forward Raman scattering in a magnetised plasma with rippled density for fusion applications

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