Effect of mode number on stimulated Brillouin backscattering in inhomogeneous plasmas

IF 0.9 3区物理与天体物理 Q3 PHYSICS, FLUIDS & PLASMAS

High Energy Density Physics Pub Date : 2025-06-21 DOI:10.1016/j.hedp.2025.101214

M. Hashemzadeh

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Abstract

Effects of mode number and intensity of the laser beam on eigenvalues and eigenfunctions of electromagnetic waves in inhomogeneous collisionless and collisional plasmas and their stability to the stimulated Brillouin backscattering are investigated. The nonlinearity in the collisionless is due to the ponderomotive force and the Ohmic heating arises in the collisional case. It is obtained the electric field equation and distribution of the modified electron density in collisionless and collisional plasmas. Eigenmodes and eigenfunctions in the presence of the linear inhomogeneity of the plasma are obtained. it is observed that by increasing the number of modes, the group velocity and amplitude of the electric field decrease. It is also studied the conservation of particles in collisionless and collisional plasmas. It is obtained that the nonlinear electromagnetic waves in collisionless inhomogeneous plasmas are susceptible to stimulated Brillouin backscattering. Finally, it is indicated that by increasing the number of modes, the growth rate of the instability increases.

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模式数对非均匀等离子体中受激布里渊后向散射的影响

研究了激光束的模数和强度对非均匀无碰撞和碰撞等离子体中电磁波本征值和本征函数的影响及其对受激布里渊后向散射的稳定性。无碰撞情况下的非线性是由于有源动力和碰撞情况下的欧姆加热引起的。得到了无碰撞等离子体和碰撞等离子体中修正电子密度的电场方程和分布。得到了等离子体存在线性非均匀性时的本征模和本征函数。观察到，随着模态数的增加，电场的群速度和振幅减小。本文还研究了无碰撞等离子体和碰撞等离子体中粒子的守恒问题。研究了无碰撞非均匀等离子体中的非线性电磁波易受受激布里渊后向散射的影响。最后指出，随着模态数的增加，不稳定性的增长率增大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Energy Density Physics PHYSICS, FLUIDS & PLASMAS-

CiteScore

4.20

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： High Energy Density Physics is an international journal covering original experimental and related theoretical work studying the physics of matter and radiation under extreme conditions. ''High energy density'' is understood to be an energy density exceeding about 1011 J/m3. The editors and the publisher are committed to provide this fast-growing community with a dedicated high quality channel to distribute their original findings. Papers suitable for publication in this journal cover topics in both the warm and hot dense matter regimes, such as laboratory studies relevant to non-LTE kinetics at extreme conditions, planetary interiors, astrophysical phenomena, inertial fusion and includes studies of, for example, material properties and both stable and unstable hydrodynamics. Developments in associated theoretical areas, for example the modelling of strongly coupled, partially degenerate and relativistic plasmas, are also covered.