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首页> 外文期刊>Physics of plasmas >Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region
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Stimulated Brillouin scattering behaviors in multi-ion species plasmas in high-temperature and high-density region

机译：高温和高密度区域中多离子物种等离子体中的布里渊散射行为

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摘要

Different IAW modes excited by stimulated Brillouin scattering (SBS) and different SBS behaviors in several plasmas composed of ion species relevant to inertial confinement fusion in the high-temperature and high-density region have been studied by Vlasov-Maxwell simulations. Firstly, the linear theory is taken to analyze the linear process of IAW and SBS in multi-ion species plasmas. Secondly, the nonlinear effects on SBS in CH and AuB plasmas have been studied in detail. Especially, particle trapping will lead to nonlinear Landau damping and nonlinear frequency shift (NFS) of IAW. Particle trapping will decrease IAW Landau damping and make SBS in CH plasmas transform from convective instability in the linear regime into absolute instability. The NFS from particle trapping and harmonic generation in AuB plasmas will lead to a positive shift of the IAW frequency and make the frequency of SBS scattering light experience an obvious negative shift. And, the nonlinear model can give a good explanation of the nonlinear phenomena. Lastly, the saturation mechanisms are analyzed. The main nonlinear saturation mechanisms of SBS include NFS from particle trapping and harmonic generation, energy dissipation by spectrum broadening, and pump depletion. Microscale kinetic simulations of SBS are interesting, difficult, and could have an impact on the current understanding of the instability, particularly in the nonlinear regime where wave-particle interactions contribute to the saturation of reflectivity. Published under license by AIP Publishing.
机译：通过Vlasov-Maxwell模拟研究了由刺激的布里渊散射（SBS）和由与高温和高密度区域相关的离子物种组成的若干等离子体中的不同SBS行为的不同IAW模式。首先，采用线性理论来分析多离子物种等离子体中IAW和SBS的线性过程。其次，已经详细研究了CH和AUB等离子体中的SBS对SBS的非线性效应。特别是，颗粒诱捕将导致IAW的非线性Landau阻尼和非线性频移（NFS）。粒子诱捕将减少IAW Landau阻尼，使CH等离子体中的SBS从线性制度中的对流稳定性转换为绝对不稳定。 A aub等离子体中的粒子捕获和谐波产生的NFS将导致IAW频率的正偏移，使SBS散射光的频率经历明显的负换档。并且，非线性模型可以给出非线性现象的良好解释。最后，分析了饱和机制。 SBS的主要非线性饱和机制包括来自粒子捕获和谐波产生的NFS，通过光谱展会和泵耗尽的能量耗散。 SB的微观动力学模拟有趣，困难，并且可能对当前对不稳定性的理解产生影响，特别是在波粒相互作用有助于反射率饱和的非线性状态下。通过AIP发布在许可证下发布。

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  • 来源
    《Physics of plasmas》 |2019年第5期|共12页
  • 作者

    Feng Q. S.; Zheng C. Y.; Liu Z. J.; Cao L. H.; Wang Q.; Xiao C. Z.; He X. T.;

  • 作者单位

    Inst Appl Phys &

    Computat Math Beijing 100094 Peoples R China;

    Inst Appl Phys &

    Computat Math Beijing 100094 Peoples R China;

    Inst Appl Phys &

    Computat Math Beijing 100094 Peoples R China;

    Inst Appl Phys &

    Computat Math Beijing 100094 Peoples R China;

    Peking Univ Ctr Appl Phys &

    Technol HEDPS Beijing 100871 Peoples R China;

    Hunan Univ Sch Phys &

    Elect Changsha 410082 Hunan Peoples R China;

    Inst Appl Phys &

    Computat Math Beijing 100094 Peoples R China;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
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