受激布里渊散射（SBS）发生在等离子体临界密度以下较广的参数区域，对等离子体组分、流空间分布、光束匀滑方式非常敏感，SBS的预测和抑制对ICF点火成功非常重要。我们针对典型多组分等离子体参数区域和真实光束的匀滑特性，改进和建立适于多光束多组分等离子体中SBS研究的流体力学和动理学模拟程序，研究不同等离子体组分、状态下SBS激发和非线性演化行为。厘清离子声波足够强时非线性动理学效应还是非线性流体力学效应占主导的关键控制参数，以及不均匀流等离子体中发生SBS自共振增强的条件、机理。给出匀滑光束中光斑间相干耦合、光束偏振态和带宽的改变等因素对SBS影响。研究等离子体流速度的扰动和调制降低SBS的机理，利用多光束耦合改变等离子体状态抑制SBS的条件。项目与激光聚变物理和实验密切相关，得到的成果可以增强对SBS及相关过程的精确预测和控制能力。

Stimulated Brillouin scattering(SBS), which can occur throughout the underdense plasma, is sensitive to the plasma ion species,spatial distribution of flow velocity, and the characteristic of smoothing beams, so the prediction and suppression on SBS are of great importance to the success of ICF. We study the excitation and nonlinear evolution of SBS in different plasma species and conditions by the improved multibeam fluid and kinetic computational models. For large amplitude ion wave, we indentify the key controlling parameters to determine whether the nonliner kinetic effect or fluid effects is dominat, and give the conditions of enhanced SBS due to autoresonant of ions wave in inhomogeneous flowing plasmas. The influence of collective coupling between speckles in smoothing beam、varieties of polarization and bandwidth on SBS is investagited. The mitigation of SBS by fluctuation and modulation in the flow velocity is studied. The requiements to supress SBS by multibeam coupling are given. The project has close relation with laser fusion physics and experiments,and the achievements can enhance the acurrate predictive and control capabilities on SBS and related processes.