引用本文: |
Citation: |
计量
- 文章访问数: 3252
- PDF下载量: 493
- 被引次数: 0
引用本文: |
Citation: |
摘要: 鉴于实际中等离子体不均匀性和非周期性边界条件,建立了受激Raman散射(SRS)和受激Brillourin散射(SBS)非线性耦合模型。SBS对SRS的影响主要表现在两方面:1)Langmuir波与离子声波的非线性相互作用,2)SBS与SRS的竞争。本文研究了离子声衰变不稳定性、离子声波对Langmuir波的非共振散射两种非线性过程在SRS发展过程中的作用,给出一维不均匀等离子体中SRS发展图象。Langmuir波向短波转换,从而被强烈阻尼是抑制SRS的重要机制。文中给出了SBS/SRS耦合过程中决定SR
Abstract: Nonlinear behavior of stimulated Raman scattering (SRS) in inhomogeneous plasma is investigated numerically with aperiodic boundary conditions. The effects that modify SRS behavior with stimulated Brillouin scattering (SBS) and Langmuir driven ion fluctuation are 1) nonlinear coupling of Langmuir/ion acoustic wave and 2) energy competition between SRS and SBS. The various processes of the nonlinear coupling which may inhibit SRS are discussed and the SRS evolution features are illustrated in inhomogeneous 1D plasma. Langmuir wave conversion to more strongly damped waves appear to be important to suppress SRS. The γeff,R/γeff,B, the ratio of growth rates of SRS and SBS, and lR/lB, the ratio of growth lengths are presented as two important parameters to define the different paths of simutaneous SRS/SBS evolution. When γeff,Reff,B or lR/lB, SBS is potent to saturate even terminate SRS.