论文部分内容阅读
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ＳＲＳ行为的两个重要特征参量，即二者有效增长率之比和增长长度之比，并结合数值结果对其进行了讨论。
In view of the actual non-uniform plasma conditions and non-periodic boundary conditions, established stimulated Raman scattering (SRS) and stimulated Brillourin scattering (SBS) nonlinear coupling model. The impact of SBS on SRS is mainly manifested in two aspects: 1) the nonlinear interaction between Langmuir wave and ion acoustic wave, and 2) the competition between SBS and SRS. In this paper, we study the effects of ion-acoustic decay instability and non-resonant scattering of Langmuir waves by ion acoustic waves on the development of SRS. The image of SRS in one-dimensional inhomogeneous plasma is given. Langmuir wave to shortwave conversion, which is strongly damping SRS is an important mechanism to suppress. In this paper, two important characteristic parameters that determine SRS behavior in SBS / SRS coupling process are given, that is, the ratio between the effective growth rate and the growth length, and the numerical results are discussed.