Nonlinear development of weak beam–plasma instability
Nonlinear development of weak beam–plasma instability
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弱束等离子体不稳定性的非线性发展
DOI：
10.1063/1.1389863
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发表时间：
2001
影响因子：
2.2
通讯作者：
P. Yoon
中科院分区：
文献类型：
--
作者：
L. F. Ziebell;R. Gaelzer;P. Yoon
在等离子体弱湍流动力学理论的框架下，分析了稀薄电子束、背景、未磁化等离子体、自洽产生的朗缪尔波和离子声波的非线性相互作用。首次得到了完整的弱湍流方程的完整数值解，它显示了电子束分布中常见的平台形成和伴随的准饱和初级朗缪尔波，随后是包括三波衰减和诱导散射过程的完全非线性过程。详细的分析表明，离子的散射是一个重要的非线性过程，它导致了显著的背向散射和长波长的朗缪尔波成分。然而，我们发现衰减过程也是重要的，并且弱朗缪尔湍流的非线性发展严重依赖于初始条件。特别注意了电子-离子温度比、Te/Ti和初始微扰能级。这是他..。
Nonlinear interactions of tenuous electron beam, background, unmagnetized plasma, and self-consistently generated Langmuir and ion-sound waves are analyzed in the framework of plasma weak turbulence kinetic theory. Full numerical solutions of the complete weak turbulence equations are obtained for the first time, which show the familiar plateau formation in the electron beam distribution and concomitant quasi-saturation of primary Langmuir waves, followed by fully nonlinear processes which include three-wave decay and induced-scattering processes. A detailed analysis reveals that the scattering off ions is an important nonlinear process which leads to prominent backscattered and long-wavelength Langmuir wave components. However, it is found that the decay process is also important, and that the nonlinear development of weak Langmuir turbulence critically depends on the initial conditions. Special attention is paid to the electron-to-ion temperature ratio, Te/Ti, and the initial perturbation level. It is f...