论文标题
横梁血浆系统的共振重叠和非线性特征
Resonance overlap and non-linear features of the beam-plasma system
论文作者
论文摘要
在从空间到融合等离子体的几种情况下，可以将梁的不稳定性作为减少模型来解决。在本文中，我们审查并完善了该模型的一些非线性特征。具体而言，通过分析非线性速度扩散的依赖性作为线性生长速率的函数，我们鉴于其在饱和度处的光谱重叠中的作用，讨论了共振的有效大小。这种表征的相关性依赖于对重叠度进行定量确定以区分自我一致动力学的不同运输方式的必要性。通过Lagrangian连贯的结构技术对相位空间动力学的研究丰富了分析，以定义系统的传输障碍，描述了重叠过程的相关特征。最后，我们讨论与模式饱和度相关的相关特征。
The beam-plasma instability can be addressed as a reduced model in several contexts of plasma physics, from space to fusion plasma. In this paper, we review and refine some non-linear features of this model. Specifically, by analyzing the dependence of the non-linear velocity spread as a function of the linear growth rate, we discuss the effective size of the resonance in view of its role in the spectral overlap at saturation. The relevance of this characterization relies on the necessity of a quantitative determination of the overlap degree to discriminate among different transport regimes of the self consistent dynamics. The analysis is enriched with a study of the phase-space dynamics by means of the Lagrangian Coherent Structure technique, in order to define the transport barriers of the system describing the relevant features of the overlap process. Finally, we discuss relevant features related to the mode saturation levels.
