Resonance overlap and nonlinear features of the beam–plasma system

N. Carlevaro, G. Montani, M. Falessi
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引用次数: 2

Abstract

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.
光束-等离子体系统的共振重叠与非线性特性
从空间到聚变等离子体,束等离子体不稳定性可以作为等离子体物理的几种情况下的简化模型来处理。本文回顾并改进了该模型的一些非线性特征。具体地说,通过分析非线性速度扩展作为线性增长率的函数的依赖关系,我们讨论了共振的有效尺寸,考虑到它在饱和时的频谱重叠中的作用。这种表征的相关性依赖于定量确定重叠程度的必要性,以区分自洽动力学的不同输运机制。利用拉格朗日相干结构技术对相空间动力学进行了丰富的研究,以定义描述重叠过程相关特征的系统的输运势垒。最后,我们讨论了与模式饱和水平相关的相关特征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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