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arXiv 2009.01629physics.plasm-ph
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束流-等离子体系统的共振重叠和非线性特性

Resonance overlap and non-linear features of the beam-plasma system

Nakia Carlevaro, Giovanni Montani, Matteo Valerio Falessi

摘要:

在等离子体物理中,从空间到聚变等离子体,束-等离子体不稳定性可以作为简化模型来处理。在本文中,我们回顾和改进这个模型的一些非线性特征。具体而言,通过分析的依赖性的非线性速度扩展的线性增长率的函数,我们讨论了共振的有效尺寸,鉴于其在饱和时的光谱重叠的作用。这种表征的相关性依赖于定量确定重叠度的必要性,以区分自洽动力学的不同传输机制。的分析是丰富的相空间动力学的研究,通过拉格朗日相干结构技术,以定义系统的传输障碍描述的重叠过程的相关功能。最后,我们讨论了相关功能的模式饱和水平。

英文摘要:

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.

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