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arXiv 1806.02240physics.plasm-ph
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非线性共振在等离子体系统的相空间中产生大尺度涡旋

Nonlinear resonances generate large-scale vortices in the phase space in plasma systems

Fan Wu, Dmitri Vainchtein, Anton Artemyev

摘要:

众所周知,共振现象会破坏绝热不变性,导致混沌和混合。本文证明了非线性波-粒子共振相互作用可能导致相空间中大尺度相干结构的出现。由于共振上的非线性散射引起的漂移和共振中的捕获(捕获)的组合作用产生了涡旋状结构,其中粒子加速和减速的区域被宏观地分离。同时,非线性散射也产生扩散,导致涡旋周围的混合和均匀化。

英文摘要:

It is well-known that the resonance phenomena can destroy the adiabatic invariance and cause chaos and mixing. In the present paper we show that the nonlinear wave-particle resonant interaction may cause the emergence of large-scale coherent structures in the phase space. The combined action of the drift due to nonlinear scattering on resonance and trapping (capture) into resonance create a vortex-like structure, where the areas of particle acceleration and deceleration are macroscopically separated. At the same time, nonlinear scattering also creates a diffusion that causes mixing and uniformization in around the vortex.

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