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arXiv 1708.04031physics.plasm-ph
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时变流切变对磁化环形等离子体边界非线性稳定性的影响

The effect of time-varying flow-shear on the nonlinear stability of the boundary of magnetized toroidal plasmas

Youngmin Oh, Hyung Ju Hwang, Michael Leconte, Gunsu S. Yun

摘要:

本文提出了一个唯象的、非常一般的广义复Ginzburg-Landau方程模型,用以研究环形磁化高温等离子体边界准周期流体不稳定性(称为边缘局域模)的动力学行为。该模型再现了在KSTAR托卡马克高约束态等离子体中观察到的边界不稳定性的关键动力学特征,包括准稳态,其特征在于场对准的非模态本征模,不同本征模之间的过渡,以及在弛豫之前快速过渡到非模态非模态结构。据发现,列入随时间变化的垂直剪切流是至关重要的再现所观察到的动力学特征。

英文摘要:

We propose a phenomenological yet very general model in a form of generalized complex Ginzburg-Landau equation to understand the dynamics of the quasi-periodic fluid instabilities (called edge-localized modes) in the boundary of toroidal magnetized high-temperature plasmas. The model reproduces key dynamical features of the boundary instabilities observed in the high-confinement state plasmas on the KSTAR tokamak, including quasi-steady states characterized by field-aligned filamentary eigenmodes, transitions between different eigenmodes, and rapid transition to non-modal filamentary structure prior to the relaxation. It is found that the inclusion of time-varying perpendicular sheared flow is crucial for reproducing the observed dynamical features.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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