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arXiv 1702.02696physics.plasm-phastro-ph.SR
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托卡马克中的非线性重连边缘局域模

Nonlinear reconnecting edge localized modes in tokamaks

F. Ebrahimi

摘要:

利用三维电阻磁流体力学数值模拟研究了托卡马克中的非线性边缘局域模。由于非轴对称的重连电流片不稳定性,即所谓的剥离状边缘局域模,在环周围缠绕的相干载流细丝(带状)结构是非线性形成的。这些快速增长的模式饱和打破轴对称电流层隔离等离子体边缘附近,并通过径向向外排出电流和放松它回来,通过重复的松弛周期。边缘局域模产生的局部双向涨落感应电动势(emf),即发电机作用,使轴对称电流密度弛豫,在边缘附近形成电流空穴。

英文摘要:

Nonlinear edge localized modes in a tokamak are examined using global three-dimensional resistive magnetohydrodynamics simulations. Coherent current-carrying filament (ribbon-like) structures wrapped around the torus are nonlinearly formed due to nonaxisymmetric reconnecting current sheet instabilities, the so called peeling-like edge localized modes. These fast growing modes saturate by breaking axisymmetric current layers isolated near the plasma edge and go through repetitive relaxation cycles by expelling current radially outward and relaxing it back. The local bi-directional fluctuation-induced electromotive force (emf) from the edge localized modes, the dynamo action, relaxes the axisymmetric current density and forms current holes near the edge.

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