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arXiv 1810.05044physics.plasm-ph
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径向电场对托卡马克无剪切输运势垒的影响

Influence of the Radial Electric Field on the Shearless Transport Barriers in Tokamaks

F. A. Marcus, M. Roberto, I. L. Caldas, K. C. Rosalem, Y. Elskens

摘要:

在托卡马克中,通过修改等离子体电流分布产生的内部输运势垒减少了粒子输运并改善了等离子体约束。内部输运势垒的触发及其对等离子体轮廓的依赖性是一个关键的非线性动力学问题仍在研究中。我们认为发病的无剪切不变曲线等离子体内部创建内部传输障碍。本文用一个不可积的漂移动力学模型来描述漂移波驱动下的粒子输运,并研究托卡马克中的无剪切势垒起始。我们发现,对于目前观察到的等离子体轮廓的无剪切粒子传输势垒可以触发适当修改的电场配置文件和非共振模式的影响,在障碍发病。特别是,我们表明,一个破碎的障碍,可以通过增强非共振模式恢复。

英文摘要:

In tokamaks, internal transport barriers, produced by modifications of the plasma current profile, reduce particle transport and improve plasma confinement. The triggering of the internal transport barriers and their dependence on the plasma profiles is a key nonlinear dynamics problem still under investigation. We consider the onset of shearless invariant curves inside the plasma which create internal transport barriers. A non-integrable drift-kinetic model is used to describe particle transport driven by drift waves and to investigate these shearless barriers onset in tokamaks. We show that for some currently observed plasma profiles shearless particle transport barriers can be triggered by properly modifying the electric field profile and the influence of non-resonant modes in the barriers onset. In particular, we show that a broken barrier can be restored by enhancing non-resonant modes.

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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