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Effects of magnetic islands on resonant field penetration and toroidal torques at slow plasma flow

机译：慢速等离子体流下磁岛对共振场穿透和环形转矩的影响

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摘要

The presence of a chain of magnetic islands, produced by externally applied tri-dimensional fields at a rational surface, is numerically found to have significant effects on the resonant response, as well as on the associated toroidal torques, in a toroidal tokamak plasma with conventional aspect ratio, strong shaping, and in the regime of slow toroidal flow. With an ad hoc assumption of the local flattening of the equilibrium pressure profile by the islands, it is found that the primary effect is the increasing of the resonant response by islands, at slow flow, due to the reduction of the favourable average curvature effect. This also leads to the reduction of the toroidal torques, in particular that associated with the neoclassical toroidal viscosity. Partial or complete flattening of the local pressure profile, depending on the island size, results in partial or full recovering of the so called constant-φ plasma response regime. Computational results are well fitted by analytic models for the two extreme cases: the case of complete flattening and the case of no flattening of the local pressure.
机译：在数值上发现，在常规表面的托卡马克等离子体中，由外部施加的三维场在合理的表面上产生的磁岛链的存在，对共振响应以及相关的环形转矩具有重大影响。高宽比，强塑形和缓慢的环形流动状态。在临时假设平衡压力使岛局部变平的情况下，发现主要的影响是由于有利的平均曲率效应的减小，岛在缓慢流动时共振响应的增加。这也导致环形扭矩的减小，特别是与新古典环形粘度相关的环形扭矩的减小。取决于岛的大小，局部压力曲线的部分或完全变平导致所谓的恒定φ等离子体响应状态的部分或全部恢复。通过分析模型可以很好地拟合两个极端情况的计算结果：完全展平的情况和局部压力不展平的情况。

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  • 来源
    《Nuclear fusion》 |2017年第12期|321-333|共13页
  • 作者

    L. Li; Y.Q. Liu; N. Wang; F.C. Zhong; Q. Luan; Y. Wang;

  • 作者单位

    College of Science, Donghua University, Shanghai 201620, People's Republic of China;

    General Atomics, PO Box 85608, San Diego, CA 92186-5608, United States of America,Southwestern Institute of Physics, PO Box 432, Chengdu 610041, People's Republic of China;

    State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China;

    College of Science, Donghua University, Shanghai 201620, People's Republic of China;

    School of Mathematical and Physical Sciences, Dalian University of Technology, Panjin 124221, People's Republic of China;

    College of Science, Liaoning Shihua university, Fushun 113001, People's Republic of China,Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    resonant magnetic perturbations; plasma response; GGJ screening effect;

    机译：共振磁扰动血浆反应GGJ筛选效果;

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