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Influence of toroidal rotation on magnetic islands in tokamaks

机译：环形旋转对托卡马克中磁岛的影响

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摘要

The dynamics of magnetic islands including toroidal rotation in tokamaks is studied. It is found that the contribution of toroidal rotation to the dynamics of magnetic islands is mainly through the coupling of magnetic curvature with pressure and density. In the presence of toroidal rotation, pressure and density are poloidal asymmetric. Then, their coupling with magnetic curvature provides a perpendicular current, and a corresponding return parallel current is induced to affect the dynamics of magnetic islands. It is found that the effect of toroidal rotation depends on its magnitude, rather than the shear. It also depends on the relative magnitude of the island propagation frequency to sound frequency. When the Mach number is large enough, the effect of toroidal rotation is stabilizing and dramatic, and overcomes the contribution of polarization current, namely the onset threshold of NTMs increases. Further, it is also suggested that the toroidal rotation plays an important role in the stability of small scale magnetic islands.
机译：研究了托卡马克中磁岛的动力学，包括环向旋转。已经发现，环形旋转对磁岛动力学的贡献主要是通过磁曲率与压力和密度的耦合来实现的。在环形旋转的情况下，压力和密度是极向不对称的。然后，它们与磁曲率的耦合提供垂直电流，并且感应相应的返回并联电流以影响磁岛的动力学。发现环形旋转的影响取决于其大小，而不是剪切力。它还取决于岛传播频率与声音频率的相对大小。当马赫数足够大时，环形旋转的影响稳定且显着，并且克服了极化电流的影响，即NTM的起始阈值增加。此外，还建议环形旋转在小规模磁岛的稳定性中起重要作用。

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  • 来源
    《Nuclear fusion》 |2018年第3期|036008.1-036008.5|共5页
  • 作者

    Huishan Cai; Jintao Cao;

  • 作者单位

    CAS Key Laboratory of Geospace Environment, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China;

    Institute of Physics, CAS, Beijing 100190, 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

    magnetic island; neoclassical tearing modes; toroidal rotation;

    机译：磁岛新古典的撕裂模式;环形旋转;

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