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Nonlinear coupling induced toroidal structure of edge localized modes

机译：边缘耦合模态的非线性耦合诱导环形结构

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摘要

Edge localized modes (ELMs) are magnetohydrodynamic (MHD) instabilities that cause fast periodic relaxations of the strong edge pressure gradient in tokamak fusion plasmas. A novel diagnostic method allows the extraction of toroidal mode numbers, rotation velocities and spatial information during the ELM cycle including the crash. While mode number branches n = 3-6 and n = 8-10 are dominant just before the ELM crash, during the ELM crash n = 2-5 are observed in typical discharges with type-Ⅰ ELMs in the tokamak experiment. These findings are compared to results from nonlinear MHD simulations. Although n = 6 is linearly dominant, nonlinear coupling in which n = 1 is particularly important leads to the dominance of n = 3-5 during the ELM crash, in excellent agreement with experimental observations. The simultaneous occurrence of these modes over a wide radial region leads to high stochasticity and thus increased transport.
机译：边缘局部化模式（ELM）是磁流体动力学（MHD）不稳定性，会导致托卡马克聚变等离子体中强边缘压力梯度的快速周期性松弛。一种新颖的诊断方法可以在包括碰撞在内的ELM循环中提取环形模式编号，旋转速度和空间信息。尽管模式数分支n = 3-6和n = 8-10就在ELM崩溃之前占主导地位，但在托卡马克实验中，在带有I型ELM的典型放电中，n = 2-5出现在ELM崩溃期间。将这些发现与非线性MHD仿真的结果进行比较。尽管n = 6是线性主导，但其中n = 1尤其重要的非线性耦合导致ELM碰撞期间n = 3-5的优势，这与实验观察非常吻合。这些模式在较大的径向区域上同时出现会导致较高的随机性，从而增加了运输。

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  • 来源
    《Nuclear fusion》 |2018年第2期|026011.1-026011.7|共7页
  • 作者

    A.F. Mink; M. Hoelzl; E. Wolfrum; F. Orain; M. Dunne; A. Lessig; S. Pamela; P. Manz; M. Maraschek; G.T.A. Huijsmans; M. Becoulet; F.M. Laggner; M. Cavedon; K. Lackner; S. Guenter; U. Stroth;

  • 作者单位

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany,Physik Department, E28, TUM, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany,Physik Department, E28, TUM, 85748 Garching, Germany;

    CCFE, Culham Science Centre, Oxon, Abingdon, Oxfordshire OX14 3DB, United Kingdom;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Eindhoven University of Technology, Eindhoven, Netherlands,CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France;

    CEA-IRFM, Cadarache, 13108 Saint-Paul-Lez-Durance, France;

    Princeton University, Princeton, NJ 08544, United States of America,Institute of Applied Physics, TU Wien, Fusion@OEAW, 1040 Vienna, Austria;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

    Max-Planck-Institut fuer Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany;

  • 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

    plasma; edge localized mode; nonlinear; mode number; JOREK;

    机译：等离子体;边缘定位模式;非线性模式编号;约克;

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