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Nonlinear simulations of thermo-resistive tearing mode formalism of the density limit

机译：密度极限的热阻撕裂形式形式的非线性模拟

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摘要

This work is an extension of the previous semi-analytical work (Teng et al 2016 Nucl. Fusion 56 106001), explaining the density limit with a thermo-resistive tearing mode model. The thermo-resistive island growth is calculated with a 3D MHD code M3D-C~1 (Jardin et al 2012 Comput. Sci. Discovery 5 014002). It is shown with nonlinear 3D MHD simulations that impurity radiation stimulates large magnetic islands at the density limit. The impact of thermal perturbations inside and outside of the island is explored. Inside the island, net cooling enhances the island growth and net heating suppresses its growth. Outside the island, thermal perturbations have a much smaller impact on the island growth. When the plasma density is increased towards the density limit, the island changes from being heated to being cooled and grows to a much larger island width. The convergence test of the simulations over the temporal and spatial grid is performed. The numerical model and the semi-analytical model are compared by calculating the △' terms, which are defined in the modified Rutherford equation, and good agreement is observed.
机译：这项工作是对之前的半分析工作（Teng等人，2016 Nucl。Fusion 56 106001）的扩展，使用热阻撕裂模式模型解释了密度极限。使用3D MHD代码M3D-C〜1（Jardin等，2012 Comput。Sci。Discovery 5 014002）来计算热阻岛的增长。非线性3D MHD仿真显示，杂质辐射会在密度极限处激发大的磁岛。探索了岛内外热扰动的影响。在岛屿内部，净冷却促进了岛屿的增长，净采暖抑制了岛屿的增长。在岛外，热扰动对岛的增长影响较小。当等离子体密度朝着密度极限增加时，岛从加热变为冷却，然后增长到更大的岛宽。在时空网格上进行了仿真的收敛性测试。通过计算改进的卢瑟福方程中定义的△'项，比较了数值模型和半解析模型，并观察到了良好的一致性。

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  • 来源
    《Nuclear fusion》 |2018年第10期|106024.1-106024.8|共8页
  • 作者

    Q. Teng; N. Ferraro; D.A. Gates; R.B. White;

  • 作者单位

    Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States of America;

    Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States of America;

    Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States of America;

    Princeton Plasma Physics Laboratory, Princeton University, Princeton, NJ, United States of America;

  • 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

    density limit; tearing mode; impurity radiation; MHD simulation;

    机译：密度极限撕裂模式杂质辐射MHD模拟;

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