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A mechanism for magnetic field stochastization and energy release during an edge pedestal collapse

机译:边缘基座坍塌过程中的磁场随机化和能量释放的机制

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摘要

On the basis of three-dimensional nonlinear magnetohydrodynamic simulations, we propose a new dynamical process leading to the stochastization of magnetic fields during an edge pedestal collapse. Primary tearing modes are shown to grow by extracting kinetic energy of unstable ballooning modes, eventually leading to the island overlap. Secondary tearing modes, which are generated through a coherent nonlinear interaction between adjacent ballooning modes, play a key role in this process, mediating the energy transfer between primary ballooning and tearing modes. Calculations show that the parallel energy loss through the stochastic fields, which has been identified in early nonlinear simulations, could be a dominant thermal energy release mechanism during an edge pedestal collapse.
机译:在三维非线性磁流体动力学模拟的基础上,我们提出了一种新的动力学过程,该过程导致边缘基座塌陷期间磁场的随机化。通过提取不稳定膨胀模式的动能,可以看出主要的撕裂模式会增长,最终导致岛屿重叠。通过相邻膨胀模式之间的连贯非线性相互作用产生的次级撕裂模式在该过程中起关键作用,介导初级膨胀模式和撕裂模式之间的能量转移。计算表明,在早期非线性模拟中已确定的通过随机场的平行能量损失可能是边缘基座塌陷期间的主要热能释放机制。

著录项

  • 来源
    《Nuclear fusion》 |2015年第3期|032004.1-032004.6|共6页
  • 作者单位

    National Fusion Research Institute, Daejeon 305-333, Republic of Korea;

    National Fusion Research Institute, Daejeon 305-333, Republic of Korea;

    National Fusion Research Institute, Daejeon 305-333, Republic of Korea;

    National Fusion Research Institute, Daejeon 305-333, Republic of Korea;

    National Fusion Research Institute, Daejeon 305-333, Republic of Korea;

  • 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

    ELM; nonlinear; tearing modes; stochastization; energy loss; collisionless diffusion;

    机译:榆树;非线性撕裂模式随机化能量损失;无碰撞扩散;
  • 入库时间 2022-08-18 00:42:30

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