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Theoretical issues on the spontaneous rotation of axisymmetric plasmas

机译：轴对称等离子体自发旋转的理论问题

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摘要

An extensive series of experiments have confirmed that the observed 'spontaneous rotation' phenomenon in axisymmetric plasmas is related to the confinement properties of these plasmas and connected to the excitation of collective modes associated with these properties (Coppi 2000 18th IAEA Fusion Energy Conf. (Sorrento, Italy, 2000) THP 1/17, www-pub.iaea.org/MTCD/publications/PDF/csp_008c/htmlode343.htm and Coppi 2002 Nucl. Fusion 42 1). In particular, radially localized modes can extract angular momentum from the plasma column from which they grow while the background plasma has to recoil in the direction opposite to that of the mode phase velocity. In the case of the excitation of the plasma modes at the edge, the loss of their angular momentum can be connected to the directed particle ejection to the surrounding medium. The recoil angular momentum is then redistributed inside the plasma column mainly by the combination of an effective viscous diffusion and an inward angular momentum transport velocity that is connected, for instance, to ion temperature gradient (ITG) driven modes. The linear and quasi-linear theories of the collisionless trapped electron modes and of the toroidal ITG driven modes are re-examined in the context of their influence on angular momentum transport. Internal modes that produce magnetic reconnection and are electromagnetic in nature, acquire characteristic phase velocity directions in high temperature regimes and become relevant to the 'generation' of angular momentum. The drift-tearing mode, the 'complex' reconnecting mode and the m~0 = 1 internal mode belong to this category, the last mode acquiring different features depending on the strength of its driving factor. Toroidal velocity profiles that reproduce the experimental observations are obtained considering a global angular momentum balance equation that includes the localized sources associated with the excited internal electrostatic and electromagnetic modes besides the appropriate diffusive and the inward angular momentum transparent terms.
机译：大量的实验已经证实，在轴对称等离子体中观察到的“自发旋转”现象与这些等离子体的约束特性有关，并且与激发与这些特性相关的集体模态有关（Coppi 2000年，第18届IAEA聚变能大会。（索伦托，意大利，2000年）THP 1/17，www-pub.iaea.org / MTCD / publications / PDF / csp_008c / html / node343.htm和Coppi 2002 Nucl。Fusion 42 1）。特别地，径向局部模式可以从等离子柱中提取角动量，并且背景等离子体必须在与模式相速度相反的方向上反冲，而角动量从中增长。在边缘处激发等离子体模式的情况下，其角动量的损失可能与定向粒子向周围介质的喷射有关。然后，主要通过有效粘性扩散和向内角动量传输速度（例如，与离子温度梯度（ITG）驱动模式相关）的组合，将反冲角动量重新分配到等离子柱内。在无碰撞俘获电子模式和ITG环形驱动模式的线性和准线性理论对角动量传输的影响的背景下，对其进行了重新检验。内部模式产生磁重连，本质上是电磁的，在高温状态下获取特征相速度方向，并与角动量的“生成”相关。漂移消除模式，“复杂”重新连接模式和m〜0 = 1内部模式属于此类，最后一种模式根据其驱动因素的强度而具有不同的功能。考虑到整体角动量平衡方程，可以获得重现实验观察结果的环形速度剖面，该方程除了适当的扩散和向内角动量透明项外，还包括与激发的内部静电和电磁模式相关的局部源。

著录项

  • 来源
    《Nuclear fusion》 |2014年第9期|093001.1-093001.12|共12页
  • 作者

    B Coppi; T Zhou;

  • 作者单位

    Massachusetts Institute of Technology, Cambridge, MA, 02139, USA;

    Massachusetts Institute of Technology, Cambridge, MA, 02139, USA;

  • 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 modes; spontaneous rotation; angular momentum transport;

    机译：等离子模式自发旋转角动量传输;

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