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Simulations of edge configurations in quasi-helically symmetric geometry using EMC3-EIRENE

机译：使用EMC3-EIRENE模拟准螺旋对称几何中的边缘配置

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摘要

Simulations of the edge of a quasi-helically symmetric (QHS) stellarator with geometry based on the Helically Symmetric experiment (HSX) are performed using the coupled codes EMC3-EIRENE. The standard configuration of HSX has an island structure outside the separatrix, corresponding to the 8/7 resonance. In addition to the standard configuration, two other configurations are examined: one with small islands outside the separatrix corresponding to the 16/15 resonance, and one with large islands corresponding to the 4/4 resonance. Using EMC3-EIRENE, density scans are employed, while scaling input power linearly with density, in order to determine the transition point from a low- to a high-recycling regime. The small island and the standard cases show markedly similar behaviour, but the large island configuration transitions to high-recycling and detached regimes at significantly lower plasma densities. Reducing the perpendicular diffusion coefficients creates behaviour more consistent with two-point model predictions by reducing the role of perpendicular transport through edge islands and reducing friction loss from counter-streaming parallel flows. When carbon impurities are added, the large island configuration exhibits a large increase in radiated power, while the two configurations with smaller islands do not.
机译：使用耦合代码EMC3-EIRENE对基于螺旋对称实验（HSX）的几何形状的准螺旋对称（QHS）恒星器的边缘进行仿真。 HSX的标准配置在分离线外部有一个岛状结构，对应于8/7共振。除标准配置外，还检查了其他两种配置：一种在分离线外具有对应于16/15共振的小岛，另一种具有对应于4/4共振的大岛。使用EMC3-EIRENE进行密度扫描，同时以密度线性缩放输入功率，以确定从低回收率到高回收率的过渡点。小岛和标准情况显示出明显相似的行为，但是大岛配置在明显降低的血浆密度下过渡到高回收率和分离状态。减少垂直扩散系数，可以减少边缘边缘的垂直传输作用，并减少逆流平行流产生的摩擦损失，从而使行为与两点模型预测更加一致。当添加碳杂质时，大岛状结构的辐射功率显着增加，而具有小岛状的两个结构则没有。

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  • 来源
    《Nuclear fusion》 |2013年第11期|113036.1-113036.11|共11页
  • 作者

    A. Bader; D.T. Anderson; C.C.Hegna; Y. Feng; J.D. Lore; J.N. Talmadge;

  • 作者单位

    University of Wisconsin, Madison, WI, USA;

    University of Wisconsin, Madison, WI, USA;

    University of Wisconsin, Madison, WI, USA;

    Max-Planck Institut fur Plasmaphysik, Greifswald, Germany;

    Oak Ridge National Laboratory, Oak Ridge, TN, USA;

    University of Wisconsin, Madison, WI, 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);
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  • 正文语种 eng
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