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Bifurcation of temperature and anomalous transport in the boundary region of Wendelstein 7-X

机译：Wendelstein 7-X边界区域的温度分叉和异常输运

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This paper discusses some problems of the island divertor in the Wendelstein 7-X configuration. These islands exist on the iota = 1 surface at the plasma boundary and will be utilized for impurity control in the Wendelstein 7-X experiment. The structure of this island region depends on the plasma pressure and the tendency is to become more and more ergodic with rising plasma pressure. Thermal transport in the divertor region is described by the transport equation, which is inherently three-dimensional. By averaging along the helical geometry of the island, this equation can be reduced to a two-dimensional one describing the temperature distribution in the poloidal plane. In this approximation a strong similarity to tokamak geometry exists. Since the plasma currents modify the islands, a finite-beta equilibrium is computed as the basis of a geometric analysis of divertor action, Anomalous transport strongly affects the width of the scrape-off layer and the width of the wetted area on the divertor target plates; therefore it is investigated how anomalous transport modifies the transport equation. The non-linearity of the radiation losses in the divertor region and the non-linearity of the boundary conditions can lead to a bifurcation of the temperature distribution and to multiple solutions. Some numerical examples of one-dimensional temperature profiles and bifurcated solutions are given. [References: 18]
机译：本文讨论了Wendelstein 7-X配置中的岛式偏滤器的一些问题。这些岛存在于等离子边界处的iota = 1表面上，并将在Wendelstein 7-X实验中用于杂质控制。该岛区域的结构取决于等离子压力，并且随着等离子压力的升高，其趋向于遍历人体的趋势。偏滤器区域中的热传输由传输方程式描述，该方程式本身就是三维的。通过沿岛的螺旋几何形状求平均值，可以将该方程简化为描述极向面温度分布的二维方程。在这种近似中，存在与托卡马克几何形状的强烈相似性。由于等离子流会改变岛，因此将有限β平衡计算为偏滤器作用的几何分析的基础，反常输运会严重影响刮除层的宽度和偏滤器目标板上润湿区域的宽度;因此研究了异常输运是如何改变输运方程的。偏滤器区域中辐射损失的非线性和边界条件的非线性会导致温度分布的分歧和多种解决方案。给出了一维温度分布和分叉解的一些数值示例。 [参考：18]

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