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Transport and divertor properties of the dynamic ergodic divertor

机译：动态遍历转向器的传输和转向器特性

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The concept of the dynamic ergodic divertor (DED) is based on plasma edge ergodization by a resonant perturbation. Such a divertor concept is closely related to helical or island divertors in stellerators. The base mode of the DED perturbation field can be m = 12/4, 6/2 or 3/1. The 3/1 base mode with its deep penetration of the perturbation field provides the excitation of tearing modes. This topic was presented elsewhere. In this contribution we concentrate on the divertor properties of the DED. We report on the characterization of the topology, transport properties in ergodic fields, impurity transport and density limit behaviour. The 12/4 base where the perturbation is restricted to the plasma edge is suitable for divertor operation. With increasing perturbation field island chains are built up at the resonance layers. Overlapping islands lead to ergodization. The plasma is guided in the laminar region via open field lines of short connection length to the divertor target. The magnetic topology is not only controlled by the coil current but especially by the edge safety factor. For appropriate edge safety factor we observe a strong temperature drop in the plasma edge, indicating an expansion of the laminar region, which is necessary to decouple the divertor plasma from the core plasma. The modifications of the magnetic topology can be directly seen, for example, from carbon emission lines. The magnetic structure is calculated by the ATLAS code and shows good agreement with the experimental findings.
机译：动态遍历偏滤器（DED）的概念基于通过共振扰动进行的等离子体边缘遍历。这种偏滤器的概念与斯特勒机中的螺旋形或岛形偏滤器密切相关。 DED扰动字段的基本模式可以是m / n = 12 / 4、6 / 2或3/1。 3/1基本模式及其对扰动场的深入渗透提供了撕裂模式的激发。该主题在其他地方介绍。在此贡献中，我们将重点介绍DED的分压器特性。我们报告了拓扑的特征，遍历场的传输特性，杂质传输和密度限制行为。扰动仅限于等离子体边缘的12/4基极适用于偏滤器操作。随着扰动的增加，在共振层上建立了岛链。重叠的岛屿导致人类化。等离子体通过短连接长度的开放场线在层流区域中被引导至分流器靶。磁拓扑不仅受线圈电流控制，而且还受边缘安全系数的控制。对于适当的边缘安全系数，我们观察到等离子体边缘的温降很大，这表明层流区域的扩展，这对于将分流器等离子体与核心等离子体解耦是必需的。磁性拓扑的修改可以直接从例如碳排放线中看到。磁结构由ATLAS代码计算得出，并与实验结果非常吻合。

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