Physics of island divertors as highlighted by the example of W7-AS
Physics of island divertors as highlighted by the example of W7-AS
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DOI：
10.1088/0029-5515/46/8/006
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发表时间：
2006-07
期刊：
影响因子：
3.3
通讯作者：
Y. Feng;F. Sardei;P. Grigull;K. Mccormick;J. Kisslinger;Detlev Reiter
中科院分区：
文献类型：
--
作者：
Y. Feng;F. Sardei;P. Grigull;K. Mccormick;J. Kisslinger;Detlev Reiter
基于理论分析、数值模拟和实验结果，本文概述了W7-AS中岛屿导流器输送的自一致的物理图景，这是从目前的理解中得出的，记录了过去几年对该主题的理论和实验研究。导流器的关键功能要素，如粒子通量增强、中性筛选、杂质保留、通过杂质线辐射和分离去除热功率，对岛屿导流器进行了检查，并对托卡马克导流器进行了评估。本文着重描述了与特定岛屿拓扑相关的全局刮脱层输运行为，并旨在说明托卡马克和典型螺旋装置在转流器物理特性上的基本异同。本文还展示和分析了太阳辐射场与核心等离子体之间的相关性，以及岛屿分流器在改善整体等离子体性能方面的作用。讨论主要基于简单的模型和估计，而三维建模计算仅用于控制自一致性和确定否则无法获得的基本功能依赖。岛屿导流器物理学是在理论框架内提出的，然而，大多数关键问题与实验结果有关。
Based on theoretical analysis, numerical simulations and experimental results, the paper outlines a self-consistent physics picture of the island divertor transport in W7-AS, as it emerges from the present understanding, documented over the past several years of theoretical and experimental research on the subject. Key function elements of a divertor, such as particle flux enhancement, neutral screening, impurity retention, thermal power removal via impurity line radiation and detachment, are examined for the island divertor and assessed with respect to tokamak divertors. The paper focuses on describing the global scrape-off layer (SOL) transport behaviour associated with the specific island topology and aims at illustrating the elementary differences and similarities in divertor physics between a tokamak and a typical helical device. Shown and analysed are also the correlation between the SOL and core plasma and the role of the island divertor for improving the global plasma performance. Discussion is mainly based on simple models and estimations, while three-dimensional modelling calculations serve only for control of self-consistency and for determining basic functional dependences not accessible otherwise. The island divertor physics is presented within a theoretical frame with most key issues, however, being related to experimental results.