Overview of the plasma-surface interaction on limiter surfaces in the startup campaign of Wendelstein 7-X
Overview of the plasma-surface interaction on limiter surfaces in the startup campaign of Wendelstein 7-X
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DOI：
10.1088/1402-4896/aa8e21
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发表时间：
2017-10
期刊：
影响因子：
2.9
通讯作者：
V. Winters;S. Brezinsek;F. Effenberg;M. Rasinski;O. Schmitz;L. Stephey;C. Biedermann;C. Dhard;H. Frerichs;J. Harris;M. Krychowiak;R. König;T. Pedersen;G. Wurden
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文献类型：
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作者：
V. Winters;S. Brezinsek;F. Effenberg;M. Rasinski;O. Schmitz;L. Stephey;C. Biedermann;C. Dhard;H. Frerichs;J. Harris;M. Krychowiak;R. König;T. Pedersen;G. Wurden
Wendelstein 7-X （W7-X）的首次运行为仿星器等离子体表面相互作用（PSI）的研究提供了良好的环境。利用可见光/红外相机系统和滤光镜系统进行的原位光谱分析表明，初级侵蚀带与限制器上的高热通量区相关。这一分析与尸检分析中发现的侵蚀带相匹配，后者是通过扫描电子显微镜/聚焦离子束/电子色散x射线光谱成像完成的。此外，在这些高热流区的内部发现了一个快速沉积区域。在限制瓦的边缘发现了远刮脱层沉积区域。所有沉积区域都是均匀的，与限制剂的纯碳组成相比，氧含量增加了。冲击热流密度的极向变化遵循3D SOL通量管的印记。这在多大程度上反映在PSI中，将需要进一步的分析和建模。
The first operational campaign of Wendelstein 7-X (W7-X) provided an excellent environment for the study of plasma-surface interaction (PSI) in a stellarator. In situ spectroscopic analysis via a combined visible/infrared camera system and a filterscope system revealed that the primary erosion zone was correlated with the high heat flux regions on the limiter. This analysis matched to where the erosion zone was found in the post-mortem analysis, which was done with scanning electron microscopy/focused ion beam/electron dispersive x-ray spectroscopy imaging. Additionally, a region of prompt deposition was found to the inside of these high heat flux zones. A region of far scrape-off layer (SOL) deposition was found at the edges of the limiter tiles. All deposition regions were identified by their homogeneous, increased oxygen content compared to the pure carbon makeup of the limiters. Poloidal variation of the impinging heat flux follow the imprint of the 3D SOL flux tubes. In how far this reflects in the PSI will require further analysis and modeling.