Electron temperature T e and density n e have been measured in the divertor island of Wendelstein 7-X by means of a new thermal He-beam system utilizing line-ratio spectroscopy. This system is equipped with a poloidal arrangement of five gas valves that allows to infer 2D plasma profiles T e ( R,Z ) and n e ( R,Z ) across the magnetic island forming the island divertor. A local maximum in T e ( R,Z ) was measured along the flux surfaces located between the island center and the outer separatrix. In the island center, characterized by closed field lines, a clear local minimum in T e was measured, indicating that no direct heat deposition occurs in this region and that the perpendicular heat flux from the core plasma into this domain is small. Increasing the island size leads to a reduction of the connection length in the scrape-off layer (SOL) and to a shift of ...

中文翻译：

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通过氦气的线比光谱法测量Wendelstein 7-X的分流器岛中的等离子体参数

电子温度T e和密度ne已在Wendelstein 7-X的分流器岛中通过采用线比率谱的新型热He-beam系统进行了测量。该系统配有五个气阀的极向布置，可以推断出形成岛偏滤器的磁岛上的二维等离子体轮廓T e（R，Z）和ne（R，Z）。沿着位于岛中心和外层之间的通量表面测量了T e（R，Z）的局部最大值。在以封闭场线为特征的岛中心，测得的T e明显为局部最小值，表明该区域没有直接热沉积，并且从核心等离子体进入该区域的垂直热通量很小。