Influence of Erosion and Deposition on Metallic First Mirror in HT-7 Tokamak
Influence of Erosion and Deposition on Metallic First Mirror in HT-7 Tokamak
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DOI：
10.1088/1009-0630/14/8/05
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发表时间：
2012-08
影响因子：
1.7
通讯作者：
Jing Chen;R. Yan;Junling Chen
中科院分区：
文献类型：
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作者：
Jing Chen;R. Yan;Junling Chen
在 HT-7 托卡马克中进行了专门的实验，以研究侵蚀和沉积对镜子样品的影响。将由多晶（PC）不锈钢（SS）、钼（Mo）和钨（W）制成的第一镜（FM）样品以与水平面成45°角固定在支架上，并沿磁场以不同的连接长度设置在不同位置。在等离子体暴露之前和之后通过分光光度计测量第一镜的光学反射率。研究发现，随着镜面到托卡马克等离子体最后闭合通量面（LCFS）距离的不同，曝光后镜面样品的表面形貌和镜面反射率也有所不同。研究还发现，缩短镜面前的连接长度会减弱等离子体侵蚀和杂质沉积对镜面的影响。为了保持镜面的光学特性，需要采用原位清洁和镜面保护技术。
Dedicated experiments in the HT-7 tokamak were performed to investigate the influence of erosion and deposition on the mirror samples. The first mirror (FM) samples made of polycrystalline (PC) stainless steel (SS), molybdenum (Mo) and tungsten (W) were fixed on a holder at an angle of 45° with respect to the horizontal plane and set at different locations with different connection lengths along the magnetic field. The optical reflectivity of the first mirror was measured by a spectrophotometer before and after plasma exposure. It was found that the surface morphology and specular reflectivity of the mirror samples after the exposure were different with respect to the different distances from the mirror surface to the last closed flux surface (LCFS) of the plasma in the tokamak. It was also found that shortening the connection length before the mirror surface would weaken the influence of the plasma erosion and impurity deposition on the mirror surface. In order to maintain the optical characteristics of the mirror surface, it is necessary to adopt the in-situ cleaning and mirror protection techniques.