Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment
Degradation of optical reflectivity of in-vessel mirror materials by helium bombardment
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DOI：
10.1016/j.jnucmat.2010.12.205
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发表时间：
2011-02
影响因子：
3.1
通讯作者：
S. Kajita;T. Saeki;N. Ohno;M. Tokitani;T. Hatae;W. Sakaguchi
中科院分区：
文献类型：
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作者：
S. Kajita;T. Saeki;N. Ohno;M. Tokitani;T. Hatae;W. Sakaguchi
实验研究了氦气辐照对钼、铑等容器内镜面材料的影响。在不同的表面温度下，用低入射离子能量的氦等离子体(∼50 eV)照射钼和铑的光学反射率显著降低。表面分析表明，当表面温度较高(1500K)时，钼表面形成纤维状纳米结构，而当表面温度较低(<；1000K)时，表面观察到粗糙的表面。光学反射率的降低是显著的，特别是对于短波长范围，通常小于300 nm。结果表明，在ITER的光学诊断中，应该考虑氦气辐照作为血管内反射镜材料。
The effect of helium irradiation on in-vessel mirror materials, i.e. molybdenum and rhodium, are investigated experimentally. By the exposure to helium plasmas with low incident ion energy (∼50eV) at different surface temperatures, the optical reflectivity of molybdenum and rhodium decreases significantly. From the surface analysis, it is shown that fiberlike nanostructure is formed on molybdenum surface when the surface temperature is high (at 1500K), while rough surface is observed when the surface temperature is low (<1000K). The decrease in the optical reflectivity is significant particularly for short wavelength ranges, typically, less than 300nm. The results indicate that the helium irradiation should be taken into account for in-vessel mirror materials for the optical diagnostics in ITER.