第一镜是核聚变等离子体光学诊断的重要组成部分，目前第一镜的主要候选材料为金属材料（如不锈钢、钼、钨等），尽管金属材料具有优良的导热性能等优点，但是也存在很多问题，如不锈钢在粒子的轰击下反射率下降明显，钨和钼等高熔点高硬度金属难以加工获得高质量镜面，反射率较低；由于多晶材料不同取向晶粒间溅射率不同，粒子轰击使得样品表面可观察到明显晶界，从而使反射率下降。我们的前期工作也表明，金属玻璃的耐溅射和耐辐照损伤能力好于晶体材料。本项目选择低活化、高晶化温度的金属玻璃作为第一镜的候选材料，利用不同能量密度的强流脉冲离子束辐照模拟聚变堆的热效应，利用重离子束和强流脉冲离子束辐照模拟未来聚变工况下的等离子体辐照、中子辐照和热效应协同作用对金属玻璃的结构和性能的影响，探索低活化、高晶化温度的金属玻璃作为聚变堆第一镜候选材料的可能性。

First mirror is a key part for nuclear fusion optical diagnostic. At present the main candidate materials are metals such as stainless steels, Mo, and W. Despite of the many advantages for excellent thermal conductivity, metals suffer from serious problems: the reflectivity of stainless steels deteriorates severely after particle bombardments; it is extremely difficult to polish the surface to optical grade for high-melting-point and hard metals such as Mo and W; surface roughness that leads to the decreased reflectivity is easily induced due to the difference in sputtering capabilities in differently-oriented grains. Our previous work showed that some metallic glasses have better anti-sputtering and irradiation-resistance than crystalline materials. The present project selects metallic glasses with low radio-activity and high crystallization temperature to candidate for the first mirror materials. The thermal effects in fusion reactor will be simulated by high-current pulsed ion beam with different energy densities. Synergetic effects from plasma irradiation, neutron bombardments, and thermal effects will be mimicked by heavy ion and high intensity pulsed ion beam irradiation. The present work will explore the possibility of using metallic glasses with low radio activities and high crystallization temperatures as the first mirror materials for fusion reactors.