第一镜是核聚变等离子体光学诊断的重要部件。尽管金属材料具有优良导热性等优点，金属材料(如不锈钢、钼、钨等)作为第一镜也存在载能粒子的轰击溅射和杂质再沉积引起的镜面污染问题，不能满足聚变装置要求。前期工作表明，金属玻璃的耐溅射和耐辐照损伤能力好于晶体材料。Fe基金属玻璃因为大的过冷液相区、高的晶化温度等特性具有更好的非晶稳定性，且不含中子活化元素，Fe基金属玻璃有可能成为第一镜的候选材料。Fe基金属玻璃的非晶稳定性是制约其应用的关键，研究其中子辐照非晶稳定性和热稳定性至关重要。本项目拟用强流脉冲离子束辐照模拟聚变堆的热效应，研究Fe基金属玻璃的热稳定性机理；利用H+/He+离子束辐照模拟聚变堆中的中子辐照效应，研究Fe基金属玻璃的中子辐照稳定性的微观物理机制；同时探讨热效应和H+/He+离子束辐照效应的协同作用对Fe基金属玻璃的非晶稳定性影响，探索Fe基金属玻璃作为聚变堆第一镜候选材料可能性

The first mirror is an important componet of optical diagnostic in nuclear fusion devices. Dispite the metals such as stainless steel, molybdenum and tungsten own good thermal performance and other excellent properties, the mirror pollution issues caused by the sputtering of energetic particles and the redeposition of impurities exist in them which limits their applications in the nuclear fusions. Our previous works indicate that the anti-irradiation and sputtering resistance of metallic glasses are better than those of metal material. Fe-based metallic glasses may be choosen as a candidate of the first mirror due to their wide supercooled liquid region, high crystallization temperature, good stability of amorphous and the absence of neutron activation element. The amorphous stability of Fe-based metallic glasses is the key factor which limits the application of the metallic glasses, so the researches of amorphous stability and thermal stability under neutron irradiation are of greatest importance. In this project, the high-intensity pulsed ion beam is used to irradiate Fe-based metallic glasses to simulate the heat effect in nuclear fusion and research the mechanism of thermostability of Fe-based metallic glasses; the H+/He+ ion beam irradiation is used to simulate the neutron irradiation effect in nuclear fusions and study the microscopic physical mechanism of neutron irradiation stability of Fe-based metallic glasses; the synergistic effect of heat and H+/He+ ion beam irradiation on the amorphous stability of Fe-based metallic glasses is also discussed to investigate the probability of which Fe-based metallic glasses apply as a candidate of the first mirror in nuclear fusion.