Because tungsten (W) is used in present fusion devices and it is a reference material for ITER divertor and possible plasma-facing material for DEMO, we strive to understand the response of different W grades to ion bombardment. In this study, we investigated the behavior of mirrors made of four polycrystalline W grades under long-term ion sputtering. Argon (Ar) and deuterium (D) ions extracted from a plasma were used to investigate the effect of projectile mass on surface modification. Depending on the ion fluence, the reflectance measured at normal incidence was very different for different W grades. The lowest degradation rate of the reflectance was measured for the mirror made of recrystallized W. The highest degradation rate was found for one of the ITER-grade W samples. Pre-irradiation of a mirror with 20-MeV W⁶⁺ ions, as simulation of neutron irradiation in ITER, had no noticeable influence on reflectance degradation under sputtering with either Ar or D ions.

由于钨（W）用于当前的聚变设备中，并且是ITER偏滤器的参考材料，也是DEMO可能的面向等离子体的材料，因此我们努力了解不同W级对离子轰击的响应。在这项研究中，我们研究了在长期离子溅射下由四种W等级的多晶W制成的反射镜的性能。从等离子体中提取的氩（Ar）和氘（D）离子用于研究弹丸质量对表面改性的影响。取决于离子通量，对于不同的W等级，在法向入射时测得的反射率差异很大。对于由重结晶的W制成的反射镜，反射率的最低降解率被测量。对于ITER级W样品之一，反射率的降解率最高。用20-MeV W ⁶⁺预反射镜 离子，如在ITER中模拟中子辐照，对使用Ar或D离子溅射时的反射率降低没有明显影响。