铝膜反射镜60keV质子辐照效应(英文)

文章研究了在真空和热沉环境下,铝膜反射镜经质子辐照后的光学反射率变化。试验结果表明:60keV质子辐照后,铝膜反射镜反射率发生了明显的变化。随辐照注量的增加,反射率呈单调减少趋势。当辐照注量达到1×1016cm-2时,反射率略有下降,且这种变化首先发生在紫外区。随着辐照剂量进一步增加,反射率明显下降,特别是在波长为250～800nm范围内。经表面形貌分析和机理分析,铝膜反射镜反射率的降低可归结为经质子辐照后铝镜面表面产生了波纹和小丘形貌。

The effects of 60 keV proton irradiation on aluminum film reflector

Under the environment of vacuum and heat sink, the effects of the irradiation of protons with an energy of 60 keV on the optical specular reflectance of Al reflector are studied. The experimental results show that the specular reflectance of the Al film reflector is significantly affected by the irradiation. With increasing fluence, the specular reflectance decreases monotonously. At a low radiation fluence of 1×10¹⁶ cm^-2, the specular reflectance is decreased but slightly, and the change firstly occurs in the ultraviolet region. With a further increase of fluence, a significant decrease of the specular reflectance occurs particularly in the wavelength range of 250~800 nm. The reason for the decrease could be attributed to the appearance of ripples and hillocks on the surface of the Al mirror after the proton irradiation.