入射质子能量对银膜反射镜光学性能的影响

Effect of proton energy on optical property of Ag/fused-quartz reflector

为探讨空间高能质子模拟试验方法,用基于蒙特卡罗方法的SRIM程序计算了质子在石英玻璃基银膜反射镜中的射程和能量损失分布,试验研究了不同能量质子辐照对反射镜光学性能的影响.能量低于160keV时,50%以上的质子能量损失在表面膜中,随着能量的增大,质子在膜系中的能量损失逐渐减小;在1016/cm2注量条件下,100keV质子辐照引起350～500nm波段反射率明显下降,而0.5MeV和1MeV质子辐照对光谱的影响很小;计算与试验结果表明,低能质子辐照对反射镜的膜系损伤起主要作用,在进行空间质子辐照模拟试验时,能量选取应低于200keV.

To explore experimental approach to simulate the space high-energy proton, energy loss distribution and shooting range of proton in a silver film reflector on quartz glass were calculated using SRIM program based on Monte Carlo method, while the effect of proton irradiation with varied energy on the optical property of the reflector was investigated. It is found that more than 50% energy is dissipated in the surface film system when the energy is lower＇ than 160 keV. The energy loss in film system is decreased with the increasing energy. Under the fluence of 10^16/cm^2, the optical reflectance within the wavelength of 350 - 500 nm decreases obviously due to 100 keV proton irradiation, whereas a little change occurs for 0. 5 and 1 MeV proton irradiation. The calculated and tested results show that, low-energy proton radiation has dominant effect on the damage of film system for the reflector, indicating that the energy used in space proton simulation test should be lower than 200 keV.