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

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 10¹⁶/cm², 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.