The Optical Properties Of Space Solar Telescope After Proton Irradiation

This thesis, Harbin Institute of Technology in this space materials and environmental engineering laboratory space combined radiation space environment simulation equipment to the actual use of EUV solar telescope Al thin film filters and Mo/Si multilayer mirror to simulate the radiation to transmission electron microscopy (TEM) analysis as the main means of proton beam irradiation experiments on samples of the formation of defects inside the material were observed and analyzed to study the radiation effects induced by proton irradiation on the microstructure of the role of optical materials, review and establishment of defects The formation and evolution of clusters as well as optical and mechanical properties of materials, the relationship between the irradiation condition of the material to reveal the mechanism of radiation damage and to improve the anti-radiation properties of the material to provide the necessary theoretical reserve.TEM analysis showed that proton irradiation can be induced in the Al film in the phenomenon of vacancy dislocation loop, and found in the experimental range, with the radiation dose increased, the number of dislocation loop density increases, the sample average size of vacancy cluster defects are increase in vacancies tend to form larger vacancy cluster defects. At the same time filter with nanocrystalline Al by proton irradiation was found in a large number of clusters formed at the boundary ring holes, it is the formation of these holes so that the peak from the Al filter transmission before irradiation increased 12.1% to 15.0% after irradiation, leading to filter optical properties and mechanical properties of a recession.In the different energy and dose of proton irradiation of Mo/Si multilayer mirror irradiated sample surface roughness measurements indicate that after irradiation Mo/Si multilayer mirror surface roughness than before irradiation increased significantly. The increase in surface roughness increases the scattering of light energy which eventually lead to lower reflectivity.Irradiated by Mo/Si multilayer films were observed and analyzed the microstructure was found by proton irradiation Mo/Si multilayer structure is still Chen is cyclical changes, but the identity of the destruction of the structure, local area appear narrower and the Si layer of Mo layer is as wide, and the Mo layer and Si layer width is also not common. Irradiated Mo/Si multilayer film and the interface between layers is more rough than before irradiation, in which we also found that irradiated Mo/Si multilayer film layered structure of the obvious distortions.The results also show that the charged particle radiation damage, proton irradiation will Mo/Si multilayer mirror reflectivity, and the proton energy, the lower the dose the greater the reflectivity of the multilayer films of the more significant. Mainly because of lower energy proton irradiation in the shorter range of material, then the proton in the deposition of multilayer film materials the greater the concentration, the surface coating damage is more significant.