Storage Ring FELs are one of the primary sources for circularly polarized γ-radiation in various experiments. The achievable energy of this γ-radiation is strongly related to the central wavelength of the UV wavelengths in the FEL. This lasing wavelength, in turn, is determined by the VUV-resonator mirrors, which face a unique set of requirements, including high reflectivity of 94% for a protected system and low losses at a wavelength of 155 nm and below, as well as resistance to intense VUV and γ-radiation. The contribution will show the manufacturing, laser damage caused in the FEL, and damage mitigation strategies.
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