Abstract
Diagnostic systems for fusion reactors will require mirrors capable of reflecting electromagnetic radiation in the soft X-ray, near UV, visible, and IR wavelengths. These components will be exposed to significant fluences of fast neutrons during use. Mirrors made from alternating layers of low- Z and high- Z materials were irradiated to a fast neutron fluence of 1.1 × 10 23 n/m 2 at 270–300°C, and subsequently evaluated for structural changes and in some cases changes in optical properties. Short-wavelength mirrors retained their structural integrity while exhibiting slight changes in reflectance; some long-wavelength mirrors showed structural degradation, while others did not. These results are discussed in terms of materials damage effects and possibilities for improvement of mirror performance under severe operating conditions.
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