Overview metal mirrors` prospects in fusion reactors

A large part of high-temperature plasma diagnostics has to do with plasma electromagnetic radiation in various spectral ranges. The need to find out the spatial profiles of many plasma parameters makes it necessary to have special overview mirrors very close to the confined plasma boundaries. These mirrors should send the plasma radiation to periscopic channels having radiation analyzers and detectors at the output. Due to their closeness to a nuclear fusion condition plasma, the mirrors will be exposed to {gamma}-ray, X-ray, neutron, and charge-exchange atom fluxes only several times less intense than at the reactor first wall. Moreover, the mirror surface will suffer the action of a {approximately}10{sup 10} cm{sup {minus}3} density background plasma, consisting not only of hydrogen and helium ions but also of the fist wall materials` ones. We present below some estimates of mirror materials radiation resistance, regarding their ability to preserve an acceptable surface reflectivity notwithstanding the irradiation-caused deterioration. 15 refs., 3 figs., 1 tab.