Savchenko A. Diagnostic tungsten mirrors with different structures under the influence of ITER extreme conditions

The thesis is devoted to studying of the main mechanism of erosion and evolution of the surface structure for the two types of tungsten mirrors under the influence of factors that simulate the ITER conditions. The main results about surface roughness under plasma sputtering and optical properties of mirrors have been received with the use of the original optical technique which was developed. At the first time it was shown that W-IG recrystallization leads to stabilization of surface structure and, as a result, optical properties. This fact enables to look W-rc like leading candidate as the ITER first mirror material. AFM-studies of recrystallized W-IG surface allowed formulating the features of thermal profile grooves formation, to determine their nature and contribution to the surface modification of the first mirrors relief. An experimental basis - a multifunctional optical setup is developed and created. It can be used for studying of the optical properties and the surface structure of solids. The results can be used for choosing the plasma optical diagnostic mirrors material.