Sputtering effects on mirrors made of different tungsten grades
| Autor: | A.F. Bardamid, S.I. Solodovchenko, Laurent Marot, V.N. Bondarenko, V. S. Voitsenya, V.G. Konovalov, A. F. Shtan, I. V. Ryzhkov, O. V. Ogorodnikova, O.O. Skoryk, P.M. Lytvyn |
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| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Argon Divertor Analytical chemistry chemistry.chemical_element Plasma Tungsten 01 natural sciences 010305 fluids & plasmas Ion Nuclear Energy and Engineering Deuterium chemistry Sputtering 0103 physical sciences General Materials Science Crystallite 010306 general physics |
| Zdroj: | Journal of Nuclear Materials |
| ISSN: | 0022-3115 |
| DOI: | 10.1016/j.jnucmat.2017.10.020 |
| Popis: | Because tungsten (W) is used in present fusion devices and it is a reference material for ITER divertor and possible plasma-facing material for DEMO, we strive to understand the response of different W grades to ion bombardment. In this study, we investigated the behavior of mirrors made of four polycrystalline W grades under long-term ion sputtering. Argon (Ar) and deuterium (D) ions extracted from a plasma were used to investigate the effect of projectile mass on surface modification. Depending on the ion fluence, the reflectance measured at normal incidence was very different for different W grades. The lowest degradation rate of the reflectance was measured for the mirror made of recrystallized W. The highest degradation rate was found for one of the ITER-grade W samples. Pre-irradiation of a mirror with 20-MeV W 6+ ions, as simulation of neutron irradiation in ITER, had no noticeable influence on reflectance degradation under sputtering with either Ar or D ions. |
| Databáze: | OpenAIRE |
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