The effect of heavy sputtering and of neutron irradiation simulated by displacement damaging with of 20 MeV W 6+ ions on the optical properties of tungsten mirrors was studied. Ar + ions with 600 eV of energy were used as imitation of charge exchange atoms ejected from fusion plasma. The ion fluence dependence of the surface topography and the optical properties of polycrystalline, recrystallized tungsten (grain size 20 -100 µm) were studied by optical microscopy, interferometry, reflectrometry and ellipsometry. Furthermore, after sputtering in total a layer of 3.9 μm in thickness, the orientation and the thickness of the eroded layer of many individual grains was determined by electron backscattering diffraction and confocal laser scanning microscopy. Concluding from the obtained data the neutron irradiation, at least at the damage level would be achieved in ITER, has not to make an additional contribution in the processes developing under impact of charge exchange atoms only.

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Simultaneous effects of neutron irradiation and long–term sputtering on the surface relief of ITER–grade tungsten were studied. The effects of neutron–induced displacement damage have been simulated by irradiation of tungsten target with W6 + ions of 20 MeV energy. Ar+ ions with energy 600 eV were used as imitation of charge exchange atoms in ITER. The surface relief was studied after each sputtering act. The singularity in the WJ–IG surface relief was ascertained experimentally at the first time, which determines the law of roughness extension under sputtering. As follows from the experimental data, the neutron irradiation has not to make a decisive additional contribution in the processes developing under impact of charge exchange atoms only.

Работа посвящена изучению влияния структуры и размеров зерна на изменение микрорельефа и оптических характеристик образцов зеркал из медных сплавов с существенно различными размерами зёрен при бомбардировке их ионами дейтериевой плазмы. Исследование проведено в рамках решения задачи выбора материала обращённых к плазме зеркал для оптических методов диагностики плазмы в термоядерном реакторе. На основании комплексных исследований структурных особенностей поверхностного слоя образцов зеркал из низколегированных медно-хромовых сплавов сделан вывод об определяющей роли размера зерна на их поведение при воздействии дейтериевой плазмы. Ключевые слова: хромо-циркониевые медные сплавы, первое зеркало, оптические свойства, ионное распыление.

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