Publication: SURFACE MODIFICATION AND SPUTTERING EROSION OF IRON EXPOSED TO LOW-ENERGY, HIGH FLUX DEUTERIUM PLASMAS SEEDED WITH METAL SPECIES
Дата
2017
Авторы
ALIMOV, V. KH.
HATANO, Y.
BALDEN, M.
OYAIZU, M.
ISOBE, K.
NAKAMURA, H.
HAYASHI, T.
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НИЯУ МИФИ
Аннотация
Fe targets surrounded with (i) 304 type stainless steel composed of mid-Z elements: Fe, Cr, Ni, and Mn (designated as Fe[304SS] targets) and with (ii) high-Z tungsten (designated as Fe[W] targets) were exposed to low-energy (140 and 200 eV), high flux (about 1022 D/m2s) deuterium (D) plasmas to fluences of 5×1025 and 1026 D/m2 at various temperatures. The surface morphology of the Fe targets is found to be dependent strongly on (i) atomic number of re-deposited species emerged from sputtering of the 304 type stainless steel (mid-Z elements) or tungsten (high-Z element) and on (ii) the exposure temperature. On the Fe[304SS] surface exposed at various temperatures to the D plasmas, only well-known topographical structures resulted from the variations of sput-tering yield with crystal orientation (ridges between different grains) are ob-served. By contrast, nano-structured layers enriched with tungsten are formed on the Fe[W] surfaces. Due to re-deposition of W particles and preferential sputtering of Fe, the effective W concentration in the outermost nano-structured layers reaches 60 at.%. Main physical processes occurring on the Fe[W] sur-face under D plasma exposure and influencing formation of the nano-structured surface layer are assumed to be sputtering, re-deposition, crystallite nucleation and growth due to surface atoms diffusion.
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Цитирование
SURFACE MODIFICATION AND SPUTTERING EROSION OF IRON EXPOSED TO LOW-ENERGY, HIGH FLUX DEUTERIUM PLASMAS SEEDED WITH METAL SPECIES [Текст.] / ALIMOV V.KH. [и др.] // Взаимодействие плазмы с поверхностью: сборник научных трудов XX конференции - 2017. - С. 76