Взаимодействие плазмы с поверхностью
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В коллекции включены полнотекстовые сборники конференций НИЯУ МИФИ, а также статьи авторов НИЯУ МИФИ. Сортировка "По названию" позволяет вывести сборник в начало поиска.
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Просмотр Взаимодействие плазмы с поверхностью по Автор "BALDEN, M."
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- ПубликацияОткрытый доступDEUTERIUM RETENTION IN DENSE AND DISORDERED NANOSTRUCTURED TUNGSTEN COATINGS(НИЯУ МИФИ, 2017) OGORODNIKOVA, O. V.; RUSET, C.; DELLASEGA, D.; PEZZOLI, А.; PASSONI, M.; SUGIYAMA, К.; GASPARYAN, YU.; EFIMOV, V.; BALDEN, M.; MATERN, G.; KOCH, F.; Огородникова, Ольга Вячеславовна; Ефимов, Виталий Сергеевич; Гаспарян, Юрий МикаэловичThree types of nano-structured tungsten (W) coatings were investigated in respect to deuterium (D) retention after the low-energy D plasma exposure. The D depth profile was measured up to 6 μm by nuclear reaction analysis (NRA) and the total deuterium retention was measured by thermal desorption spectros-copy (TDS). In the present work, we investigated (i) a dependence of the D retention in a W coating on substrate, (ii) a dependence of the D retention in a W coating on the nano-crystalline structure, namely, columnar-like or amor-phous-like, and (iii) the D retention at an interface between layers. It was shown that most of deuterium is trapped in the interlayer between W coating and substrate. Consequently, the D retention in the interlayer between different materials can be a concern. It was found that all types of coatings show higher D accumulation compared to bulk polycrystalline W. The disodered W coating produced by Pulsed Laser Deposition (PLD) has highest deuterium (D) concen-tration compared to dense W coating produced by Combined Magnetron Sput-tering and Ion Implantation (CMSII) technology and W coating produced by standard vacuum magnetron-sputtering (SMS) method. The lowest D concen-tration was found in SMS-W coating. No significant influence of the substrate on the D retention in coatings was found. The D retention correlates with mi-crostructure of multilayer W coating: the D retention drastically increases with decreasing the grain size. Consequently, from point of view of the hydrogen isotope retention, coarse-grained crystals are recommended for application of W-based materials in fusion devices. At the same time, coarse-grained crystals are undesirable from point of view of blister formation under the plasma expo-sure. Nano-crystalline structure of W coatings suppresses the blister formation. A compromise in the development of new promising nanostructured tungsten films is necessary to keep the hydrogen concentration at an acceptable level and reducing/preventing high density of defects at the interface between nanostruc-tured coating and substrate.
- ПубликацияОткрытый доступSURFACE MODIFICATION AND SPUTTERING EROSION OF IRON EXPOSED TO LOW-ENERGY, HIGH FLUX DEUTERIUM PLASMAS SEEDED WITH METAL SPECIES(НИЯУ МИФИ, 2017) ALIMOV, V. KH.; HATANO, Y.; BALDEN, M.; OYAIZU, M.; ISOBE, K.; NAKAMURA, H.; HAYASHI, T.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.
- ПубликацияОткрытый доступСРАВНЕНИЕ ЭРОЗИИ И ОСАЖДЕНИИ НА ВНУТРЕННЕЙ СТЕНКЕ JET С ИТЭР-ПОДОБНОЙ И УГЛЕРОДНОЙ СТЕНКАМИ(НИЯУ МИФИ, 2014) КРАТ, С. А.; ГАСПАРЯН, Ю. М.; ПИСАРЕВ, А. А.; БЫКОВ, И.; MAYER, М.; DE SAINT AUBIN, G.; BALDEN, M.; LUNGU, С.; WIDDOWSON, А.; Писарев, Александр Александрович; Гаспарян, Юрий Микаэлович; Крат, Степан АндреевичЭрозия материалов обращённых к плазме элементов термоядерных ус-тановок – важный вопрос с точки зрения времени жизни этих установок. В рамках проекта ИТЭР планируется использование бериллия в качестве материала первой стенки токамака. В 2010ом году на токамака JET (Joint European Thorus) была произведена замена внутренней стенки с углерод-ной на ИТЭР-подобную, составленную из бериллия из вольфрама. В этой работе представлены результаты измерений эрозии внутренней стенки токамака JET за экспериментальную кампанию 2011-2012 годов в срав-нении с данными для кампаний 2001-2004 и 2005-2009 годов.