2015_Взаимодействие ионов с поверхностью (ВИП)

Постоянный URI для этой коллекции

https://openrepository.mephi.ru/handle/123456789/12318

В коллекцию включены полнотекстовые сборники конференций НИЯУ МИФИ, а также статьи авторов НИЯУ МИФИ. Сортировка "По названию" позволяет вывести сборник в начало поиска.

Обзор

Теперь показываю 1 - 20 из 37

Открытый доступ
О ВОЗМОЖНОСТИ УМЕНЬШЕНИЯ ТЕРМОДЕСОРБЦИИ ИЗ ТИТАНА В ПРОЦЕССЕ ИОННОГО ОБЛУЧЕНИЯ
(НИЯУ МИФИ, 2015) Каплевский, А. С.; Беграмбеков, Л. Б.; Двойченкова, О. А.; Евсин, А. Е.; Захаров, А. М.; Шигин, П. А.; Захаров, Андрей Михайлович; Беграмбеков, Леон Богданович; Евсин, Арсений Евгеньевич
Peculiarities of hydrogen ions interaction with titanium deuteride layer were studied. It was shown that deposition of yttrium oxide layer decreases hydrogen isotopes desorption from titanium layer. Decreasing of deuterium desorption from titanium deuteride under irradiation by hydrogen ions with low energy (<1000 eV) was observed. It was observed even in that case when pulses of irradiation with high energy ions combined with penetration of ions with the energy lower than 1000 eV into the surface.
Открытый доступ
FABRICATION OF FINE-DISPERSED COATINGS AT DEPOSITION WITH SIMULTANEOUS SPUTTERING
(НИЯУ МИФИ, 2015) Rogov, A. V.; Martynenko, Yu. V.; Kapustin, Yu. V.; Belova, N. E.; Мартыненко, Юрий Владимирович
New low temperature method of homogeneous Mo nanocrystallite coating formation was developed. The coating was formed at magnetron Mo deposition on polished Mo polycrystalline substrate with simultaneous ion sputtering. Deposition and sputtering were performed in combined discharge of magnetron – hole cathode [1]. X-ray difractometry and SEM were used for coating structure investigation. A theoretical model was developed for coating formation by proposed method. At low excess of deposition rate over sputtering rate uncontrolled fast growth of some Mocrystallites is effectively suppressed, being fine dispersed coating is formed. Such coatings can be used as a radiation stable reflecting coatings for high temperature plasma diagnostic mirrors [2, 3]. The proposed method can be used also for other materials modification, semiconductors included.
Открытый доступ
FUTURE DIRECTIONS IN EDGE PLASMA PHYSICS AND PLASMA MATERIAL INTERACTIONS IN FUSION DEVICES: SOME RESULTS FROM THE FES COMMUNITY PLANNING WORKSHOPS 2015
(НИЯУ МИФИ, 2015) Krasheninnikov, S. I.
In February 2015, Dr. Ed Synakowski, USDOE FES Associate Director, has announced a set of Community Planning Workshops that are intended to seek community engagement and input for future program planning activities (see the website https://www.burningplasma.org/activities/article=FES%20Community%20Planning%20Wor kshops%202015). Particular objectives of the workshops are: discussion of near- and longterm research tasks, such as experiments that could be performed on existing experimental facilities; possible upgrade of existing facilities and diagnostics capabilities that would enable of enhance the research tasks; identification of areas for which modeling and simulations could be impactful. In my talk I’ll present some results from two of these workshops, scheduled to take place in May-June 2015, which are aimed on the physics of edge plasma and plasma-material interactions in fusion devices.
Открытый доступ
COMPARISON OF EROSION AND DEPOSITION IN JET DURING CARBON AND ITER-LIKE CAMPAIGNS
(НИЯУ МИФИ, 2015) Krat, S.; Gasparyan, Yu.; Pisarev, A.; Mayer, M.; de Saint-Aubin, G.; Bykov, I.; Coad, P.; Likonen, J.; van Renterghem, W.; Ruset, C.; Widdowson, A.; JET-EFDA, contributors; Гаспарян, Юрий Микаэлович; Крат, Степан Андреевич; Писарев, Александр Александрович
Erosion of plasma facing elements in fusion devices is an important question affecting their lifetimes. Redeposition of eroded materials may lead to accumulation of hydrogen isotopes, which makes it an important problem from the perspective of radiological safety. Redeposition in layers with carbon and beryllium could be a channel for hydrogen isotope accumulation.
Открытый доступ
А MODEL OF RADIATION-INDUCED DENSIFICATION OF OXIDE NUCLEAR FUEL
(НИЯУ МИФИ, 2015) Devyatko, Yu. N.; Novikov, V. V.; Khomyakov, O. V.; Chulkin, D. A.; Хомяков, Олег Владимирович
А process of radiation-induced densification of UO2 is analyzed. It is shown that in vicinity of fission fragment tracks the local melting area and zone of plastic yield are formed. It is developed 􀉚 model of closing of pore in the plastic medium due to influence of stress created in fission fragment tracks.
Открытый доступ
ПЛАЗМЕННЫЕ МЕТОДЫ СОЗДАНИЯ ПОВЕРХНОСТНЫХ СЛОЕВ НА ЦИРКОНИИ, ПРЕПЯТСТВУЮЩИХ ПРОНИКНОВЕНИЮ ВОДОРОДА
(НИЯУ МИФИ, 2015) Евсин, А. Е.; Беграмбеков, Л. Б.; Гордеев, А. А.; Евсин, Арсений Евгеньевич; Беграмбеков, Леон Богданович; Гордеев, Алексей Алексеевич
The results of steam tests (T=400°C, p=1 bar) of two methods of protection of zirconium against hydrogenation – plasma irradiation and deposition of yttrium coatings – are discussed. Amount of hydrogen in irradiated sample after 2500 h of exposure to overheated steam was 5 times less than the corresponding value for unirradiated one. Amount of hydrogen in the sample with yttrium coating was almost constant during 4000 h of exposure.
Открытый доступ
ГАЗИФИКАЦИЯ И УДАЛЕНИЕ ПЕРЕНАПЫЛЕННЫХ УГЛЕРОДНЫХ СЛОЁВ ИЗ ПЛАЗМЕННЫХ УСТАНОВОК ВОЗДЕЙСТВИЕМ КИСЛОРОДНО- ОЗОНОВОЙ СМЕСЬЮ
(НИЯУ МИФИ, 2015) Айрапетов, А. А.; Беграмбеков, Л. Б.; Садовский, Я. А.; Садовский, Ярослав Алексеевич; Айрапетов, Алексей Александрович; Беграмбеков, Леон Богданович
The results of gasification rate measurements of carbon films and carbonfiber composite (CFC) under the influence of ozone-oxygen mixture are presented. Gasification rate was found to be 0.4-0.6 μm/hour (220-250 0С, 0.3 bar, 0.6 at% ozone) in case of planar sample and 1 and 2 mm gap with stainless steel walls and 1 mm gap with CFC wall; 15 μm/hour for planar CFC sample (250 0С, 1 bar, 10 at% ozone).
Открытый доступ
CHARACTERISATION OF PLASMA PARAMETERS OF INDUCTIVELY - COUPLED PLASMA SOURCE AND ITS APPLICATION FOR NITRIDING OF STEELS
(НИЯУ МИФИ, 2015) Meshcheryakova, E.; Zibrov, M.; Kaziev, A.; Khodachenko, G.; Pisarev, A.; Казиев, Андрей Викторович; Писарев, Александр Александрович
Inductively coupled plasma (ICP) sources are widely used in many technological applications, including etching of semiconductors, thin film deposition, and surface modification of materials [1]. In particular, ICP plasmas could be attractive for plasma nitriding of metals (steels, titanium, aluminium, etc.) due to the following features: high ionization degree (up to several percent), low pressure (down to 10−4 mbar) that results in increase of energy of ions bombarding a substrate and reduction of their energy spread, and relatively small impurity content in the plasma due to electrodeless nature of the discharge. Consequently, thorough characterization of plasma parameters in ICP sources is essential for revealing the optimal regimes of plasma nitriding.
Открытый доступ
DETERMINATION OF HYDROGEN BINDING ENERGIES WITH DEFECTS IN METALS FROM THERMAL DESORPTION MEASUREMENTS WITH DIFFERENT HEATING RATES
(НИЯУ МИФИ, 2015) Zibrov, M.; Gasparyan, Yu.; Shubina, A.; Pisarev, A.; Писарев, Александр Александрович; Гаспарян, Юрий Микаэлович
Investigation of hydrogen isotope behaviour in plasma-facing and structural components is of great importance for successful development of fusion reactors with magnetic confinement. The hydrogen inventory (especially in the metals with a positive heat of solution) is determined by the presence of defects, which act as trapping sites for hydrogen. Therefore precise determination of defects’ parameters, namely binding energies for hydrogen atoms and their concentration is essential. Thermal desorption spectroscopy (TDS) is a commonly used method for such purposes. The trap parameters are usually determined by fitting of simulated TDS spectra to experimental ones using numerical diffusion-trapping codes, such as TMAP7 [1]. In such approach, the determination of the characteristics of the trapping sites is ambiguous – they act as free parameters in the model and, as a result, one spectrum can be fitted by using several combinations of parameters.
Открытый доступ
СТРУКТУРА И СВОЙСТВА ПОВЕРХНОСТНЫХ СЛОЁВ, ФОРМИРУЕМЫХ МЕТОДОМ МИКРОДУГОВОГО ОКСИДИРОВАНИЯ НА ЦИРКОНИЕВОМ СПЛАВЕ
(НИЯУ МИФИ, 2015) Иванова, С. В.; Лесневский, Л. Н.; Ляховецкий, М. А.; Наговицина, О. А; Иванова, Светлана Владимировна
The composite ceramic coatings on zirconium alloy were formed by microarc oxidation method in the suspension electrolyte. The analysis of structure and features of obtained coatings are presented.
Открытый доступ
ABLATION OF HIGH-Z MATERIAL DUST GRAINS IN EDGE PLASMAS
(НИЯУ МИФИ, 2015) Marenkov, E.; Krasheninnikov, S.; Маренков, Евгений Дмитриевич
Nowadays it is well recognized that dust particles can play an important role in fusion plasma performance and material transport [1]. Therefore, it is important to have a good understanding of the most important processes dust grains encounter in the course of the interactions with fusion grade plasmas. Many fundamentals of grain-plasma interactions were developed by dusty-plasma community. However, grain-plasma interactions in fusion devices have some important distinctions. In particular, in hot and dense fusion plasma environment dust grains ablate rather quickly. The effect of the vapor on grain-plasma interactions can only be neglected for relatively small grains (below ~10 microns). Meanwhile, it is important to know how the vapor “shielding” alters grain-plasma interactions for larger (~100 microns) grains, which may pose significant threat for plasma performance and even result in disruption, especially for the case where these are high-Z material grains.
Открытый доступ
ФОРМИРОВАНИЕ МОНОЭНЕРГЕТИЧНОГО ИОННОГО ПОТОКА ИЗ ПЛАЗМЫ НА ДИЭЛЕКТРИЧЕСКИЙ ОБРАЗЕЦ
(НИЯУ МИФИ, 2015) Подоляко, Ф. С.; Сорокин, И. А.; Гуторов, К. М.; Визгалов, И. В.; Шустин, Е. Г.; Гуторов, Константин Михайлович; Подоляко, Федор Сергеевич; Сорокин, Иван Александрович
The method for producing ion flux with low energy spread for the treatment of dielectric samples is proposed. It is based on plasma potential control for the purpose of maintaining a constant voltage drop between the plasma and surface of the dielectric accumulating a charge. The first experiments on irradiation of dielectric samples in the PR-2 were performed and the energy spectra of ions were measured.
Открытый доступ
РЕГУЛИРОВАНИЕ ПАРАМЕТРОВ ИОННОЙ БОМБАРДИРОВКИ ДЛЯ ПОЛУЧЕНИЯ ТВЕРДОСМАЗОЧНЫХ ПОКРЫТИЙ С УЛУЧШЕННЫМИ СВОЙСТВАМИ
(НИЯУ МИФИ, 2015) Романов, Р. И.; Григорьев, С. Н.; Фоминский, В. Ю.; Волосова, М. А.; Фоминский, Вячеслав Юрьевич; Романов, Роман Иванович
Low-friction WSex coatings were prepared by pulsed laser deposition using two modes, i.e., the deposition under vacuum conditions and the deposition in a buffer gas (He) at a pressure of 2–10 Pa. Gas was used to change the energetic parameters of laser-induced atomic flux and to modify thus the conditions of the coatings growth. The modification of the structure and the composition of the coatings had a significant effect on their tribological behavior.
Открытый доступ
INTERACTION OF LITHUM-DEUTERIUM FILMS WITH ATMOSPHERIC GASES
(НИЯУ МИФИ, 2015) Popkov,A. S.; Krat, S. A.; Gasparyan, Yu. M.; Pisarev, A. A.; Гаспарян, Юрий Микаэлович; Писарев, Александр Александрович; Крат, Степан Андреевич
A choice of plasma-facing materials is one of the key issues in thermonuclear fusion reactor design. Lithium as an element with the low atomic number is a promising material for plasma-facing components (PFC) in fusion installations and a number of experiments at tokamaks already demonstrated many positive effects on plasma operation [1,2]. Lithium can be used for conditioning, PFC on the base of of capillary porous system with liquid lithium are also considered. In any way, one can expect lithium co-deposition with hydrogen isotopes at the surface of PFC and at remote areas. Lithium as a good getter can accumulate high amount of hydrogen isotopes (deuterium, tritium) that can be a problem from the safety reason. Deuterium retention and thermal desorption from lithium films formed in plasma discharge were investigated in this work.
Открытый доступ
VAPOUR SHIELDING OF SOLID TARGETS EXPOSED TO HIGH HEAT FLUX
(НИЯУ МИФИ, 2015) Pshenov, A. A.; Eksaeva, A. A.; Krasheninnikov, S. I.; Marenkov, E. D.; Маренков, Евгений Дмитриевич
The thickness of a Tungsten monoblocks composing future ITER divertor is supposed to be 8 mm only. Severe erosion caused by a high heat fluxes during transients, such as Type I ELMs and disruptions, therefore is a limiting factor to PFCs lifespan. Thermal loads over the range of Q = 0.5−2 MJ/m2 on the timescale of τ = 0.3− 0.6 ms are expected during Type I ELMs. Even larger heat fluxes, of the order of = − Q 0.5 5 MJ/m2 are expected during thermal quench stage of disruption lasting approximately τ = 1 −3 ms [1]. Under the influence of the extreme heat fluxes serious surface modification and cracking of the Tungsten monoblocks is anticipated [2]. Moreover, melting of a thin surface layer is likely. Melt motion contributes seriously to the material erosion [3]. The other sources of erosion are melt splashing, in form of a droplet ejection, and stationary evaporation [4]. These mechanics lead to a cold dense secondary plasma region formation near the irradiated surface. Intense re-radiation of the incident plasma flow energy in the secondary plasma layer results in a significant reduction of the heat flux reaching the target surface [5]. Accounting for this vapour shielding effect is essential to estimate the surface erosion properly. Predicting the divertor plates lifespan therefore requires deep understanding of all the processes mentioned and their interplay.
Открытый доступ
ANALYSIS OF ION FLUXES IN LINEAR PLASMA DEVICES
(НИЯУ МИФИ, 2015) Sorokin, I. A.; Vizgalov, I. V.; Bidlevich, O. A.; Сорокин, Иван Александрович
Analysis of both ion mass-spectrum and plasma parameters is very important for plasma-surface interaction experiments to control discharge regime and ion composition. In linear plasma devices with a magnetic field, it is possible to apply a static mass-spectrometer using magnetic field of plasma device to ion separation with focusing at 180 or 360 degree.
Открытый доступ
СИСТЕМА ЛАЗЕРНОЙ ОЧИСТКИ ПОВЕРХНОСТИ ЗЕРКАЛ ОПТИЧЕСКИХ ДИАГНОСТИК НА ИТЭР
(НИЯУ МИФИ, 2015) Савченков, А. В.; Губский, К. Л.; Кузнецов, А. П.; Никитина, Е. И.; Тугаринов, С. Н.; Бужинский, О. И.; Кузнецов, Андрей Петрович; Губский, Константин Леонидович
The development of cleaning optics and deposition-mitigating techniques is a key factor in the construction and operation of optical diagnostics in ITER. It has been shown that high initial reflection characteristics of optical elements can be recovered by choosing regimes of fiber laser radiation effect on the deposited surface. Experiments on transport of fiber laser radiation to the metal mirror by using system of lens and cleaning showed the possibility of a hardware implementation of methods applicable in the geometry of port-plug ITER.
Открытый доступ
01_Том 2_XXII Международная конференция Взаимодействие ионов с поверхностью «ВИП-2015»
(НИЯУ МИФИ, 2015)
Открытый доступ
01_Том 3_XXII Международная конференция Взаимодействие ионов с поверхностью «ВИП-2015»
(НИЯУ МИФИ, 2015)
Открытый доступ
01_Том 1_XXII Международная конференция Взаимодействие ионов с поверхностью «ВИП-2015»
(НИЯУ МИФИ, 2015)