2015_Взаимодействие ионов с поверхностью (ВИП)

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В коллекцию 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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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.
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Migration, trapping and release of deuterium from tungsten in the presence of high density of defects: theory and experiment
(НИЯУ МИФИ, 2015) Ogorodnikova, O. V.; Огородникова, Ольга Вячеславовна
The most common experimental methods to study hydrogen (H) in a metal are nuclear reaction method (NRA) for depth profile measurements, thermal desorption spectroscopy (TDS) and permeation experiments. Rate equations are used to model experimental data. The diffusivity, solubility, reflection coefficient, surface barrier, binding energies of H with different types of defects and density of defects are input parameters for rate equation model. These parameters can be derived from the first-principle (DFT) calculations, effectivemedium theory (EMT), molecular dynamics (MD) and TRIM calculations. Incorporation of binding energies of deuterium (D) with a vacancy and a dislocation recently calculated by DFT [1,2] and penetration probability and ion range calculated by MD and TRIM [3] in the rate equation model allows us to validate different predictions against experimental data, for the first time. A comparison of the first-principle calculations and calculations by other theoretical models with experimental values can clarify the physics underling the hydrogenmetal interaction and can provide an answer on several important questions, namely, (i) which type of trap corresponds to certain D binding energy, (ii) which is a range of validity of MD and TRIM models and (iii) which process is rate-limited in respect to the D uptake and release in a material.
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ДИНАМИЧЕСКИЕ ЗАКОНОМЕРНОСТИ ИОННОГО ПЕРЕМЕШИВАНИЯ В МНОГОСЛОЙНЫХ ПЛЕНОЧНЫХ СИСТЕМАХ ПОД ВОЗДЕЙСТВИЕМ ПУЧКОВ ИОНОВ С ШИРОКИМ ЭНЕРГЕТИЧЕСКИМ СПЕКТРОМ
(НИЯУ МИФИ, 2015) Волков, Н. В.; Якуткина, Т. В.; Олейников, И. В.; Сысоева, Н. В.
In the present work, the aim is to optimize the process of modifying the surface layers of materials under irradiation by an ion beam of He+ and Ar+ with wide energy spectrum (ses). The analysis of the applicability of several models describing the dynamics of the sputtering process and implantation under the irradiation of the ses-beams.
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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.
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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.
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ERO-PSI CODE FOR NUMERICAL SIMULATION OF EXPERIMENTS ON TUNGSTEN SPUTTERING IN LINEAR PLASMA DEVICE PSI-2
(НИЯУ МИФИ, 2015) Eksaeva, A. A.; Marenkov, E. D.; Borodin, D.; Kirshner, A.; Laenger, M.; Kurnaev, V. A.; Kreter, A.; Маренков, Евгений Дмитриевич
Plasma-wall interaction is one of the recognized issues for thermonuclear reactor performance and seems to be a key direction in fusion researches in the framework of the ITER project [1]. Tungsten (W) has been chosen as a main material for construction of ITER divertor due to its low sputtering at edge plasma temperatures, large melting temperature, and small uptake of tritium.
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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.
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01_Том 1_XXII Международная конференция Взаимодействие ионов с поверхностью «ВИП-2015»
(НИЯУ МИФИ, 2015)
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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.
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УМЕНЬШЕНИЕ ДЕФЕКТНОСТИ НАНОКРИСТАЛЛИТНЫХ ПОКРЫТИЙ НА ПОЛИКРИСТАЛЛИЧЕСКИХ ПОДЛОЖКАХ ПОСЛЕ ИОННОГО РАСПЫЛЕНИЯ С ОДНОВРЕМЕННЫМ НАПЫЛЕНИЕМ
(НИЯУ МИФИ, 2015) Рогов, А. В.; Капустин, Ю. В.; Мартыненко, Ю. В.; Мартыненко, Юрий Владимирович
Two types of structural defects of Mo coatings deposited on the polished Mo polycrystalline substrates were found. Firstly small (~0.1 μm) crystallites with different orientations and sizes are formed on different substrate grains. Secondly many large (~1 μm) inclusions appear on the coating surface. Preliminary buffer layer created in regime of ion sputtering with simultaneous magnetron deposition allows to eliminate the both kind of defects. А theoretical model of the phenomena was developed.
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Metal-ion Penning source for thin films deposition
(НИЯУ МИФИ, 2015) Колодко, Д. В.; Синельников, Д. Н.; Казиев, А. В.; Тумаркин, А. В.; Тумаркин, Александр Владимирович; Колодко, Добрыня Вячеславич; Казиев, Андрей Викторович; Синельников, Дмитрий Николаевич
Recently, research areas dealing with coating processes in a magnetron discharge with melted cathode have experienced intensive development [1–3]. In this mode magnetron discharge is operated in the target's vapour and the plasma in this case is purely metallic. Despite the main contribution to the deposition process is introduced by the vaporized (neutral) component, the coating properties are greatly affected by the ion flux [3]. So, it is important to study the process of deposition by ion flux solely.
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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.
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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.
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ИССЛЕДОВАНИЕ НАКОПЛЕНИЯ ДЕЙТЕРИЯ В БЕРИЛЛИИ ПРИ ОБЛУЧЕНИИ МОЩНЫМИ ИМПУЛЬСНЫМИ ПОТОКАМИ ПЛАЗМЫ
(НИЯУ МИФИ, 2015) Ефимов, В. С.; Гаспарян, Ю. М.; Писарев, А. А.; Куприянов, И. Б.; Порезанов, Н. П.; Ефимов, Виталий Сергеевич; Писарев, Александр Александрович; Гаспарян, Юрий Микаэлович
Deuterium accumulation in beryllium with pulsed power plasma flows irradiation was investigated by means of thermal desorption spectroscopy. Two grades of beryllium (TGP-56FW and S-65C) were analyzed in this work. Deuterium desorbed mainly in the temperature region of 800÷1400 K with a maximum around 1200 K. Deuterium retention in S- 65C beryllium grade was three times higher than in TGP-56FW.
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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.
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ТЕРМОДЕСОРБЦИЯ ДЕЙТЕРИЯ ИЗ РАДИАЦИОННЫХ ДЕФЕКТОВ В ВОЛЬФРАМЕ
(НИЯУ МИФИ, 2015) Рябцев, С. А.; Гаспарян, Ю. М.; Зибров, М. С.; Писарев, А. А.; Писарев, Александр Александрович; Гаспарян, Юрий Микаэлович
Detrapping of deuterium ions from point defects created by pre-irradiation in polycrystalline tungsten has been studied by thermal desorption spectroscopy. Different fluences and ion energies were used to investigate various types of defects. The heating rate β was also varied in different experiments in the range of 0.15-4 K/s to determine detrapping energies from the shift of peak positions.
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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.
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ПРИМЕНЕНИЕ АВТОКОЛЕБАТЕЛЬНОГО ПУЧКОВО-ПЛАЗМЕННОГО РАЗРЯДА ДЛЯ ИМПЛАНТАЦИИ ИОНОВ В ПЫЛЕВЫЕ ЧАСТИЦЫ
(НИЯУ МИФИ, 2015) Коваль, О. А.; Визгалов, И. В.
The use of high voltage auto-oscillatory pulse, generated in the collector circuit of the beam-plasma system PR-2, to control the surface potential of the dust particles, and hence the energy of ion implantation is discussed in this paper. A distinctive feature of the proposed method is the use only of a relatively low voltage and DC power sources. The evolution of the plasma-surface charge exchange instability in the collector chain is accompanied by pulsed injection of high energy electrons. Due to their spatial and temporal compression it is possible to charge dust particles very rapidly. So, we try to transform the collector plate high-voltage pulses into the potential pulses of macro particles.
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01_Том 3_XXII Международная конференция Взаимодействие ионов с поверхностью «ВИП-2015»
(НИЯУ МИФИ, 2015)
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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).