2019_Взаимодействие ионов с поверхностью (ВИП)
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- ПубликацияОткрытый доступЧИСЛЕННАЯ МОДЕЛЬ ВРЕМЯПРОЛЕТНОГО АНАЛИЗАТОРА ДЛЯ ПУЧКА КЛАСТЕРНЫХ ИОНОВ Ar(НИЯУ МИФИ, 2019) Бакун, А. Д.; Гусев, А. С.; Каргин, Н. И.; Колодко, Д. В.; Рындя, С. М.; Сигловая, Н. В.; Агейченков, Д. Г.; Гусев, Александр Сергеевич; Колодко, Добрыня Вячеславич; Рындя, Сергей Михайлович; Каргин, Николай Иванович; Бакун, Алексей Дмитриевич; Сигловая, Наталия ВладимировнаPolishing with cluster ions makes it possible to obtain nanorelief on various materials. Often in such installations, the ion mass distribution is not known reliably. This paper presents the results of a time-of-flight mass analyzer simulation. The time-of-flight analyzer will be used for separation of cluster ions on the Exogenesis nAccel 100 unit.
- ПубликацияОткрытый доступРАДИАЦИОННОЕ УПЛОТНЕНИЕ УРАН-ГАДОЛИНИЕВОГО ТОПЛИВА(НИЯУ МИФИ, 2019) Девятк, Ю. Н.; Новиков, В. В.; Хомяков, О. В.; Новиков, Владимир Владимирович; Хомяков, Олег ВладимировичA model of radiation-induced densification of uranium-gadolinium fuel was developed. The fuel is established to be in the brittle state in the volume of uranium-gadolinium fuel pellet containing a burnable neutron absorber under irradiation and in the plastic state out of this volume. The relative change in a pellet volume for uranium-gadolinium fuel is shown to be lower than that for uranium oxide nuclear fuel with the same microstructure.
- ПубликацияОткрытый доступESTIMATES OF He+ SCATTERED FROM THE SURFACE SURVIVAL PROBABILITY USING BINARY COLLISIONS CODES(НИЯУ МИФИ, 2019) Mamedo, N. V.; Kurnaev, V. A.; Sinelnikov, D. N.; Mamedov, I. M.; Синельников, Дмитрий Николаевич; Мамедов, Никита ВадимовичLow-energy (1-20 keV) ion scattering spectroscopy is the widespread method of surface analysis [1,2]. The surface layer composition can be reconstructed from narrow peaks in the energy spectra of the scattered inert gas ions and recoil ions [3]. The main advantage of the surface analysis using inert gas ions is the high sensitivity to the first layer of surface atoms. This is due to the low initial energy of the ions (and therefore small ion penetration depth) and the high neutralization probability of the reflected ions, which increases with the penetration depth of the incident particle into the solid [3]. However, for quantitative surface analysis, it is extremely important to determine the neutralization probability (or the probability of ion survival), since this method usually detects reflected ions only.
- ПубликацияОткрытый доступИССЛЕДОВАНИЕ ПОВРЕЖДЕНИЙ В МОНОКРИСТАЛЛАХ Y3Fe5O12, ОБЛУЧЕННЫХ БЫСТРЫМИ ТЯЖЕЛЫМИ ИОНАМИ, МЕТОДОМ РАМАНОВСКОЙ СПЕКТРОСКОПИИ(НИЯУ МИФИ, 2019) Мутали, А. К.; Сайфулин, М. М.; Скуратов, В. А.; Янсе ван Вуурен, А.; О’Коннелл, Ж. Г.; Скуратов, Владимир АлексеевичThe Raman spectroscopy method was used to study the radiation damage formed along the path of swift heavy ions in a yttrium iron garnet (Y3Fe5O12, YIG). YIG single crystals have been irradiated with swift Xe and Bi ions with energies of 167 and 715 MeV, respectively. Irradiation was carried out at room temperature in the range of fluences from 1011 to 1013 ions /cm2. The results obtained in this work is compared with previously obtained direct data (transmission electron microscopy) and indirect methods (Rutherford backscattering spectroscopy, X-ray diffraction).
- ПубликацияОткрытый доступHELIUM THERMAL DESORPTION FROM TUNGSTEN AFTER ION BEAM IRRADIATION AT ELEVATED TEMPERATURES(НИЯУ МИФИ, 2019) Ryabtsev, S. A.; Gasparyan, Yu. M.; Harutyunyan, Z. R.; Efimov, V. S.; Aksenova, A. S.; Pisarev, A. A.; Писарев, Александр Александрович; Ефимов, Виталий Сергеевич; Гаспарян, Юрий Микаэлович; Арутюнян, Зорий РобертовичHelium (He) is a product of deuterium-tritium reaction, so appearance of helium impurities will be unavoidable. In addition to He implantation from fusion plasma, He can be introduced into material by both neutron irradiation and tritium radioactive decay. Presence of He in plasma-facing materials may significantly influence their mechanical properties and surface morphology [1, 2], as well as hydrogen isotope recycling [3, 4]. Tungsten (W) will be used as a plasma-facing material in ITER divertor [5], and it is considered also for application in future fusion devices. Therefore, investigation of He interaction with W is of great interest.
- ПубликацияОткрытый доступMODELING OF CO-DEPOSITION OF HYDROGEN WITH SPUTTERED METALS(НИЯУ МИФИ, 2019) Krat, S.; Gasparyan, Yu.; Vasina, Ya.; Prishvytsin, A.; Pisarev, A.; Крат, Степан Андреевич; Гаспарян, Юрий МикаэловичHydrogen accumulation in fusion devices is a serious issue from the viewpoint of radiation safety, as the total amount of radioactive tritium is strictly controlled. It also affects plasma parameters, as hydrogen accumulated in the device can be released during the discharge due to the plasma-wall interaction. One of the main channels for hydrogen accumulation is co-deposition, wherein hydrogen is deposited onto a surface together with particles of the wall material previously eroded from some other area of the fusion device’s wall by plasma. Such co-deposition can lead to accumulation of thick layers of material containing large amounts of hydrogen in hard to reach areas of the installations, such as pump lines or shadowed areas of the divertor in tokamak devices. The hydrogen content in such codeposited layers can reach tens of atomic percent, and, in the case of hydrogen active materials, such as carbon, even exceed unity. Hydrogen content in such films depends strongly on a number of co-deposition parameters, such as the deposition rate, temperature of the surface on which co-deposition occurs, hydrogen flux to the surface during deposition and others. This makes purely empirical approach to prediction of hydrogen accumulation in codeposited layers in fusion devices very difficult requiring exhaustive experimental testing in the full range of parameters that can occur in fusion devices. Such approach is not always feasible or economically viable, especially when attempting to predict hydrogen accumulation in future devices. Because of this, an approach is preferable that could provide quantitative predictions via computationally cheap predictive modeling of plasma-wall interactions.
- ПубликацияОткрытый доступМЕТОДИКА ФОРМИРОВАНИЯ СВЕРХГЛАДКИХ ПОВЕРХНОСТЕЙ СИТАЛЛА ИОННО-КЛАСТЕРНЫМИ И АТОМАРНЫМИ ПУЧКАМИ АРГОНА(НИЯУ МИФИ, 2019) Бакун, А. Д.; Гусев, А. С.; Каргин, Н. И.; Рындя, С. М.; Сигловая, Н. В.; Бакун, Алексей Дмитриевич; Каргин, Николай Иванович; Гусев, Александр Сергеевич; Рындя, Сергей Михайлович; Сигловая, Наталия ВладимировнаOptical glass ceramics (ex. sitall) is a promising material for the elements of devices operating in a wide temperature range. However, typical methods do not allow to form a substrate with a mean-square surface roughness of less than 0.2 nm in the spatial frequency range corresponding to the scattering of incident optical radiation. To obtain super-smooth substrates of optical glass ceramics it is proposed to use the method of gas cluster ion beam (GCIB) and accelerated neutral atom beam (ANAB) processing.
- ПубликацияОткрытый доступAPPLICATION OF KEV-ENERGY PROTON SCATTERING FOR SURFACE ANALYSIS(НИЯУ МИФИ, 2019) Bulgadaryan, D.; Sinelnikov, D.; Kurnaev, V.; Efimov, N.; Ефимов, Никита Евгеньевич; Синельников, Дмитрий НиколаевичLow- and medium-energy ion scattering (LEIS/MEIS) are widely used techniques of surface analysis [1–4]. Conventional LEIS/MEIS setups utilize noble gas ions and electrostatic energy analyzers that makes these methods very sensitive to composition of the uppermost atomic layers of an analyzed sample. However, high neutralization probability of noble gas ions restricts LEIS/MEIS depth profiling capabilities [5]. The use of hydrogen ions with lower neutralization probability instead of noble gas provides possibility to measure the thickness of surface layer if its atomic mass is very different from that of underlying target, that is the case e.g. in nanoelectronics [6] or for redeposition of plasma-facing materials in fusion devices [7]. In this work we present simulated and experimental data on implementation of keV-energy proton scattering (KEPS) for surface analysis.