Персона: Пунтаков, Николай Алексеевич
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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Николай Алексеевич
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- ПубликацияТолько метаданныеMeasurement of the Characteristics of Fine-Grained Graphite Used as a Material for the First Wall of the T-15MD Tokamak(2023) Begrambekov, L. B.; Puntakov, N. A.; Airapetov, A. A.; Grunin, A. V.; Dovganyuk, S. S.; Zakharov, A. M.; Savvin, N. O.; Беграмбеков, Леон Богданович; Пунтаков, Николай Алексеевич; Айрапетов, Алексей Александрович; Довганюк, Сергей Сергеевич; Захаров, Андрей Михайлович; Саввин, Никита Олегович
- ПубликацияОткрытый доступBehaviour of Redeposited Tungsten Layers with Varying Impurity Content during Thermal and Radiation Loads(2019) Begrambekov, L. B.; Bidlevich, O. A.; Grunin, A. V.; Puntakov, N. A.; Voityuk, A. N.; Беграмбеков, Леон Богданович; Пунтаков, Николай Алексеевич© Published under licence by IOP Publishing Ltd.Tungsten is going to be implemented as a material for plasma-facing divertor tiles in an ITER tokamak. Accumulation of dust particles due to exfoliation of redeposited tungsten layers can severely affect the operation of a fusion devices. Behaviour of tungsten films deposited on tungsten, including layers with added impurities of iron (0,2 at.% and 2 at.% concentration), as well as dust particles with Al impurity, has been studied. It is shown that a film with 2 at.% impurity of iron exhibits exfoliation and blistering when exposed to thermal and radiation loads, while tungsten dust particles with aluminium impurity undergo various structural changes depending on their Al content when heated.
- ПубликацияОткрытый доступProperties of graphite to be used as a material for the T-15MD tokamak plasma-facing elements(2020) Grashin, S. A.; Arkhipov, I. I.; Puntakov, N. A.; Ayrapetov, A. A.; Begrambekov, L. B.; Grunin, A. V.; Dovganyuk, S. S.; Kaplevskiy, A. S.; Tenishev, A. V.; Пунтаков, Николай Алексеевич; Айрапетов, Алексей Александрович; Беграмбеков, Леон Богданович; Довганюк, Сергей Сергеевич; Тенишев, Андрей Вадимович© Published under licence by IOP Publishing Ltd.The results of the measurement of physical properties, sputtering yield during irradiation by hydrogen ions and a study of surface morphology modification of graphite to be used for the plasma-facing materials of the T-15MD tokamak are presented in this work.
- ПубликацияОткрытый доступDependence of the erosion of graphite on flux density for high-temperature irradiation by hydrogen ions(2019) Puntakov, N. A.; Begrambekov, L. B.; Grunin, A. V.; Dolganov, G. D.; Пунтаков, Николай Алексеевич; Беграмбеков, Леон Богданович; Долганов, Григорий Дмитриевич© 2019 IOP Publishing Ltd. All rights reserved.In this paper, a dependence of the erosion of graphite under a high energy ion flux at temperature of 2050°C on the ion dose is investigated. It is shown that, at ion flux densitiy of 1.42×1022 ion/m2s, irradiation stimulates diffusion processes that lead to the removal of carbon atoms from the bulk of the sample, leading to the formation of a porous layer, whereas, for ion flux density of 1.4×1020 ion/m2s, no such layer is formed.
- ПубликацияОткрытый доступTemperature dependence of erosion of graphite under high-temperature ion irradiation(2019) Begrambekov, L. B.; Grunin, A. V.; Dolganov, G. D.; Puntakov, N. A.; Titkova, K. M.; Беграмбеков, Леон Богданович; Долганов, Григорий Дмитриевич; Пунтаков, Николай Алексеевич© Published under licence by IOP Publishing Ltd.In this paper, a dependence of the erosion of graphite under a high energy ion flux from the ion dose is investigated at temperatures of 750, 1700 and 2050 °C. High doses of irradiation stimulate diffusion processes that lead to the transport of carbon atoms from the bulk of the sample towards the surface, leading to the formation of a porous layer which thickness increases both with the increase of sample's temperature, as well as the dose of irradiation.
- ПубликацияОткрытый доступCharacteristics of the modification of the near-surface layer and sputtering of graphite under high intensity ion irradiation(2020) Puntakov, N. A.; Begrambekov, L. B.; Grunin, A. V.; Пунтаков, Николай Алексеевич; Беграмбеков, Леон Богданович© Published under licence by IOP Publishing Ltd.In this paper, features of the modification of near-surface layer of R6510P100D01 grade graphite under irradiation by deuterium and helium ions at a temperature of 2050 °C is investigated. It is shown that irradiation by such ions at a flux density of 1,4×1018 ion/cm2s initiates vacancy transport from the irradiated surface to the bulk of the sample, leading to the formation of a porous layer inside the sample with a thickness of over 2 mm. High sputtering yields, exceeding those for irradiation by the same ions at room temperature with a moderate intensity ion fluxes, lead to the conclusion that in these conditions, sublimation is the main mechanism of the removal of carbon atoms from the surface of graphite.