Персона: Писарев, Александр Александрович
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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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Александр Александрович
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- ПубликацияТолько метаданныеA setup for study of co-deposited films(2020) Krat, S. A.; Popkov, A. S.; Gasparyan, Y. M.; Vasina, Y. A.; Prishvitsyn, A. S.; Pisarev, A. A.; Крат, Степан Андреевич; Гаспарян, Юрий Микаэлович; Пришвицын, Александр Сергеевич; Писарев, Александр Александрович© 2020 IOP Publishing Ltd and Sissa Medialab.A setup for investigation of thermal desorption spectra of gases accumulated in thin films deposited by plasma sputtering of solid targets is described. Deposition and thermal desorption spectroscopy (TDS) are performed in two different vacuum chambers separated by a gate valve with the sample transferred between the chambers in-vacuo. The temperature of the substrate for deposited films can be varied in the range of 300-800 K; and the deposition rate is controlled by a quartz microbalance. Thermal desorption of co-deposited gases is analyzed by a quadrupole mass spectrometer. Sputtering rate and evaporation of the film during TDS are measured by quartz microbalances. Three experiments are described 1) trapping of deuterium by the growing chemically active Li film with subsequent decomposition and evaporation of the film, 2) temperature dependent deuterium trapping in the growing W film resulting in trapping with several binding energies, and 3) chemical interaction of D-Li layer with water vapor leading to isotopic H-D exchange and chemical transformation of the deposited film.
- ПубликацияТолько метаданныеSubstitution of heavy hydrogen isotopes in tungsten layers during gas exposure ЗАМЕЩЕНИЕ ТЯЖЕЛЫХ ИЗОТОПОВ ВОДОРОДА В ВОЛЬФРАМОВЫХ СЛОЯХ ПРИ ВЫДЕРЖКЕ В ГАЗЕ(2020) Krat, S. A.; Vasina, Ya. A.; Prishvitcyn, A. S.; Fefelova, E. A.; Popova, M. A.; Gasparyan, Yu. M.; Pisarev, A. A.; Крат, Степан Андреевич; Пришвицын, Александр Сергеевич; Гаспарян, Юрий Микаэлович; Писарев, Александр Александрович© 2020 National Research Center Kurchatov Institute. All rights reserved.Efficiency of deuterium removal from tungsten co-deposited layers was studied by means of thermal desorption spectroscopy in the 30 to 200 °С temperature range in vacuum and hydrogen atmosphere (8 104 Pa). Tungsten layers 100 nm and 500 nm thick were deposited in magnetron discharge in argon-deuterium environment and contained ~2% at. of deuterium. Presence of hydrogen (protium) during sample degassing increases the rate of deuterium removal. Simultaneously, an additional amount of protium is captured in the co-deposited layers. The rate of deuterium removal increases with temperature. Exposure at a temperature of 473 K in a hydrogen atmosphere for 18 hours allowed 99% of the captured deuterium to be removed.
- ПубликацияТолько метаданныеAccumulation of Deuterium and Helium in Co-Deposited W Layers Formed in He-Seeded Deuterium Plasma(2022) Krat, S. A.; Fefelova, E. A.; Prishvitcyn, A. S.; Khomyakov, A. K.; Gasparyan, Y. M.; Pisarev, A. A.; Крат, Степан Андреевич; Пришвицын, Александр Сергеевич; Гаспарян, Юрий Микаэлович; Писарев, Александр Александрович© 2022, Allerton Press, Inc.Abstract: The effect He in plasma has on the co-deposition of D–W films is investigated for the room–800 K range of substrate temperatures and two He/D2 ratios of 5 and 20%. He can both raise and lower the content of D in a film, and a mechanism is proposed for this effect. The ratio of He/D in the film is higher than in gas, due to the stronger diffusivity and bonding energy of He. A similarity is observed between the dependences of D and He content on temperature, and it is suggested that the low temperature release of D and He during TDS could be due to annealing-induced relaxation of stresses in the film structure. It is expected that the desorption of He above 1300 K could lead to underestimates of the He content.
- ПубликацияТолько метаданныеLithium-deuterium co-deposition(2023) Krat, S. A.; Popkov, A. S.; Vasina, Y. A.; Gasparyan, Y. M.; Pisarev, A. A.; Крат, Степан Андреевич; Гаспарян, Юрий Микаэлович; Писарев, Александр Александрович