Properties of mixed Be+C layers on beryllium and hydrogen accumulation thereinстатья
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Дата последнего поиска статьи во внешних источниках: 9 июня 2015 г.
Авторы:
Guseva Mariya I.,
Danelyan Leon S.,
Gureev Viktor M.,
Kolbasov Boris N.,
Korshunov Sergej N.,
Kulikauskas Vatslavas S.,
Skorlupkin Igor D.,
Stolyarova Valentina G.,
Zatekin Vladimir V.
Аннотация:The presence of two different plasma contacting materials (Be and C) in the vacuum chamber of the International Thermonuclear Experimental Reactor (ITER) will result in the formation of mixed Be + C layers. Such layers were obtained experimentally by irradiating Be specimens with an acetylene plasma flux (with ∼300 eV molecular ion C 2 H + 2 energy and 1021 m−2s−1 intensity) from a plasma accelerator. Irradiation doses were 1023, 2⋅1023 and 1024 m−2. During the experiments, the temperature of a Be target surface was maintained at 670 K. The chemical composition of the mixed Be + C layers (except for the H content) was determined using Rutherford backscattering technique. Hydrogen distribution across the mixed layers was measured using the elastic recoil detection analysis. The surface microstructure and component composition of the mixed layers appeared to depend on the irradiation dose. The carbon content in the mixed layers grows with increasing dose. The Be/C atomic concentration ratio varies from 0.34 to 0.70 in mixed layers formed during irradiation by a 1023 m−2 dose. A mixed layer forming on Be surface exposed to a 1024 m−2 dose contains more carbon and has a spongy surface structure with Be/C atomic ratio as low as ∼0.04. Integral hydrogen concentration in the mixed Be + C layers decreases with growing irradiation dose. As the dose increases from 1023 to 1024 m−2, the H/(Be + C) atomic concentration ratio in the 1 μm thick layer decreases from 0.3 to 0.07.