Конференции НИЯУ МИФИ

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Просмотр Конференции НИЯУ МИФИ по Автор "Bulgadaryan, D."

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    APPLICATION OF KEV-ENERGY PROTON SCATTERING FOR SURFACE ANALYSIS
    (НИЯУ МИФИ, 2019) Bulgadaryan, D.; Sinelnikov, D.; Kurnaev, V.; Efimov, N.; Ефимов, Никита Евгеньевич; Синельников, Дмитрий Николаевич
    Low- 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.
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    SCATTERING OF HYDROGEN ION BEAM FROM TUNGSTEN FUZZ
    (НИЯУ МИФИ, 2017) Sinelnikov, D.; Bulgadaryan, D.; Kurnaev, V.; Efimov, N.
    Tungsten is the main candidate for plasma facing material in the divertor zone of a thermonuclear reactor due to high melting temperature, high thermal conductivity and low sputtering erosion yield. However, its surface can be modified by "fuzz" nanostructure, which can form in linear simulators and tokamaks [1] under helium irradiation fluence as high as ~1025m-2, sample temperature in the range of 1000-2000 K and energy >20 eV. Such structure significantly changes the plasma-wall interaction balance, especially the interaction of plasma components with the surface.