2017_Взаимодействие ионов с поверхностью (ВИП)
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- ПубликацияОткрытый доступCORRELATION OF DEUTERIUM RETENTION WITH CRYSTALLINE STRUCTURE IN DENSE AND DISORDERED TUNGSTEN COATINGS(НИЯУ МИФИ, 2017) Ogorodnikova, O. V.; Ruset, C.; Dellasega, D.; Pezzoli, A.; Passoni, M.; Sugiyama, K.; Gasparyan, Yu.; Efimov, V.; Ефимов, Виталий Сергеевич; Гаспарян, Юрий Микаэлович; Огородникова, Ольга ВячеславовнаDense nano-structured tungsten (W) coatings are used as plasma-facing materials in current tokamaks and thick coatings are suggested to be used also for the future fusion devices, ITER and DEMO. In this study, deuterium (D) retention in various W coatings was investigated to understand dependences of the D retention on the crystalline structure of each W coating and on the substrate material.
- ПубликацияОткрытый доступANALYTICAL EXPRESSION FOR THE SHEATH ELECTRIC FIELD FOR SPUTTERING MODELLING AT JET ILW EXPERIMENTS(НИЯУ МИФИ, 2017) Borodkina, I.; Borodin, D.; Brezinsek, S.; Tsvetkov, I. V.; Kurnaev, V. A.; Klepper, C. C.; Lasa, A.; Guillemaut, C.; Jacquet, P.; Stamp, M. F.; Giroud, C.The study of plasma–surface interaction processes is important for a successful realization of the international ITER project. The JET ITER-like wall (ILW) [1] comprises a tungsten (W) divertor and beryllium (Be) main chamber wall thus matching the material configuration planned for ITER. Estimating plasma facing component (PFC) sputtering by plasma ions is an important issue for ITER as erosion determines the life time of PFC, impacts on the tritium retention by co-deposition with Be and leads to an increase of impurities in core plasma and the consequent reduction in fusion plasma performance. For correct calculation of the sputtering yields for PFCs the accurate expression for the sheath electric field must be included. This work represents the review of our previous works devoting to the development of analytical expressions for the sheath electric field taking into account the presence of an oblique magnetic field, secondary electron-electron emission and surface biasing.
- ПубликацияОткрытый доступPULSED ABNORMAL GLOW DISCHARGE WITH HOLLOW CATHODE FOR NITRIDING OF INTERNAL CYLINDRICAL SURFACES(НИЯУ МИФИ, 2017) Borisyuk, Yu. V.; Kozlova, V. V.; Mozgrin, D. V.; Oreshnikova, N. M.; Stepanova, T. V.; Pisarev, A. A.; Писарев, Александр АлександровичPlasma nitriding is a method of thermochemical treatment, which is widely used to enhance surface hardness, fatigue strength, and corrosion resistance of steels [1,2]. In industry, glow discharge is commonly used for this purpose. A specific task of plasma technologies is treating of cavities, which are usually inaccessible for plasma. Still, the need to modify cavities and tubes of small diameters and large aspect ratios exists. Abnormal glow discharge with hollow cathode in the pulse-periodic mode was proposed for this purpose in [3]. This work is devoted to investigation of ignition and properties of the abnormal glow discharge in tubes and demonstration of nitriding of internal surfaces of the tubes.
- ПубликацияОткрытый доступОБРАЗОВАНИЕ СПЛОШНЫХ ГИДРИДОВ В ОБОЛОЧКЕ ТВЭЛ(НИЯУ МИФИ, 2017) Девятко, Ю. Н.; Новиков, В. В.; Хомяков, О. В.; Хомяков, Олег ВладимировичFormation mechanism of massive hydrides in irradiated zirconium cladding is established. It is shown that the duration of formation process is defined by a period of time up to destruction of oxide film on the internal surface of fuel cladding. The time required for massive hydride to grow through the thickness of zirconium cladding is established.
- ПубликацияОткрытый доступУДАЛЕНИЕ ДЕЙТЕРИЯ, ВНЕДРЁННОГО В ГРАФИТ, ПРИ ПОСЛЕДУЮЩЕМ ОБЛУЧЕНИИ ИОНАМИ ВОДОРОДНОЙ ПЛАЗМЫ(НИЯУ МИФИ, 2017) Айрапетов, А. А.; Беграмбеков, Л. Б.; Довганюк, С. С.; Каплевский, А. С.; Айрапетов, Алексей Александрович; Довганюк, Сергей Сергеевич; Беграмбеков, Леон БогдановичThe paper investigates peculiarities of deuterium removal implanted into graphite by subsequent irradiation with hydrogen plasma ions. It is shown that irradiation with 50-eV hydrogen ions leads to desorption of deuterium previously implanted with energies 100 and 650 eV. The fraction of deuterium remaining in graphite decreases with the increase of hydrogen irradiation dose. The amount of deuterium in graphite stays constant after multiple cycles of consequent irradiation. Conclusion is made that low energy irradiation with hydrogen ions can be used as a method of low temperature graphite degassing.