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Information × Registration Number 0224U033286, (0124U004242) , R & D reports Title Key aspects of the interaction of plasma with surfaces in the development of thermonuclear energy popup.stage_title Дослідження основних механізмів ерозії та радіаційних ушкоджень термоядерних матеріалів. Head Harkusha Ihor Ye., Доктор фізико-математичних наук Registration Date 24-12-2024 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 Experimental simulation studies of the main regularities of the interaction of high-power plasma with surfaces in controlled thermonuclear fusion installations and the development of effective methods of processing and cleaning the walls of the vacuum chamber of thermonuclear reactors. popup.description2 A 3D-printed tungsten Sn Capillary Porous Structure (CPS) sample was exposed to oblique high-power plasma in the QSPA facility. An energy density of ~ 3 MJ/m2 and a pulse duration of 0.25 ms in plasma streams are relevant to transient events in fusion reactor divertor. The experiment aimed to analyze the damage to a liquid metal prototype, a potential component of the divertor in fusion tokamaks. Observations of plasma-surface interactions revealed particle ejection from the exposed target, which depended on the energy density of the incoming plasma stream. The experiment showed that the plasma impacts with energy densities below 1.2 MJ m-2 caused only a small number of particles to eject from the target surface. With higher plasma loads, the number of ejected particles increased significantly. The particle ejection was predominantly observed from the leading edge of the CPS target. Similar behavior was noted in experiments involving oblique irradiation of castellated W target due to the formation of a non-uniform shielding layer over the target surface. The study revealed that both the average number of ejected particles and the mass loss rate during 30 inclined plasma exposures of Sn CPS were lower compared to those observed under normal irradiation. A reduction in mass loss rate of the plasma-treated sample over the course of the experimental series was demonstrated. The W substrate of the CPS target did not sustain significant damage. A comparative analysis of the damage to Sn-CPS and castellated W samples exposed to inclined and normal plasma streams under conditions simulating transients in a fusion reactor was also performed. Further experiments are required to analyze the damage of CPS prototypes filled with liquid metals under inclined high-cycle pulsed plasma loads.  Product Description popup.authors Volkova Yuliia Ye. Herashchenko Stanislav S. DREVAL Mykola B. Kovtun Yurii V. Kulyk Yuliia S. MAZNICHENKO Serhii M. MARTSENIUK Yurii P. Vadym O. Makhlai Pavlichenko Rostyslav O. popup.nrat_date 2024-12-24 Close