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Information × Registration Number 0225U003266, (0124U004242) , R & D reports Title Key aspects of the interaction of plasma with surfaces in the development of thermonuclear energy popup.stage_title Модернізація числового коду для отримання можливостей моделювання ВЧ розрядів у малих магнітних полях. Дослідження очищуючих плазмових розрядів. Підготовка пропозицій для цільових експериментів на великих стелараторах (W7-X і LHD) Head Harkusha Ihor Ye., Доктор фізико-математичних наук Registration Date 10-06-2025 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 numerical code for modeling RF discharges in small magnetic fields has been modernized. This code uses a new form of Maxwell's harmonic equations. The model domain is a rectangular parallelepiped. The three-dimensional method of lowest-order finite differences is used for discretization. The chosen antenna model is a divergence-free electric current directed in the y direction. The convergence analysis for the code showed the same convergence rate as in the case without plasma. Numerical calculations of the parameters of the glow discharge plasma based on a globally averaged model were performed. Calculations were performed for argon. Iron, the main component of stainless steel, was taken as the cathode material. The dependences of the electron temperature and density, the density of sputtered iron atoms and iron ions, and the density of metastable argon atoms on the pressure and adsorbed power in the discharge were calculated. Experiments with a spark discharge for cleaning vacuum surfaces were conducted on the Uragan-2M stellarator. The experiments were conducted in the range of discharge currents from 0.025 to 1 A and working gas pressures of argon from 0.27 to 13.1 Pa. It was found that the measured current-voltage characteristics are similar to the hollow cathode discharge. The radial profile of the plasma density and electron temperature was measured using a moving triple probe. The mass spectrometric diagnostic complex on the Uragan-2M stellarator has been modernized. Two scenarios of vacuum surface cleaning using high-frequency (HF) discharge plasma in an argon atmosphere under a low magnetic field were investigated on the Uragan-2 M stellarator. Measurements showed a decrease in the partial pressure of water by ~ 50-51% after the vacuum surface cleaning procedure. The data of joint experiments on plasma creation using high-frequency discharges in the frequency range of an ion cyclotron, which were carried out on the Uragan-2M, LHD and W7-X stellarators Product Description popup.authors Volkova Yuliia Ye. Herashchenko Stanislav S. DREVALʹ Mykola B. Kovtun Yurii V. Kulyk Yuliia S. Maznichenko Serhii M. MARTSENIUK Yurii P. Makhlai Vadym O. Pavlichenko Rostyslav O. popup.nrat_date 2025-06-10 Close