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Information × Registration Number 0221U101646, 0120U101223 , R & D reports Title Development of high-efficiency high-frequency plasma digits for cleaning and preparation of internal vacuum surfaces of the thermonuclear settings with magnetic maintenance of plasma and for creation of mishennoy plasma/ popup.stage_title Head Moiseenko Volodymyr Ye., Кандидат фізико-математичних наук Registration Date 23-01-2021 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description2 The results of numerical simulation of short-pulse discharge for electron-cyclotron plasma heating are presented. The analysis was performed using a self-consistent model that simulates high-frequency plasma generation in stelarator-type installations in the ion-cyclotron and electron-cyclotron frequency bands. The results of calculations for single pulses are presented. The purpose of these pulses is to create hydrogen atoms and their effect on cleaning the walls in the stellarator. Calculations show that the greatest formation of hydrogen occurs at the stage of plasma decay, when low electron temperature stimulates recombination. To ensure the continuity of atomic hydrogen generation, it is necessary to use a series of such pulses. The result of modeling such a mode is also presented. Numerical calculations have shown that this mode can serve as a basis for the scenario of cleaning the walls of the vacuum chamber W7-X. The possibility of using the previously developed multiprobe thermodesorption diagnostics system to study the processes of desorption of residual and plasma-forming gases after cleaning the walls of the Hurricane-2M (U-2M) stelarator chamber with plasma discharges in hydrogen, helium and argon was tested. It is shown that the sorption of hydrogen by stainless steel during cleaning of the chamber by discharges leads to its accumulation on the surface. Irradiation of stainless steel with RF plasma in the atmosphere does not significantly reduce the rate of hydrogen evolution. After cleaning the walls of the chamber U-2M glow discharge in argon, there is a noticeable desorption of argon from the surface of the probes, regardless of their position in the chamber and the material (stainless steel and stainless steel with TiN coating). Approbation of the multi-probe thermodesorption diagnostic system in the study of vacuum-plasma processes in the U-2M stelarator showed its rather wide possibilities. Product Description popup.authors BYRKA Volodymyr I. BYRKA Oleg V. BONDARENKO Vladislav M. Bondarenko Mykhaylo M. Garkusha Igor Ye. Garkusha Natalia M. GERASHENKO Stanislav S. GLAZUNOV Gennady P. DREVAL Mykola B. ZAMANOV Mykola V. Kovtun Yuri V. KRASYUK Oleksandr Y. Kulyk Mykola V. Kulyk Yuliya S. LYSTOPAD Viktor M. MAZNICHENKO Sergey M. Makhlai Vadym O. Moiseenko Volodymyr Yе. ROMANOV Vladislav S. Solodovchenko Sergey Iv. SOLYAKOV Dmytro G. SOROKOVYY Eduard L. SUSKO Evgeny V. TARASOV Igor K. popup.nrat_date 2021-01-23 Close