Search academic texts

Information × Registration Number 0217U001459, 0115U004252 , R & D reports Title Investigation of mechanisms of plasma generation, transportation and wave processes in electric discharge plasma in metal vapors, gas and condensed media popup.stage_title Head Fedorovych Oleg Antonovych, Кандидат фізико-математичних наук Registration Date 15-02-2017 Organization Institute For Nuclear Research Of National Academy Of Sciences Of Ukraine popup.description2 The paper presents the results of experimental studies RF helicon and RF capacitive discharge in inert and reactive gas by probe, mass - spectrometric methods, and results of development of theoretical models of plasma accelerator with closed electron drift and open gas walls. The report consists of three sections. In the first section of the report shows the results of the work on RF helicon discharge, which is made for the main theme of the department of plasma physics and plasma technologies for 2015 - 2020 years and, in part, the results of the project "Development and research of plasma sources of a new type for uniform treatment of surfaces in helicon discharge with linear exciting system". The given project is a part of the Scientific Council of the Presidium of the National Academy of Sciences of Ukraine "Prospective study of plasma physics, controlled nuclear fusion and plasma technologies" (contract number PL 16/16 (2016)). Modernization of helicon discharge installation is made and a new type of antenna developed. The distribution of the ion current, which comes on the leading surface from helicon discharge plasma, which excited by linear antenna with increased length (40 cm) were obtained. It was found that in those regimes when realized uniform current distribution (plasma concentration), the length of homogeneous areas is also increasing and is determined by the length of the antenna, excluding the boundary regions whose length approximately equal to the distance from the antenna to the treated surface. Uniform distribution of the ion current was obtained for a uniform field between the antenna and the treated surface. For the linear discharge it was not detected the positive influence of nonuniform field, which increased with distance from the antenna. When using permanent magnets located under the work surface, uniform concentration profile can be obtained using the additional electromagnetic coil in the antenna area. Stable linear discharge in methane with a uniform concentrations distribution along the antenna was achieved using 10% impurities of argon. The second section shows the results of mass spectrometry research in plasma-chemical reactor with capacitive excitation of the plasma generated in the RF discharge in crossed electric and controlled magnetic fields. Depending on the oxygen content in the plasma-chemical reactor the intensity of the gas reaction primary products decrease indicates the increase of quantity of oxidation reactions. Mass spectrometry study of freons showed the presence of carbonyl radicals that are responsible for the formation of fluoroplastic film on the materials surface and their decrease in by increasing the oxygen plasma discharge. As a part of the plasma of freon - contain gas which includes the carbon it was found toxic to human health substances. The third section is devoted to creation of the theoretical models of plasma accelerator with closed electron drift and opens gas walls. The analytical and numerical results for hydrodynamic model were obtained. The first results for the hybrid model were also obtained. First introduced and detailed model of the accelerator with closed electron drift and open walls, which unlimited metal or dielectric. Based on the idea of complete continuity of the current flowing in the system, the exact analytical solutions that describe the distribution of electric potential in accelerating space were obtained. These solutions were obtained in the case of zero temperature electrons, and in the case of finite temperatures, the obtained by warming of magnetized electrons in a transverse electric field. It was established for weak current mode that condition of fully applied voltage drop in the accelerating interval corresponds to the geometric length equality to gap thickness of the anode layer in a boundary mode. For the strong current mode was obtained generalized condition of being self-discharge in crossed E ? H fields taking into account peculiarities dynamics of ionic and electronic components. The results of theoretical research are in good agreement with experimental data. Product Description popup.authors Бєлошенко Микита Анатолійович Білодуб Анатолій Макарович Борисенко Анатолій Григорович Вірко Валерій Федорович Вірко Юрій Валерійович Васильчук Богдан Ярославович Войтенко Леонід Михайлович Гладковський Володимир Володимирович Костін Євген Георгійович Літовко Ірина Валентинівна Лашкін Володимир Михайлович Павленко Віктор Миколайович Панченко Володимир Григорович Петряков Володимир Олексійович Подзірей Юрій Степанович Полозов Борис Павлович Порицький Павло Віталійович Рокицький Олександр Анатолійович Старчик Павло Денисович Толстих Михайло Юрійович popup.nrat_date 2020-04-02 Close