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Information × Registration Number 0225U001071, (0120U102509) , R & D reports Title Physical properties of the dense low-temperature plasma of high-frequency and arc discharges in one- and multicomponent working environments popup.stage_title Плазмодинаміка потоків плазми та заряджених частинок Head Fedorovych Oleh A., Кандидат фізико-математичних наук Registration Date 24-01-2025 Organization Institute of Nuclear Research of the National Academy of Sciences of Ukraine popup.description1 The purpose of the work is to obtain new fundamental knowledge in plasma physics and the physics of high-frequency and arc discharges that work in various working environments in a wide pressure range, the development of the physical and technical foundations of new plasma devices and plasma technologies for the needs of modern science and technology. popup.description2  Based on the kinetic theory of fluctuations, the process of transformation of a transverse electromagnetic wave into a longitudinal Langmuir wave is investigated, when plasma turbulence is caused by an upper hybrid pump wave. The latter decays into a daughter upper hybrid wave and ion-sound oscillations, ion-ion hybrid waves. In the subthreshold region of the parametric decay instability, an expression for the differential transformation cross section is obtained and it is shown that the dominant contribution to the cross section is made by a term that depends on the amplitude of the pump field. The dependence of the transformation coefficient on the parameters of the plasma and the pump wave is found. The influence of metal impurities on the electrical conductivity of dense plasma of pulsed discharges in water is considered. The calculations of electrical conductivity were based on the method of Grade moments. It is shown that a small amount of metal impurities can significantly change the value of the plasma conductivity coefficient compared to the case of pure water vapor. It is found that metal impurities can cause both an increase and a decrease in plasma conductivity, which is associated with the processes of interparticle collisions and the presence of clusters. A self-consistent system of equations is formulated to describe the sublimation/evaporation of microdroplets in an arc plasma flow with a high density (up to 1012 cm-3) of energetic electrons (up to 5 keV) injected by an electron gun. Using the example of a copper arc discharge, it was shown that microdroplets with radii ≤ 1 μm can reach temperatures up to 2700 K from heating by such a beam and even, under some conditions (plasma density 1012 cm-3 and beam 1011 cm-3), reach boiling temperature (2868 K), therefore both boiling and evaporation of droplets were considered. Product Description popup.authors popup.nrat_date 2025-01-24 Close