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Стёпин, Евгений Викторович

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Институт лазерных и плазменных технологий
Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.
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Руководитель научной группы "Плазменные двигатели в космических исследованиях"
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Стёпин
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Евгений Викторович
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2019 - 20202
2
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Автор: Stepin, E. V. × Имеет файлы: Yes ×

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  • Уменьшенное изображение
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    Plasma equilibrium and stability in a current-carrying conductor vicinity
    (2020) Brushlinskii, K. V.; Stepin, E. V.; Брушлинский, Константин Владимирович; Стёпин, Евгений Викторович
    © Published under licence by IOP Publishing Ltd.Our paper is connected with a cycle of works on mathematical modeling of plasma confinement processes in the magnetic traps - Galateas. A magnetic field confining plasma is created in these traps by current-carrying conductors which are immersed in the plasma volume but not in contact with the hot dense plasma. The idealized models of strictly equilibrium configurations of infinitely conductive plasma in traps possessing symmetry are based on two-dimensional boundary value problems with the scalar Grad-Shafranov equation for the magnetic flux function. Magnetic traps have a perspective in the controlled thermonuclear fusion problem if plasma configurations in them are stable. In our former publications, a question about stability of the configurations around a straight conductor was raised and particularly solved. Here these studies are continued. An area of maximal pressure and a section of its decrease near the outer boundary are included into the considered vicinity. The main result is that the instabilities observed here can be weakened if the plasma pressure slowly decreases near the trap outer boundary.
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    On sub-Alfven MHD flows with acceleration in coaxial channels
    (2019) Stepin, E. V.; Стёпин, Евгений Викторович
    © 2019 IOP Publishing Ltd. All rights reserved.Magnetohydrodynamic (MHD) flows in coaxial channels of plasma accelerators with a longitudinal magnetic field are considered. Sub-Alfven MHD flows with acceleration transonic to the slow magnetosonic speed are studied. Sub-Alfven MHD flows are related to the case when the plasma flow velocity doesn't exceed the Alfven speed corresponding to the longitudinal field along the channel. A narrow coaxial nozzle channel with a constant lower bound is considered. The non-stationary and stationary mathematical MHD models are considered in the quasi-one-dimensional approximation. The corresponding MHD problems are solved numerically. Features of the relaxation process and characteristics of the transonic sub-Alfven flow type with acceleration in the channel are studied. The influence of the longitudinal magnetic field on the steady-state plasma flows are researched. The mechanism of energy transformations is described.