Перегляд за автором "Kovtun, Yu.V."

Сортувати за: Порядок: Результатів:

  • An application of microwaves refraction for inhomogeneous plasma diagnostic 
    Siusko, Y.V.; Kovtun, Yu.V. (Вопросы атомной науки и техники, 2021)
    A brief review of the main microwave diagnostics methods of inhomogeneous plasma based on the refraction of microwaves is given. These methods make it possible to determine the plasma density distribution, the magnetic ...
  • Calculations for parameters of a stationary reflex discharge 
    Kovtun, Yu.V.; Ozerov, A.N.; Skibenko, A.I.; Skibenko, E.I.; Yuferov, V.B. (Вопросы атомной науки и техники, 2015)
    A variant of the stationary reflex discharge model based on the global (volume-averaged) model is under consideration. The calculation is carried out on the plasma electron density and temperature as a function of the ...
  • CIV fenomen in gas-metal plasma 
    Kovtun, Yu.V. (Вопросы атомной науки и техники, 2015)
    The paper deals with limitation of the rotational velocity of multicomponent gas-metal plasma, and also, with the effect of this phenomenon on mass separation in the rotating plasma. The measured data on the rotational ...
  • Comparative analysis of the refraction of microwaves at different frequencies in an inhomogeneous plasma of a high power impulse reflex discharge 
    Kovtun, Yu.V.; Siusko, Y.V.; Skibenko, E.I. (Вопросы атомной науки и техники, 2018)
    The trajectories of microwave rays at 36 and 71 GHz frequencies are calculated. A time dependences of an amplitude of scattered microwave signals at 36 and 71 GHz frequencies are experimentally measured. A comparison and ...
  • Design and application of glow discharge cleaning at Uragan-2M stellarator 
    Kovtun, Yu.V.; Moiseenko, V.E.; Maznichenko, S.M.; Lozin, A.V.; Korovin, V.B.; Kramskoy, E.D.; Siusko, Y.V.; Kozulya, M.M.; Krasiuk, A.Yu.; Listopad, V.M.; Baron, D.I. (Вопросы атомной науки и техники, 2021)
    For the Uragan-2M stellarator, a glow discharge cleaning (GDC) system is developed. An overview of the GDC system design is presented. The first experimental studies of GDC in an argon atmosphere have been carried out. The ...
  • Determining the rotational velocity of gas-metal multicomponent plasma in a reflex discharge 
    Kovtun, Yu.V.; Skibenko, A.I.; Skibenko, E.I.; Larin, Yu.V.; Yuferov, V.B. (2010)
    For the first time the rotational velocity of plasma layers with np = ncr^1,2 in the gas-metal plasma medium of the reflex discharge was determined using the two-frequency microwave fluctuation reflectometry. The measurement ...
  • Features of dense plasma formation in the reflex discharge on gas-metal mixes 
    Kovtun, Yu.V. (Вопросы атомной науки и техники, 2013)
    The paper briefly summarizes the data from studies of multicomponent gas-metal plasma in a pulsed reflex discharge. The processes of injection of sputtered-and-ionized working materials (Ti, Mo, W, U) into the reflex ...
  • Fusion research in stellarator department of IPP NSC KIPT 
    Moiseenko, V.Е.; Dreval, M.B.; Kovtun, Yu.V.; Kulyk, Yu.S.; Glazunov, G.P.; Kazakov, Ye.O.; Ongena, J.; Sharapov, S.E.; Thomsen, H.; Garkusha, I.E. (Problems of Atomic Science and Technology, 2022)
    This paper briefly describes intrinsic and collaborative scientific activities in the Stellarator Department of the Institute of Plasma Physics of the National Science Center “Kharkov Institute of Physics and Technology” ...
  • Investigation of gas discharge burn conditions in a Penning geometry in gradient magnetic fields 
    Ozerov, A.N.; Kovtun, Yu.V.; Skibenko, E.I.; Yuferov, V.B. (Вопросы атомной науки и техники, 2017)
    Conditions of gas discharge burn in a Penning geometry the gradient magnetic field have been investigated. The values of the ignition voltage and volt-ampere characteristics of the gas discharge depending on the working ...
  • Investigation of the influence of Ar pressure on vacuum-arc plasma with Cr-, Cu-, and Zr-cathodes 
    Kovtun, Yu.V.; Kuprin, A.S.; Lunev, V.M. (Вопросы атомной науки и техники, 2019)
    The work deals with the influence of argon pressure on the ion current of vacuum-arc discharge in the “Bulat-6” setup with Cr-Cu-Zr-cathodes, and also, on the rate of coating deposition on the surfaces being perpendicular ...
  • Investigation on the possibility of determining plasma parameters by the method of low-frequency diagnostics 
    Kovtun, Yu.V.; Pinos, I.B.; Skibenko, A.I.; Skibenko, E.I. (Вопросы атомной науки и техники, 2014)
    A possibility of determining some parameters (density, collision rate, magnetic field strength, mass-and-ion charge) of the plasma being in a magnetic field is under consideration. Peculiarities in the change of probing ...
  • Investigations on the parameters of multicomponent gas-metal plasma formed in the mixed molecular gases 
    Kovtun, Yu.V.; Syus'ko, E.V.; Skibenko, E.I.; Skibenko, A.I.; Shapoval, A.N; Yuferov, V.B. (Вопросы атомной науки и техники, 2017)
    Studies have been made into the parameters of dense, multicomponent gas-metal plasma formed in the operating medium consisting of molecular gases such as nitrogen and oxygen, and also, the component metal Ti. Charge and ...
  • Magneto-plasma separation as a method for reprocessing of spent fuel and radioactive waste 
    Yegorov, A.M.; Skibenko, E.I.; Kovtun, Yu.V.; Yuferov, V.B. (Вопросы атомной науки и техники, 2008)
    A variant of a separating device based on the plasma-beam discharge is considered, including: processes of radioactive material (SF and RAW) ionization; evaluation of the mass-production capacity of the device with taking ...
  • Measurement of the plasma density in two modes of pulsed discharge burning in the penning cell 
    Kovtun, Yu.V.; Skibenko, A.I.; Skibenko, E.I.; Yuferov, V.B. (Вопросы атомной науки и техники, 2015)
    The paper presents the experimental evidence of two modes of pulsed discharge burning in the Penning cell. The modes have different values of maximally reached plasma density and its dynamics change.
  • Non resonant microwave D ischarge start up in Heliotron J 
    Kovtun, Yu.V.; Nagasaki, K.; Kobayashi, S.; Minami, T.; Kado, S.; Ohshima, S.; Nakamura, Y.; Ishizawa, A.; Konoshima, S.; Mizuuchi, T.; Okada, H.; Laqua, H.; Stange, T. (Problems of Atomic Science and Technology, 2023)
    The non-resonant microwave discharge in strong magnetic fields was investigated in Heliotron J under the condition, ωce ⁄ωMW >1 (ωce and ωMW are the angular electron cyclotron frequency and the angular microwave frequency, ...
  • Propagation of multicomponent plasma oscillations along the magnetic field in the pulsed reflex discharge 
    Kovtun, Yu.V.; Skibenko, A.I.; Skibenko, E.I.; Pinos, I.B.; Larin, Yu.V.; Yuferov, V.B. (Вопросы атомной науки и техники, 2012)
    The angular velocity of equal-density plasma layer rotations along the magnetic field has been measured. The values obtained in different points are similar that is in accordance with the isorotation law. It has been ...
  • Radiation of multicomponent gas-metal plasma of a pulsed reflex discharge 
    Kovtun, Yu.V.; Skibenko, A.I.; Skibenko, E.I.; Larin, Yu.V.; Shapoval, A.N.; Yuferov, V.B. (2010)
    Measurements on the radiation flux of gas-metal plasma formed in the medium of igniting gas (gas mixture) and sputtered cathode material in the pulsed reflex discharge were carried out. A spectrometric method was applied ...
  • Refraction of microwaves in an inhomogeneous rotating plasma 
    Kovtun, Yu.V.; Syus'ko, E.V.; Skibenko, E.I.; Skibenko, A.I. (Вопросы атомной науки и техники, 2016)
    The calculations of the angle of microwave ray deviation φ as a function of the angle of the ray incidence ψ on inhomogeneous plasma have shown that a part of the microwave rays may arrive at the horn antenna installed ...
  • Status and prospects in stellarator research at IPP KIPT 
    Moiseenko, V.E.; Kovtun, Yu.V.; Garkusha, I.E. (Вопросы атомной науки и техники, 2021)
    A review of works performed at the Stellarator Department of KIPT is presented. It includes radio frequency (RF) plasma start-up, RF wall conditioning, RF plasma heating and diagnostics improvements at Uragan stellarators, ...
  • Two-strap RF antenna in Uragan-2M stellarator 
    Lozin, A.V.; Kovtun, Yu.V.; Moiseenko, V.E.; Maznichenko, S.M.; Kozulia, M.M.; Korovin, V.B.; Shapoval, A.N.; Kramskoy, E.D.; Pavlichenko, R.O.; Zamanov, N.V.; Makhov, M.M.; Krasyuk, A.Yu.; Siusko, Y.V.; Tymoshenko, A.I.; Listopad, V.M.; Wauters, T.; Kazakov, Ye.; Ongena, J. (Вопросы атомной науки и техники, 2020)
    A unshielded two-strap antenna had been installed in Uragan-2M. A vacuum chamber inner walls conditioning regime with the two-strap antenna is studied in a weak magnetic field. Plasma with the density nₑ~ (0.2…0.95)·10¹²сm⁻³ ...