Персона:
Мартыненко, Юрий Владимирович

Организационные подразделения

Организационная единица

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.

Фамилия

Мартыненко

Имя

Юрий Владимирович

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Теперь показываю 1 - 9 из 9

Только метаданные
Plasma Railgun with Capillary–Porous Electrodes
(2021) Nagel', M. Y.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2021, Pleiades Publishing, Ltd.Abstract—: A scheme of a spacecraft thruster based on pulsed plasma railgun with capillary–porous electrodes is proposed. Electrodes of this kind are renewable and do not degrade while their lifetime is limited by the stored amount of the filler metal of the capillary–porous electrode. Operating regimes in which capillary–porous electrodes are efficient are found. In these regimes, the proposed railgun construction can yield the thrust of several newtons and specific impulse of several tens of km/s. Li, Sn, and Ga can be used as filler metals of capillary–porous electrodes with porous mats made from molybdenum or tungsten.
Только метаданные
Effect of Irradiation with Low-Energy Helium Ions on the Spectral Reflectance of Single-Crystal Molybdenum Mirrors
(2021) Rogov, A. V.; Kapustin, Y. V.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2021, Pleiades Publishing, Ltd.Abstract: A comparative study of the effect of irradiation with helium ions on the optical properties of single-crystal molybdenum mirrors with crystallographic orientations 〈110〉 and 〈111〉 is presented. The irradiation mode corresponds to the conditions in the built-in systems for plasma cleaning of the input mirrors from contamination in the optical diagnostics of the ITER international thermonuclear reactor using helium as a working gas. Such irradiation results in a variation in the specular reflection and diffuse scattering of the mirror that is virtually independent of the initial structure of the surface layer of the mirror and the duration of the irradiation process. The authors explain the changes of the optical characteristics of the mirror using the formation of nanosized bubbles in the surface skin layer. The Rayleigh scattering of incident radiation by the bubbles leads to a decrease in the intensity of specular reflection and an increase in the diffuse scattering. A model of the formation and growth of nanosized bubbles and their effect on optical properties is proposed. The results must be taken into account in the analysis of experimental data in the ITER optical diagnostics after removing of contaminants using helium, when choosing a working gas for plasma cleaning systems for mirrors, and also for the formation of a nanoporous structure in a thin surface layer of metals.
Только метаданные
The Use of Plasma and Ion Beam Technologies for the Production of Coatings on Pacemaker Electrodes
(2024) Obrezkov, O. I.; Bazylev, V. A.; Martynenko, Yu. V.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
Только метаданные
Surface Erosion of Metals under the Effect of Plasma Flows Typical of Transient Processes in Tokamaks
(2020) Martynenko, Y. V.; Мартыненко, Юрий Владимирович
It is shown theoretically that under the effect of plasma flows typical of transient processes in tokamaks not only can Kelvin-Helmholtz instability develop and waves arise on a molten metal surface, pulsating bumps of different sizes also can occur. The formation of bumpy surfaces should be expected at ITER. The maximum possible bump size has been determined. If a bump occurs with a size larger than the maximal one it will be displaced by plasma "wind," forming streams that flow to the periphery of the region exposed to the plasma flow. These streams transfer the molten metal over the surface. The sizes of bumps whose tops can be blown by the plasma wind, thus causing droplet erosion, were also determined.
Только метаданные
Structure Changes in Carbon Films Prepared by Electron-Beam-Assisted Deposition
(2019) Korshunov, S. N.; Lebedev, A. M.; Svechnikov, N. Y.; Skorlupkin, I. D.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2019, Pleiades Publishing, Ltd.Abstract: Carbon films 50–180 nm thick on nickel substrates are fabricated by the ion sputtering of graphite and the deposition of heavy hydrocarbons from the gas phase with simultaneous electron irradiation. Irradiation results in the formation of bonds in carbon films due to the sp and sp3 hybridization of orbitals (sp and sp3 bonds), mainly, sp3 bonds. A fraction of these bonds does not change with growth in the electron energy; it increases three-fold with a reduction in the temperature and an increase in the electron current density. Electron irradiation enhances the film microhardness which exceeds 12 GPa. The films, prepared by heavy hydrocarbon deposition, contain CHn bonds and a small fraction of sp3 bonds. The maximum value of the microhardness of the hydrocarbon films is no more than 4.5 GPa. The analysis of the proposed model of the kinetics of forming different allotropic phases in a carbon film to be deposited shows that a temperature reduction changes the specific volume of an atom in the lattice, while under conditions of simultaneous electron irradiation, it appreciably increases the content of the phase with sp3 bonds. The effect of spi-bond breakage during electron-beam-assisted deposition weakly depends on the electron energy. The weak excitations of electrons of carbon atoms can also result in the formation of sp3 bonds and increases their concentration with growth in the electron current density.
Только метаданные
Electrodynamic Plasma Thruster with Capillary-Porous Electrode
(2021) Nagel', M. Y.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2021, Pleiades Publishing, Ltd.Abstract: A scheme of a spacecraft thruster based on a stationary electrodynamic plasma accelerator with capillary-porous electrodes is proposed. Such electrodes are renewable and nondegradable, and the service life is limited by the supply of filler metal. High-efficiency regimes of the capillary-porous electrodes are determined. In such regimes, the accelerator can give a thrust of greater than 10 N and a specific impulse of several tens of kilometers per second. Li, Sn, and Ga with porous molybdenum or tungsten mats can be used as filler metal for capillary-porous electrodes.
Только метаданные
Molten Metal Transport along the Surface under the Effect of Plasma Flows Typical of Transient Processes in Tokamaks
(2021) Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2021, Pleiades Publishing, Ltd.Abstract: The metal surface erosion under powerful plasma pulse flows typical of transient processes in tokamaks, ELMs, and plasma disruptions and simulated on a quasistationary plasma accelerator (QSPA) is studied. The hillock relief formation on the molten metal surface over which the plasma flow parallel to the surface moves and also the formation of metal jets moving in the direction of the plasma flow are considered. On the basis of the motion of the jets, the molten metal transport along the surface and the erosion of this surface are explained.
Только метаданные
Assessment of the Functional Properties of Thin-Film Materials for Coating Cardiac Pacemaker Electrodes
(2022) Obrezkov, O. I.; Bazylev, V. A.; Nagel', M. Y.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2022, Springer Science+Business Media, LLC, part of Springer Nature.The electrochemical processes occurring on electrodes in cardiac pacemakers were considered. A method for calculating transient processes and the associated integral indicators of current delivery to cardiac tissue, i.e., impedance, residual polarization voltage, electrical capacity, and charge transfer efficiency, was proposed. Model experiments were performed to test coatings made of different materials. The study results can be used in designing up-to-date cardiac pacemaker systems.
Только метаданные
MHD Thruster with Capillary-Porous Electrodes
(2019) Ilgisonis, V. I.; Martynenko, Y. V.; Мартыненко, Юрий Владимирович
© 2019, Pleiades Publishing, Ltd. Abstract: Capillary-porous electrodes for plasma MHD devices are considered. The electrodes can be continuously renewable and allow one to use a scheme of the inverted MHD generator (i.e., MHD accelerator) as a thruster for interorbital flights. Two types of plasma acceleration are considered: (i) Lorentz force acceleration with a primary current perpendicular to the acceleration direction (Faraday scheme) and (ii) acceleration based on the Hall effect. In the first case, the thruster has advantages only at thrust powers exceeding 1 MW, while in the second case, the thrust and specific impulse are comparable with those of the known analogs (or even surpass them) already at powers of 500–1000 kW. The operating conditions of capillary-porous electrodes are formulated.