Перегляд за автором "Girka, I.O."

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Azimuthal surface waves in low-density plasma loaded, coaxial helix traveling-wave-tube-like waveguides

Girka, I.O.; Thumm, M. (Вопросы атомной науки и техники, 2021)

The dispersion properties of flute electromagnetic waves propagating across an external axial static magnetic field in traveling-wave-tube-like waveguides with low-density plasma filling are investigated. The cylindrical ...
Azimuthal surface waves in toroidal magnetic traps

Girka, I.O.; Girka, O.I.; Girka, V.O.; Pavlenko, I.V. (Вопросы атомной науки и техники, 2008)

Extraordinary polarized electromagnetic surface waves are known to propagate with zero axial wave number (kz=0) along the small azimuth j nearby the interface of a cold uniform plasma located in cylindrical metal chambers ...
Change of radioactive waste characteristics at their processing and storage at nuclear power plants

Rudychev, V.G.; Girka, I.O.; Rudychev, Y.V.; Kaplij, A.A.; Shchus, O.P.; Sokoltsova, T.O. (Вопросы атомной науки и техники, 2015)

This paper offers some methods developed for calculation of radiation from the casks for storage of radioactive wastes (RW) at the nuclear power plant (NPP) area. Monte Carlo method was used to calculate spectral-angular ...
Combined calculation of radiation from large-sized ground RW storage facilities on the basis of Monte Carlo method

Rudychev, V.G.; Azarenkov, N.A.; Girka, I.O.; Rudychev, D.V.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2019)

A technique to reduce the dose rates, produced by large-sized ground-based radiation sources with dozens of radiating elements of the same geometry arranged along the perimeter, is developed. The radiating elements represent ...
Contribution of radionuclides to heat release in the process of SNF dry storage

Rudychev, V.G.; Azarenkov, M.O.; Girka, I.O.; Rudychev, Y.V.; Shchus, O.P. (Вопросы атомной науки и техники, 2017)

In the paper the radionuclide contribution to heat release at dry storage of spent nuclear fuel (SNF) of WWER-1000 was researched. β- and γ-radiation from 60 of the most active fission products, and α-radiation from 20 ...
Coupled HF azimuthal waves in magnetoactive waveguide partially filled by current-carrying plasma

Girka, O.I.; Girka, I.O.; Girka, V.O.; Pavlenko, I.V. (Вопросы атомной науки и техники, 2006)

Coupled surface extraordinarily polarized waves and bulk ordinarily polarized waves are proved to propagate along azimuthal direction in the cylindrical metal waveguide that is partially filled by cold magneto-active ...
Determination of chemical composition of implanted nanolayers by analysis of their optical properties

Mysiura, I.N.; Girka, I.O.; Gritsyna, V.T. (Functional Materials, 2012)

The method for determining the composition of nanolayer from the experimental spectra of optical transmission and reflection was developed. Modeling of the optical properties of the composite was carried out on the basis ...
Discretized collision operator for simulations of fusion non-maxwellian plasma relaxation

Shyshkin, O.A.; Vozniuk, D.V.; Girka, I.O. (Вопросы атомной науки и техники, 2018)

The plasma observed in modern fusion devices very often exhibits strongly non-Maxwellian distribution. This is the result of magnetic field lines reconnection with formation of magnetic resonant structures like magnetic islands ...
Do the dispersion properties of electromagnetic surface waves at the sharp boundary plasma-metal in slab Voigt geometry represent the limiting case of those for the interface of two plasmas?

Girka, I.O.; Thumm, M. (Problems of Atomic Science and Technology, 2023)

Electromagnetic surface waves in Voigt geometry are considered to resolve the contradiction between two clas-sical studies. One investigated the waves at the boundary of two plasmas. These waves were reported not to ...
Effect of the minority ions on the ICRF heating of fusion plasmas

Pavlenko, I.V.; Girka, I.O.; Leviga, B.I. (Вопросы атомной науки и техники, 2012)

Additional plasma heating, for example ICRF (Ion Cyclotron Range of Frequencies) heating, allows heating only a group of the fuel particles which will initiate the thermonuclear fusion reaction. But the ICRF heating scenarios ...
Efficiency of combined Fe and Pb radiation shield of transport casks for SNF transportation

Rudychev, V.G.; Azarenkov, M.O.; Girka, I.O.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2022)

The possibility of increasing the efficiency of combined iron and lead shielding of transport containers (TC) for SNF transportation by railroad is studied. Models for the transport of SNF γ-quanta are developed, that make ...
Efficiency of the dose rate calculation by Monte-Carlo method and point kernel method when handling radioactive waste

Rudychev, V.G.; Azarenkov, N.A.; Girka, I.O.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2018)

For the gamma-radiation sources with the volume up to 1 m³ , filled with typical radioactive waste generated at NPPs with WWER-1000 reactors, the results of the dose rate (DR) calculations made by Monte-Carlo (MCNP) ...
Efficiency of various materials application for radiation shielding at transportation and storage of spent nuclear fuel by dry method

Rudychev, V.G.; Azarenkov, N.A.; Girka, I.O.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2020)

A model of the transport container intended for transportation of spent nuclear fuel (SFN) is studied. The passage of γ-quanta from the major long-lived isotopes is examined. The radiation shields made of iron, lead and ...
Fast Alfvén wave propagation in milticomponent nonuniform plasmas

Kazakov, Ye.O.; Pavlenko, I.V.; Girka, I.O.; Weyssow, B. (Вопросы атомной науки и техники, 2008)

The problem of the conversion, reflection and transmission of the fast Alfvén wave propagating in multicomponent nonuniform plasmas is studied. The dependences of the wave scattering characteristics on the plasma composition ...
Fast wave mode conversion in multicomponent nonuniform plasmas

Kazakov, Ye.O.; Pavlenko, I.V.; Girka, I.O.; Weyssow, B. (Вопросы атомной науки и техники, 2008)

The ICRF mode conversion heating scenario relevant to the start-up phase of ITER operation is studied. The 1D theory of fast wave (FW) propagation in fusion plasmas is applied to study the inverted ICRF (³He)H scenario ...
ICRF heating of hydrogen plasmas with two mode conversion layers

Kazakov, Ye.O.; Van Eester, D.; Lerche, E.; Pavlenko, I.V.; Girka, I.O.; Weyssow, B. (2010)

ICRF mode conversion heating regime is widely used in present-day tokamaks. The theoretically predicted mode conversion enhancement due to the constructive interference of the fast wave reflected from the evanescence layer ...
Identification of the fuel rod cladding destruction from the change of the SNF storage casks radiation

Rudychev, V.G.; Azarenkov, N.A.; Girka, I.O.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2020)

Two options for changing the distribution of spent nuclear fuel due to the possible destruction of the cladding of fuel rods, which causes a change in radiation outside the cask, are considered for VSC-24 casks used for ...
Macroparticles in beam-plasma systems

Bizyukov, A.A.; Girka, I.O.; Romashchenko, E.V.; Chibisov, O.D. (Вопросы атомной науки и техники, 2016)

The macroparticle (MP) contamination is the most important technological problem of vacuum arc deposition of coatings. The results of theoretical study of MP charging and dynamics in the near-substrate sheath are ...
Optimization of bremsstrahlung characteristics for irradiating thick objects

Rudychev, V.G.; Azarenkov, M.O.; Girka, I.O.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2022)

The characteristics of bremsstrahlung (BS) irradiated at different angles from a three-layer converter made of Ta, water, and Fe, the electron energy is 7.5 MeV, was investigated. It is shown that Ta thickness increasing ...
Optimization of the bremsstrahlung converter

Rudychev, V.G.; Azarenkov, M.O.; Girka, I.O.; Lazurik, V.T.; Rudychev, Y.V. (Вопросы атомной науки и техники, 2022)

Variants of the formation of bremsstrahlung (BS) distributions along an extended converter, which ensures the maximum thickness of an object under two-sided and four-sided irradiation, are studied. For the target of the ...

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