Alexandr Sporov

V. N. Karazin Kharkiv National University · Department of Artificial Intelligence and Software

This work is devoted to study of the dispersive properties of the slow electromagnetic waves that propagate along the planar waveguide structure that consists of semi-bounded plasma region, metamaterial slab and semibounded region of ordinary dielectric. It is studied the case when all media are homogeneous and isotropic. The dispersion properties,...

This article presents the results of theoretical study of the phase and attenuation properties of the dipolar electromagnetic modes in cylindrical plasma-vacuum-metal waveguide structure. Plasma is described in hydrodynamic approach and is supposed to be slightly non-uniform in axial direction and strongly non-uniform in radial direction. It was st...

The paper presents the results of the study of properties of fast surface electromagnetic waves that propagate along the flat interface between the active metamaterial and air (or vacuum). The case of homogeneous and isotropic metamaterial is considered. The dispersion properties, the wave spatial attenuation, the phase and group velocities, as wel...

The article presents the results of theoretical study of phase and attenuation characteristics of the symmetric electromagnetic wave in long waveguide structure that partially filled by radially non-uniform plasma immersed in external steady magnetic field. The results of theoretical study of stationary gas discharge sustained by this wave in the c...

The possibilities of the slow surface electromagnetic waves propagation along the flat boundary of a metasurface with a dissipative dielectric are studied. The metasurface is a thin flat slab of metamaterial with simultaneously negative permittivity and permeability with "amplification". All media were assumed to be isotropic. Dispersion dependence...

This article presents the results of the theoretical study of stationary state of gas discharge sustained by the electromagnetic wave with azimuth wavenumber m = −2 in three component magnetized plasma-metal waveguide structure of slightly varying radius of metal enclosure in the framework of electromagnetic model. It was studied the influence of t...

The mathematical model of superradiance of the system of nonlinear oscillators that are restricted in space is considered. Each oscillator generates its own field. The interaction of the oscillators occurs between each other and through the integral radiation field. The effects of nonlinearity of oscillators due to relativistic effects are taken in...

Equations describing the excitation of a TE wave by a beam of electrons rotating in an external magnetic field in a waveguide in two regimes were considered. In the first regime the interaction of the oscillators − rotating electrons in the magnetic field − was neglected. It was assumed that the beam electrons interact only with the waveguide modes...

The aim of this research is the construction of the electromagnetic model of the stationary state gas discharges in the diffusion regime in rather long narrow tubes of slightly variable radius in order to obtain plasma density axial distribution. In the framework of this model it was carried out the study of the external magnetic field value on the...

The properties of surface electromagnetic waves propagating along a planar structure consisting of an ideal dielectric, a dielectric layer with large losses and a high dielectric constant, and a left-handed metamaterial with "ampli-fication" are studied. All media were assumed isotropic. Dispersion relations for the eigenmodes of such a waveguide s...

In this paper, the self-consistent model was considered, consisting of a system of oscillators, the coupling between them was assumed to be integral (due to the fields formed as a result of their co-radiation). With the help of this model, the features of synchronization by waves of finite amplitude of a system of oscillators were refined, the init...

This paper studies the propagation and spatial attenuation of high-frequency eigen-symmetric and dipolar electromagnetic waves along a coaxial plasma–metal waveguiding structure that contains a slightly axial and strong radial non-uniform cylindrical plasma slab in an external azimuthal non-uniform magnetic field. The influence of such parameters a...

The mathematical model of superluminescence of a finite system of nonlinear oscillators is considered. With each oscillator generating its own field, the oscillators interact through integral field of radiation. The influence of nonlinearity of oscillators due to relativistic effects is taken into account. Characteristics of the synchronization pro...

A system of independent oscillators is considered. The interaction of the oscillators occurs through the field of the wave. The initial phases of the oscillators are random. The synchronization of the oscillators by an external field of large amplitude is discussed. The effect of nonlinearity due to relativistic effects is taken into account. It is...

It was studied the properties of electromagnetic surface waves in left-handed material slab bounded by two semi-infinite nonmagnetic media with frequency dependent positive permittivity. It was assumed that all these media are isotropic and non-dissipative. It was shown that the phase velocities of waves are greater than the speed of light, and the...

The purpose of this paper is to study the electrodynamic properties of eigen dipolar electromagnetic waves of coaxi-al metal waveguide filled by slightly axially non-uniform and strongly radially non-uniform cold dissipative plasma immersed in non-uniform azimuth external magnetic field. The influence of external azimuth magnetic field, geometric p...

This study is devoted to the dispersion properties of the electromagnetic surface eigen waves that propagate along the left-handed planar slab that is bounded by the air (vacuum) and the medium with positive plasma-like permittivity. Both the left-handed slab and the media are assumed to be isotropic and have zero losses. We present the results of...

This report is devoted to the investigation of the propagation peculiarities of the eigen dipolar electromagnetic waves in coaxial plasma-metal waveguide with non-uniform azimuth magnetic field. The dependence of the dispersion properties, spatial attenuation coefficient, radial wave field structure, phase and group velocities on the effective coll...

This work is devoted to the study of phase and group velocities of the surface eigen electromagnetic waves that propagate along the left-handed planar slab that bounded by the dielectrics with different permittivity values at the both sides of considered slab. It has been shown that the change of metamaterial slab thickness substantially influences...

The aim of this report is the investigation of influence of effective collision rate, the value of direct current that flows along the central conductor of the waveguide structure, waveguide geometric parameters and plasma density radial profile on the dispersion, spatial attenuation and radial wave field structure of high-frequency electromagnetic...

The peculiar properties of surface type electromagnetic waves that propagate along the planar waveguide structure with left handed material bounded by conventional dielectric regions with different permittivity were studied in this work. It was shown that difference in dielectric's permittivity essentially influences on the dispersion properties an...

This report is devoted to the investigation of the dispersion and the spatial distribution of the electromagnetic field of the surface type waves that propagate along the planar waveguide structure. This structure consists of the left-handed material slab, bounded by the semi-infinite regions of ordinary dielectric with constant permittivity and pe...

This report is devoted to the investigation of dispersion properties and spatial attenuation coefficient of the dipolar high-frequency electromagnetic wave that propagates along the coaxial magnetized waveguide structure with nonuniform azimuthal magnetic field, partially filled by uniform collisional plasma. The influence of effective collision fr...

This report is devoted to the investigation of dispersion properties, attenuation coefficient and radial wave field structure of high-frequency electromagnetic wave that propagates in coaxial magnetized waveguide structure with non-uniform azimuth magnetic field, partially filled by radial non-uniform collisional plasma. The influence of geometric...

This report is devoted to the investigation of the influence of electron collisions and radial non-uniformity of plasma density on phase characteristics, spatial attenuation and wave field structure of slow symmetric electromagnetic waves that propagate along cylindrical waveguide structure. It has been shown that collision rate and radial non-unif...

In this paper we study the mechanisms of wave-energy transformation in nonuniform waveguide plasmas maintained by surface modes in the presence of local upper-hybrid resonance. The dispersion equation is derived for such waves in the potential case with the following effects taken into account: the finite magnetic field, the finite electron tempera...

The problem concerning the dispersion properties of the slow extraordinary polarized electromagnetic surface waves on the harmonics of ion and electron cyclotron frequencies (SWCH) in magnetoactive plasma is studied. An external steady magnetic field is applied parallel to the plasma interfaces, rectangular with respect to the group velocity of the...

This report is devoted to the investigation of the influence of effective collision electron frequency and plasma density radial non-uniformity on the phase characteristics, spatial attenuation and wave field structure of slow symmetric electromagnetic waves that propagate along cylindrical waveguide structure. The waveguide structure consists of r...

This article presents the results of theoretical study of the axial structure of gas discharge that is sustained by a non-symmetric electromagnetic surface wave (SW) with azimuth wavenumber m = –2. The phase and attenuation characteristics of the wave, and the spatial wave field structure were studied as well. The wave considered propagates along t...

function of the ze ro order, μ is non-unifomity parameter. Such choice of a radial density profile allows one to model different discharge regimes with the help of changing nonuniformity parameter μ . The propagation of the nonsymetric potential SW along the discharge structure is governed b y the Poisson equation. Let us consider the ca se when pl...

The paper presents the results of a theoretical study of the dispersion properties, wave field structure and energy characteristics of travelling electromagnetic nonsymmetric surface waves that propagate along a magnetized plasma column surrounded by an infinite vacuum region. The waves with azimuth wave numbers m = ±2, ±3 were considered. An exter...

This report is devoted to research into the dispersion properties, damping rates and radial wave field structure for electromagnetic azimuth-symmetric high-frequency surface waves (SWs) in a radial inhomogeneous cylindrical waveguide structure with given plasma density radial profile. The dependence of the plasma density axial profile in the discha...

It is shown that electromagnetic surface waves propagating along the azimuthal angle can be excited efficiently by an annular electron beam in a cylindrical metal waveguide partially filled with a magnetoactive plasma. A self-consistent system of differential equations is obtained to describe the nonlinear interaction between the beam particles and...

Dispersion properties of slow electromagnetic surface waves propagating on the harmonics of the electron cyclotron frequency across the external steady magnetic field are studied in the case when the magnetic field is parallel to the plasma - metal interface. Theoretical investigation of these surface modes is carried out using the kinetic descript...

Summary form only given. The report is devoted to the investigation of the parametric excitation of the surface waves on the second harmonic of electron cyclotron frequency (SW) in an uniform planar plasma layer bounded by two thick dielectric slabs. The external steady magnetic field B&oarr;₀ is applied parallel with respect to the plas...

A study is made of the dispersive properties of slow electromagnetic surface waves that propagate transverse to a constant external magnetic field oriented parallel to the planar plasma-metal interface and whose frequencies are the harmonics of the ion cyclotron frequency. These waves are studied theoretically using a kinetic approach and a model o...

The parametric instability of surface waves on the second harmonic of electron cyclotron frequency (SWCF) in a plasma filled dielectric wave guide is examined in a kinetic approximation. The studied surface waves are extraordinary polarized modes and propagate across the external steady magnetic field. The amplitude of the electrical pump wave is a...

Summary form only given. This paper is devoted to the investigation of the dispersion properties of slow electromagnetic surface waves on the harmonics of ion and electron cyclotron frequencies (SCW) in a planar metal waveguide with plasma filling. The plasma layer is bounded at the planes x=0, a by metal slabs. The external steady magnetic field B...

This report is devoted to the investigation of dispersion properties, attenuation coefficient and radial wave field structure of axially-symmetric high-frequency electromagnetic E–wave. The wave considered propagates in coaxial mag-netized waveguide structure, partially filled by radially non–uniform dissipative plasma with radially non–uniform azi...

The report presents the results of theoretical research of plasma density axial structure in gas discharge sustained b y the travelling slightly-damping nonpotential quadrupolar surface wave (SW) with azimuthal wave number ± = in diffusion controlled discharge regime. SW propagates in three components waveguide structure that consists of a cylindri...

This report is devoted to the study of the non-symmetric high frequency surface wave (SW) properties (dispersion properties, attenuation coefficient and radial wave field structure). Axial plasma density distribution under the condition of the diffusion mechanism of charged particle losses was studied as well. SW considered propagates in magnetized...

The study of microwave gas discharge produced and sustained by travelling electromagnetic waves is of great interest due to their numerious applications in plasma chemistry and technology. A theoretical model of a plasma producer based on the surface cyclotron waves (SCW) propagation in plasma filled metal waveguide with a dielectric sheath is pres...