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A. A. Gurinovich

Publications and source records attributed to A. A. Gurinovich.

17 recordsLinked to original sources
arXiv2025

About possibility to observe spin dichroism effect (the effect of tensor polarization acquiring) for the effect of tensor polarization acquiring by a nonpolarized deuteron beam passing through the nonpolarized internal target of Nuclotron

Deuteron passage through a nonpolarized target is accompanied by birefringence effect which reveals as diverse phenomena, namely: rotation of spin and tensor polarization about the momentum direction, spin oscillations, vector polarization conversion to tensor that and vice versa, spin dichroism. Possibility to study deuteron spin dichroism effect i.e. the effect of tensor polarization acquiring by a nonpolarized deuteron beam moving in NuclotronM and passing through its internal target is discussed.

nucl-th↗
arXiv2018

Photonic Crystal-Based Compact High-Power Vacuum Electronic Devices

This paper considers how the finite dimensions of a photonic crystal placed inside a resonator or waveguide affect the law of electron beam instability. The dispersion equations describing e-beam instability in the finite photonic crystal placed inside the resonator or waveguide (a bounded photonic crystal) are obtained. Two cases are considered: the conventionally considered case, when diffraction is suppressed, and the case of direct and diffracted waves having almost equal amplitudes. The instability law is shown to be responsible for increase of increment of instability and decrease of length, at which instability develops, for the case when amplitude of diffracted wave is comparable with that of direct one, that happens in the vicinity of $π$-point of dispersion curve. Application of photonic crystals for development of THz sources at electron beam current densities available at modern accelerators is discussed.

physics.acc-ph↗
arXiv2018

Electrostatic cumulation of high-current electron beams for terahertz sources

The electrostatic cumulation of current density in relativistic vacuum diodes with ring-type cathodes is described theoretically and confirmed experimentally. The distinctive feature of the suggested cumulation mechanism is a very low energy spread of electrons. As a result of electrostatic cumulation, a thin relativistic electron beam with a current density of 1 kA/mm$^2$ can be formed. This quantity exceeds typical current density values in high-current Cherenkov sources by an order of magnitude. Such a beam can be used as an active medium in high-power terahertz sources.

physics.acc-ph↗
arXiv2017

2D simulation of helical flux compression generator

Diverse approaches to HFCG's inductance,resistance and armature expansion calculating are evaluated. Comparison of simulated and experimentally obtained results is provided. Validity criteria for different simulation models are proposed. Consideration of armature acceleration under the pressure of detonation products is shown to be beneficial for accuracy of HFCG simulation. Control of HFCG temperature during simulation enables detecting critical points of system operation.

physics.plasm-ph↗
arXiv2015

Cumulation of High-current Electron Beams: Theory and Experiment

A drastic cumulation of current density caused by electrostatic repulsion in relativistic vacuum diodes with ring-type cathodes is described theoretically and confirmed experimentally. The distinctive feature of the suggested cumulation mechanism over the conventional one, which relies on focusing a high-current beam by its own magnetic field, is a very low energy spread of electrons in the region of maximal current density that stems from a laminar flow profile of the charged-particle beam.

physics.acc-ph↗
arXiv2014

Quasi-Cherenkov Radiation from Relativistic Particles Passing Through a Photonic Crystal

The expressions for spectral-angular distribution of quasi-Cherenkov radiation emitted by a relativistic particle traversing a photonic crystal are derived. It is shown that for a relativistic particle, passing through a photonic crystal formed by periodically strained threads, the intensity of quasi-Cherenkov radiation emitted at small angles to the direction of particle motion, as contrasted to ordinary Cherenkov radiation, exhibits anisotropic properties as the the photon momentum is rotated about the direction of particle motion (as the crystal is rotated about the direction of particle motion at fixed-angle observation of the outcoming photon). The intensity of quasi-Cherenkov radiation in terahertz and optical ranges is shown to be high enough to allow the experimental study of quasi-Cherenkov radiation in these frequency ranges.

physics.optics↗
arXiv2013

Photon Emission from Charged Particles Moving in Undulators Placed in a Photonic Crystal

The law of photon radiation from electron beams passing through a photonic crystal in the presence of an undulator is considered. The spectral-angular distribution and the time evolution of radiation is found. It is shown that the characteristics of the radiation intensity in time demonstrate oscillations due to the interference between undulator and parametric (quasi-Cherenkov) radiations.

physics.optics↗
arXiv2011

Time duration of the parametric x-ray radiation

Time evolution of the parametric X-Ray radiation, produced by a relativistic charged particle passing through a crystal, is studied. The most attention is given to the cases when the radiation lasts much longer (t_{PXR} ~0.1 ns) than the the time t_p of the particle flight through the crystal (t_p ~ 1 ps). It is shown that such long duration of the radiation makes possible the detailed experimental investigation of the complicated time structure of the parametric X-ray pulses, generated by electron bunches, which are available with modern acceleration facilities.

physics.acc-ph↗
arXiv2011

Time Dependence of the Intensity of Diffracted Radiation Produced by a Relativistic Particle Passing through a Natural or Photonic Crystal

The formulas which describe the time evolution of radiation produced by a relativistic particle moving in a crystal are derived. It is shown that the conditions are realizable under which parametric (quasi-Cherenkov) radiation, transition radiation, diffracted radiation of the oscillator, surface quasi-Cherenkov and Smith-Purcell radiation last considerably longer than the time of the particle flight through the crystal. The results of carried out experiments demonstrate the presence of additional radiation peak appearing after the electron beam has left the photonic crystal.

physics.acc-ph↗
arXiv2010

Radiative instability of a relativistic electron beam moving in a photonic crystal

The radiative instability of a beam moving in a photonic crystal of finite dimensions is studied. The dispersion equation is obtained. The law $Γ\sim ρ^{1/\left( {s + 3} \right)}$ is shown to be valid and caused by the mixing of the electromagnetic field modes in the finite volume due to the periodic disturbance from the photonic crystal.

physics.acc-ph↗
arXiv2009

Hybrid systems with virtual cathode for high power microwaves generation

It is shown that use of a photonic crystal enables to construct several types of hybrid systems with virtual cathode, which could radiate due to different radiation mechanisms (bremsstrahlung and diffraction (transition) radiation) with different frequencies. Also mentioned that photonic crystal makes possible to create phase-locked array of generators.

physics.acc-ph↗
arXiv2006

Generation of radiation in free electron lasers with diffraction gratings (photonic crystal) with the variable spacial period

The equations providing to describe generation process in FEL with varied parameters of diffraction grating (photonic crystal) are obtained. It is shown that applying diffraction gratings (photonic crystal) with the variable period one can significantly increase radiation output. It is mentioned that diffraction gratings (photonic crystal) can be used for creation of the dynamical wiggler with variable period in the system. This makes possible to develop double-cascaded FEL with variable parameters changing, which efficiency can be significantly higher that of conventional system.

physics.acc-ph↗
arXiv2005

Spin rotation and oscillations for high energy particles in a crystal and possibility to measure the quadrupole moments and tensor polarizabilities of elementary particles and nuclei

It is shown that particle motion in a bent (straight) crystal is accompanied by particle spin rotation and oscillations that allows to measure the tensor electric and magnetic polarizabilities of nuclei and elementary particles. It is shown that channelling of particles in either straight or bent crystal with the polarized nuclei could be used both to analyze polarization of high energy particles and polarize them.

hep-ph↗
arXiv2005

Experiments with Parametric X-Ray Radiation (PXR) from Non-Relativistic Electrons

Interaction of non-relativistic electrons with single crystal target may produce coherent x-rays. That is the result of interference between two known x-ray generation mechanisms having orientational behavior, namely parametric x-rays and coherent {\it Bremsstrahlung}. Experiments aimed to PXR research were performed with 50-100 keV electrons and its distinctive features were observed. Requirements to the experimental set-up, detector instrumental response, and targets as well as experiment geometry are discussed in detail. Series of PXR spectra in various conditions were recorded and their distinctive features were observed. Tuning of radiation frequency with crystal-target rotation was observed for the first time for low energy electrons. Dependence of the x-ray frequency on the beam energy was detected. Soft PXR peak with energy below 1 keV was observed for the first time. Possible applications of PXR for structure analysis and crystallography are discussed. These results are obtained in the framework of ISTC project {#}B626

physics.ins-det↗
arXiv2005

Spin rotation and birefringence effect for a particle in a high energy storage ring and measurement of the real part of the coherent elastic zero-angle scattering amplitude, electric and magnetic polarizabilities

In the present paper the equations for the spin evolution of a particle in a storage ring are analyzed considering contributions from the tensor electric and magnetic polarizabilities of the particle. Study of spin rotation and birefringence effect for a particle in a high energy storage ring provides for measurement as the real part of the coherent elastic zero-angle scattering amplitude as well as tensor electric and magnetic polarizabilities. We proposed the method for measurement the real part of the elastic coherent zero-angle scattering amplitude of particles and nuclei in a storage ring by the paramagnetic resonance in the periodical in time nuclear pseudoelectric and pseudomagnetic fields.

hep-ph↗