Papers by Konstantin Batrakov
www.mdpi.com/journal/applsci
Physics Letters A, 2007
ABSTRACT Experimental observation of X-ray radiation from nonrelativistic (50–100 keV) electrons ... more ABSTRACT Experimental observation of X-ray radiation from nonrelativistic (50–100 keV) electrons in crystals is reported and described as resulted from interference between parametric X-rays and coherent Bremsstrahlung. Possibility to tune X-rays frequency by crystal target rotation is demonstrated for the first time. Experiment details are discussed.
Journal of Nanophotonics, 2010
ABSTRACT not available.
Journal of Nanophotonics, 2010
Numerical methods for solving systems of differential equations arising in the simulation of volu... more Numerical methods for solving systems of differential equations arising in the simulation of volume free electron lasers are developed, and numerical experiments are discussed.
2017 International Applied Computational Electromagnetics Society Symposium - Italy (ACES), 2017
The ability of graphene and other nm-thin carbon films including pyrolytic carbon (PyC) and pyrol... more The ability of graphene and other nm-thin carbon films including pyrolytic carbon (PyC) and pyrolyzed photoresist (PPF) to absorb microwave radiation is discussed. We show that being deposited on a properly chosen optically transparent dielectric substrate these films can provide more than 20 dB electromagnetic interference (EMI) shielding efficiency (SE).
The dispersion of surface plasmons in multi-walled carbon nanotubes is theoretically studied. The... more The dispersion of surface plasmons in multi-walled carbon nanotubes is theoretically studied. The possibility of strong retardation of electromagnetic wave is demonstrated exceeding the retardation in single-walled CNTs. The quantum field consideration using the creation and annihilation operators for electron is used for the derivation of the surface plasmon dispersion equation. The analysis performed demonstrate a high potentiality of multi-walled CNTs for the nano-scale realization of the traveling wave tube.
ROTOR aims at developing THz detector that shows beyond the state-of-the-art key performance indi... more ROTOR aims at developing THz detector that shows beyond the state-of-the-art key performance indicators for space applications. Being ultralight and having remarkable radiation tolerance ROTOR detector is based on submicron thick stacks of exfoliated graphene and other 2D layered materials and utilizes thermo-electric and Dyakonov-Shur effects. Proof-of-concept realization of the tunable, submicron thick and radiation-tolerant THz detector brings ROTOR to TRL 4, i.e. the Component Laboratory Validated. In response to the societal challenges, within ATTRACT Phase 2 extended consortium will build a prototype and validate in the real environment the THz bio-sensor of revolutionary sensitivity (real-time single biomolecule detection and identification) based on the validated ROTOR technology.
In this paper a mathematical model of Volume Free Electron Lasers (VFEL) is described. It proved ... more In this paper a mathematical model of Volume Free Electron Lasers (VFEL) is described. It proved itself be effective in simulation of different schemes of VFEL. Numerical results obtained confirm all originated in VFEL physical laws.
The electromagnetic (EM) response of multi-wall carbon nanotubes (MWCNT) prepared by chemical vap... more The electromagnetic (EM) response of multi-wall carbon nanotubes (MWCNT) prepared by chemical vapor decomposition (CVD) method has been analyzed in the microwave frequency range. EM absorption properties of MWCNT depend on their medium diameter related to their conductivity, concentration of highly dispersed Fe-Co metal particles localized inside and in the tips of nanotube. MWCNT display high EM absorption in microwaves and can be used as fillers for the design of the effective EM coatings. Key-Words: carbon nanotube, microwave, electromagnetic absorption, coating
arXiv: High Energy Physics - Phenomenology, 1999
We consider the effects of the deuteron spin rotation and oscillations at the matter which is pro... more We consider the effects of the deuteron spin rotation and oscillations at the matter which is proportional to the real part of the deuteron spin-dependent forward scattering amplitude. That gives a possibility of a direct measurement of this quantity. Spin-dependent forward scattering amplitude of the deuteron on an unpolarized proton is discussed in terms of the Glauber multiscattering theory. This amplitude is determined by the nucleon rescattering, nonsphericity of the deuteron and spin-dependent nucleon-nucleon scattering amplitude. Thus deuteron spin oscillation phenomenon represents a method for N-N scattering amplitude investigation, including its real part, over a broad energy range.
2017 International Applied Computational Electromagnetics Society Symposium - Italy (ACES), 2017
Terahertz lasing by electron beam propagating over a graphene/dielectric sandwich structure is co... more Terahertz lasing by electron beam propagating over a graphene/dielectric sandwich structure is considered. A dispersion equation for the surface electromagnetic modes propagating along graphene sheets is derived and Čerenkov synchronism between surface wave and electron beam is predicted at achievable parameters of the system. The generation frequency tuning is proposed by varying the graphene doping, the number of graphene sheets, the distance between sheets, etc.
Effect of guiding magnetic field on evolution of stimulated emission is considered. It is shown t... more Effect of guiding magnetic field on evolution of stimulated emission is considered. It is shown that the transverse dynamics of electrons contributes to generation process and that contribution decreases with the magnetic field grows. The equation of generation for stimulated radiation of electron beam passing over periodic medium in magnetic field of arbitrary value is derived. The critical value of guiding field for which the transverse dynamics of electron don't contribute to emission is determined. It is shown, that transverse dynamics of electron modifies the boundary conditions. It follows from the derived generation equation that transverse dynamics yields to ~25% increase of the increment magnitude in high gain regime. In the limit of small signal the generation gain twice increases when transverse dynamics evolves. Obtained results are valid for every FEL system, which use the mechanism of waves slowing in the slow-wave structures for generation.
AbstractFirst observation of generation in the backward wave oscillator with a ”grid” diffrac-tion... more AbstractFirst observation of generation in the backward wave oscillator with a ”grid” diffrac-tion grating and lasing of the volume FEL with a ”grid” volume resonator that isformed by a perodic set of metallic threads inside a rectangular waveguide is con-sidered. Key words: Volume Free Electron Laser (VFEL), Volume Distributed Feedback(VDFB), diffraction grating, backward wave oscillator PACS: 41.60.C, 41.75.F, H, 42.79.D Generation of radiation in millimeter and far-infrared range with nonrel-ativistic and low-relativistic electron beams gives rise difficulties. Gyrotronsand cyclotron resonance facilities are used as sources in millimeter and sub-millimeter range, but for their operation magnetic field about several tens ofkiloGauss (ω ∼ eHmc γ)isnecessary. Slow-wave devices (TWT, BWT, orotrons)inthis range require application of dense and thin (< 0.1 mm) electron beams,because only electrons passing near the slowing structure at the distance≤ λβγ/(4π) can interact with electromagne...
Interaction of non-relativistic electrons with single crystal target may produce coherent x-rays.... more 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 obt...
Nanomaterials
We experimentally and theoretically investigated the effects of ionizing radiation on a stack of ... more We experimentally and theoretically investigated the effects of ionizing radiation on a stack of graphene sheets separated by polymethyl methacrylate (PMMA) slabs. The exceptional absorption ability of such a heterostructure in the THz range makes it promising for use in a graphene-based THz bolometer to be deployed in space. A hydrogen/carbon ion beam was used to simulate the action of protons and secondary ions on the device. We showed that the graphene sheets remain intact after irradiation with an intense 290 keV ion beam at the density of 1.5 × 1012 cm−2. However, the THz absorption ability of the graphene/PMMA multilayer can be substantially suppressed due to heating damage of the topmost PMMA slabs produced by carbon ions. By contrast, protons do not have this negative effect due to their much longer mean free pass in PMMA. Since the particles’ flux at the geostationary orbit is significantly lower than that used in our experiments, we conclude that it cannot cause tangible d...
2018 International Conference on Electromagnetics in Advanced Applications (ICEAA), Sep 1, 2018
Heterostructures combining graphene layers, dielectric slabs and even metallic substrates are int... more Heterostructures combining graphene layers, dielectric slabs and even metallic substrates are interesting systems to look at in view of their potential applications in microwaves and terahertz. A short review of their properties is presented, together with possible applications such as shielding layers, polarizers and plasmonic devices. In the near infrared and visible range, a graphene layer modifies the Brewster angle of the substrate that supports it. This effect leads to a non-destructive technique to count the number of atomic planes the graphene is made of.
Journal of the Belarusian State University. Physics
Slowing down the phase velocity of light in media has various applications. The generation of ele... more Slowing down the phase velocity of light in media has various applications. The generation of electromagnetic radiation using coherent Cherenkov mechanism is among them. Meanwhile, there is a need for compact terahertz radiation sources. Due to outstanding graphene properties, heterostructures consisting of alternating graphene/dielectric layers can operate as a medium for the generation of terahertz radiation. In the present paper, the slowing down and propagation coefficients for the modes supported in a two-layer graphene structure are studied. The study is conducted by means of the operator approach to wave propagation in stratified structures. The operator approach allows one to use coordinates-free notations and to consider consequently arbitrarily complex heterostructures (including anisotropic layers, for instance). The influence of interlayer distance and the value of graphene chemical potential on waves slowdown is determined. The obtained results open up prospects for cre...
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Papers by Konstantin Batrakov