On the parametric X-rays along an emitting particle velocity

Parametric X-rays along an emitting particle velocity is studied for the Bragg scattering geometry. The absence of discussed radiation yield in the case of thick enough target when an influence of a photoabsorption plays an important role is predicted. The correct boundary conditions for an emission field at the out-surface of absorbing semi-infinite crystalline target are discussedyesBelgorod State Universit

Spectrum of collimated X-rays emitted from relativistic electrons crossing an aligned crystal

Analytic description of X-ray emission from relativistic electrons crossing a thin aligned crystal is presented. The suggested model takes into account contributions of the transition radiation and coherent bremsstrahlung on atomic strings and has no limitations on the emitting particle energyyesBelgorod State Universit

Electromagnetically induced switching of ferroelectric thin films

We analyze the interaction of an electromagnetic spike (one cycle) with a thin layer of ferroelectric medium with two equilibrium states. The model is the set of Maxwell equations coupled to the undamped Landau-Khalatnikov equation, where we do not assume slowly varying envelopes. From linear scattering theory, we show that low amplitude pulses can be completely reflected by the medium. Large amplitude pulses can switch the ferroelectric. Using numerical simulations and analysis, we study this switching for long and short pulses, estimate the switching times and provide useful information for experiments

On the possibility of using parametric X-ray radiation to study anisotropy of a crystal mosaic structure

Parametric X-ray radiation (PXR) of relativistic electrons moving in a mosaic crystal is considered. A strong dependence of the PXR angular spectral distribution on the mosaic structure is shownyesBelgorod State Universit

An investigation of the parametric X-ray along the velocity of emitting particle

Parametric X-rays (PXR) along the velocity of relativistic electrons crossing a crystalline target is studied in this work. The detailed theory of PXRfor Laue scattering geometry is developed with account of contributions of both PXRand transition radiation (TR) to the total emission yield. An influence of photoabsorption and interference between PXRand TRon the forward PXR properties are studied. Most appropriate conditions for the real experiment devoted to forward PXRobservation are elucidated on the basis of the developed theory. The advantage of the use of heavy crystals with this aim in mind is shown. The expected experimental results are discussedyesBelgorod State Universit

Cherenkov effect and parametric X-rays

Self-diffracted Cherenkov X-rays emitted from relativistic electrons penetrating into the periodic multilayer nanostructure are consid-ered in this workyesBelgorod State Universit

Modification of the EDXD method for diagnostics of polycrystalline and fine-grained media

The possibilities of using broadband X rays for diagnostics of the atomic structure of solids are considered. It is proposed to use virtual photons of the Coulomb field of a relativistic electron beam as primary probe radiationye

IMAGE SHARPENING WITH BLUR MAP ESTIMATION USING CONVOLUTIONAL NEURAL NETWORK

We propose a method for choosing optimal values of the parameters of image sharpening algorithm for out-of-focus blur based on grid warping approach. The idea of the considered sharpening algorithm is to move pixels from the edge neighborhood towards the edge centerlines. Compared to traditional deblurring algorithms, this approach requires only scalar blur level value rather than a blur kernel. We propose a convolutional neural network based algorithm for estimating the blur level value

On X-ray sources based on Cherenkov and quasi-Cherenkov emission mechanisms

A variety of possible schemes of X-ray sources based on Cherenkov like emission mechanisms is considered theoretically. The possibility to increase substantially an angular density of parametric X-ray source under conditions of grazing incidence of emitting relativistic electrons on the reflecting crystallographic plane of a crystalline target is shownye

Observation of the enhancement of parametric radiation under conditions of the grazing incidence of relativistic electrons on the crystal surface

The enhancement of the yield of parametric X-ray radiation from 7-MeV electrons incident at a grazing angle on the silicon crystal surface has been experimentally detectedyesBelgorod State Universit