Suppression of density effect in the polarization bremsstrahlung for relativistic charged particles crossing a thin target

The peculiarities of polarization bremsstrahlung emitted when a relativistic charged particle penetrates a thin layer of an amorphous medium are consideredyesBelgorod State Universit

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

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

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

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

Program for experimental investigations of the mechanisms for the emission of coherent radiation by relativistic electrons with energies of 10-500 MeV in oriented crystals

A program of experimental investigations of the mechanisms for the emission of coherent radiation by electrons in periodic structures is proposed. The program is aimed at developing sources of energy-tunable quasimonochromatic x radiation and y radiationyesBelgorod 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

Dynamical-diffraction effects in parametric radiation

An analytic theory is developed for dynamical-diffraction effects in x-ray radiation from a relativistic electron traversing a thin single crystal. It is shown that such dynamical effects may be responsible for a glaring discrepancy between recent experimental data and the traditional theory of parametric x-ray radiationyesBelgorod State Universit

Defining the distribution function of mosaic crystal grains on orientation angles using synchrotron radiation

A new method of measuring the angular distribution function of grains in mosaic crystals is proposed and studiedye

Collimator-size effect on the parametric-radiation spectrum

It is shown that, by varying the angular size of a collimator, the spectral distribution of parametric x-ray radiation can be split into two isolated peaks and that the center of the spectral distribution of this radiation is shifted in frequency in response to an increase in the collimator sizeyesBelgorod State Universit