Currently, the search of new ways to generate monochromatic radiation is continued. One of the possible ways to generate such radiation is the use of transition radiation from the grating (so-called grating transition radiation) [1, 2]. However, up to date there is no theory which was developed to describe the spectral characteristics of this radiation [3].
This work presents the analytical...
The description of the diffraction radiation on the conductive sphere based on the method of images known from electrostatics has been proposed in [1, 2]. The developed approach was successfully used to calculate the polarization of the radiation [2, 3]. The method for determining the azimuth of a trajectory of the moving particle relatively the center of the sphere using a single...
When a charged particle moves parallel to a medium with a periodically changing refractive index, Smith-Purcell radiation occurs. In this report, we consider the radiation that occurs when a charged particle passes parallel to a 1D (one-dimensional) fractal diffraction grating. Such a grating can be considered as an array of sub-gratings similar to the original one. To describe it, we will...
The Ultimate Source of Synchrotron Radiation (USSR) being developed at the NRC «Kurchatov Institute» will include 6 GeV storage ring with 7BA lattice which will allow to obtain a transverse emittance value of about 50 pm rad and a free electron laser. One linear accelerator for full energy is considered as the main top-up injector into the storage ring and as a driver of high-brightness...
Here we discuss the creation and implementation into Geant4 [1] of a new C++ module for channeling radiation (CR) simulation. The module we create is built into Geant4 as a discrete set of physical processes [2]. Such a form of integration makes it possible to combine new physical processes in single crystals with those already built into Geant4 (ordinary bremsstrahlung, different types of...
Periodic structures as well as crystal structures can be used to generate tunable quasi-monochromatic X-rays. When a fast charged particle crosses a layered structure, various types of soft X-rays are produced, including parametric X-ray radiation (PXR) and diffracted transition radiation (DTR).
We present the results of an experimental study of the radiation generated in Co/C (period 5.10...
In our paper [1] we considered the non-dipolarity of axial channeling radiation (CR) generated in a tungsten single crystal at electron-beam energies of several GeV. It was shown that the non-dipole approximation results in a considerable variation of the CR spectrum. In this report, we explain this variation by means of the CR angular distribution calculation. Within the dipole approximation,...
The positively charged particles can perform the axial channeling in the small potential well formed between three neighboring [111] strings of the Silicon crystal. The transverse motion of the particle in the well is quantized in the quantum mechanical limit. The structure of the wave functions of the stationary states is of interest for the searching the quantum chaos manifestations in the...
In this report, we present the theoretical background of the planned experimental investigation of optical Cherenkov radiation generated by moderately relativistic ion beam in target with frequency dispersion. The target material is a CVD-diamond. It is planned to conduct experiments on the basis of MARUSYA facility in the SPD test zone of the NICA accelerator complex. The available ion energy...
The method of images [1] permits to describe the transition radiation not only on the infinite conducting plane [2], but also on the dihedral angle with the opening equal to the divisor of 180 degrees. Here we describe the transition radiation arising under the fast charged particle’s incidence on the target of two conducting half-planes that make rectangular dihedral angle (when the incidence...
Previously, in [1-6], it was experimentally shown that the quasi-monochromatic radiation is generated when an electron beam interacts with a multilayer structure of an X-ray mirror in the direction of the Bragg diffraction. The spectrum of this radiation depends on the period of the structure and the tilt angle of the target relative to the electron beam. Here we present the results of the...
Structures such as multilayer X-ray mirrors can be effective sources of vacuum ultraviolet and ultra-soft X-ray radiation with tunable radiation energy [1-3]. The emission band is determined by the period of the multilayer structure, the number of layers, and the tilt angle of the structure θ0 with respect to the direction of an electron beam. The main contribution to the radiation is made by...
Novosibirsk free electron laser (NovoFEL) facility operates with three FELs. The FELs are installed on one-, two- and four- track energy recovery linacs (ERLs) with a common accelerating system. The ERL type of accelerator allows to achieve high average electron current (ordinarily about 10 mA) and to get the high average FEL power generally more than 100 W). The new diagnostic system was...
The paper considers the features of positron channeling in non-chiral carbon nanotubes (CNTs) of types (8, 0), (10, 0), (12, 0), (8, 8), (10, 10) and (12, 12). The conditions under which the approximation U(\rho) = \alpha \rho^2 can be used for the interaction potentials of these positrons with the inner walls of CNTs are studied.
For such an approximation, the numerical values of the...
The analogy of the Cherenkov radiation (ChR) theory with the theory of diffraction was first noted by I.M. Frank, who connected the ChR coherence condition with Fresnel zones, see a detailed presentation in the review by B.M. Bolotovsky [1]. This relationship has been traced for ChR with uniform and rectilinear motion of a charged particle in an optically transparent radiator. In the case of a...
The results of published works and the author's dissertation on coherent radiation of electrons channeled in crystals under the influence of resonant laser or ultrasonic waves are presented sequentially, with clarification and emphasis on fundamental points, excluding detailed mathematical transformations given in the originals. Theoretical questions and their software implementation in...
