Coordinatori
Poster Session 1: PS1: Poster session
- Luca Porcelli (Istituto Nazionale di Fisica Nucleare)
We present a novel Python tool for the analysis of Geant4 simulations that enhances our understanding of coherent phenomena occurring during the interaction of charged particles with crystal planes. This tool compares the total energy of particles with the potential energy inside crystal channels, enabling a complete examination of coherent effects. By tracking and tagging the dynamics of each...
The twisted photon is a state of a free electromagnetic field with the certain energy, longitudinal projection of the momentum, projection of the total angular momentum and helicity. Various schemes of production of the twisted photons have been proposed recently. The undulators [1-5] and free electron lasers [6-8] are used in these schemes. High energy twisted photons can also be generated by...
When a fast charged particle induces polarization currents in a medium, these currents become a source of polarization radiation. Polarization radiation Vavilov-Cherenkov, transition, Smith-Purcell and other radiations. Although polarization radiation has a microscopic nature, its microscopic description is not well developed.
Here we present the preliminary results of microscopic theory of...
Currently, NRC «Kurchatov Institute» jointly with partners is developing the 4th generation synchrotron radiation source SYLA (Synchrotron + Laser) with an energy of
6 GeV [1]. This facility will consist of a source based on a storage ring and a free electron laser (FEL). As one of the options, an RF gun with a photocathode will be used to generate short high-brightness electron bunches for...
Radiofrequency (RF) photoinjectors are widely utilized to generate bright electron bunches for light sources. In RF photoinjectors, pico- and subpicosecond laser pulses meet the photocathode surface, resulting in photoemission. Although there are well-recommended models and approaches to describe photoemission in RF photoinjectors, some dark spots in understanding and theory-to-experiment...
The quantum mechanical problem of the angular distribution of particles at the exit from a curved crystal is considered. Preliminary results have shown that the addition of a some perturbation to the average atomic potential leads to a deformation of the angular distribution function of channeled particles at the exit from a bent crystal. But the angular distribution function of channeled...
The concept of a pyroelectric accelerator entails a compact device that does not require an external high-voltage circuit or the use of hazardous materials. This enables the generation of an electron flow within a narrow energy range, which converges at a certain distance from the surface of the pyroelectric crystal when its temperature changes in a vacuum. Utilizing a target with a hole...
Accelerators of charged particles are powerful tools used in many fundamental researches and applied tasks. Compact accelerators are currently widely employed for pretesting and proof-of-principle experiments for MegaScience projects, as well as for applied purposes. In particular, electron accelerators allowing generating of few MeV beams are used for testing of different techniques of beam...
Coherent TR (CTR) is generated when the radiation wavelength is comparable to or longer than the bunch length. In that case, all particles emit radiation more or less in phase, and the radiation intensity is proportional to a square of the number of particles in a bunch. However, if we have a sequence of bunches (a train) separated by a fixed distance from one another, the radiation is...
The article discusses the prerequisites for the implementation of stimulated laser generation of short-wave (including X-ray) radiation based on a system of fast electrons channeled in a standing light wave. It is shown that considering all the features of the quantum states of such particles makes it possible to determine the conditions for implementing such short-wave lasers. To optimize...
In the paper, calculations were made on resonance capture of valence electrons by non-relativistic protons channeled in carbon nanotubes. The probabilities of the formation of hydrogen atoms with such capture were calculated using the non-stationary perturbed theory. Ionization processes are also analyzed and it is shown that in a certain range of speeds a sufficiently high yield of neutral...
When a charged particle penetrating through the half-wavelength crystals (HWC) it experiences a half of the channeling oscillation. The crystal planes deflect the beam, i.e. mirror-reflection of the beam. The mirror-reflection phenomenon for 2 MeV protons in a half-wavelength Si crystal has been previously proved [1]. At relativistic energies, the mirroring effect was observed for 400 GeV...
In this work, as a result of the numerical solution of the system of kinetic equations for weakly relativistic positrons channeled both along the basal and prismatic planes and along the c-axes in the hexagonal crystals under study, the populations of quantum levels of transverse energy are found as a function of the longitudinal coordinate. The widths of levels and the probabilities of...
Two 4th generation synchrotron radiation sources will be in Russia soon. One of it is 3 GeV SKIF in Koltsovo and the another one is 6 GeV SYLA in Protvino (former SSRS-4 and USSR). Both were digned for equlibrium horizontal beam emittance is about 70 pm. The current activities on the SYLA project will be presented. As in most similar state-of-the-art facilities, electron beams will be injected...
It is known that the mosaic nature of the crystal significantly affects the characteristics of the radiation of fast electrons, and the degree of this influence depends on the radiation mechanism. The intensity of radiation at the Bragg angle increases sharply due to the additional contribution of diffracted real photons of transition and bremsstrahlung radiation [1], peaks in the spectra of...
