Conveners
S1: Channeling & Radiations in Crystals
- Alexey Tishchenko (National Research Nuclear University "MEPhI")
Description
Session 1.4
Prof.
Anand Pathak
(University of Hyderabad)
07/10/2014, 16:30
Invited talk
The phenomenon of electron and positron channeling in a crystal affected by various imperfections has been investigated. We have continued our work on the quantum aspects of the positron channeling in a crystal bent by dislocations where the effects of longitudinal motion of the particle are also considered along with the transverse motion. These calculations are now extended to include...
Dr
Evgeny Mazur
(NATIONAL RESEARCH NUCLEAR UNIVERSITY MEPHI)
07/10/2014, 17:00
Oral
The mutual influence of the processes of radiation and generation of excitations in the quantum crystal with the channeled particle (electron or positron) is considered. The emergence of new peaks in the emission spectrum of such a channeled particle associated with the processes of simultaneous resonant hard gamma-quantum and plasmon excitation during its motion in the crystal is...
Prof.
Sergey Blazhevich
(Belgorod National Research University)
07/10/2014, 17:15
Oral
In the present work a theory of coherent radiation of a relativistic electron moving at a constant speed in a combined target, consisting of several amorphous matter layers and a monocrystalline layer is built. The expressions describing the amplitudes of diffracted transition radiation (DTR) and parametric X-ray radiation (PXR) are derived in the framework of two-wave approach of the dynamic...
Dr
Oleg Bogdanov
(LNF&TPU)
07/10/2014, 17:30
Oral
The well-known Tamm-Frank theory [1] describes the Cherenkov radiation (ChR) from relativistic charged particles moving uniformly and rectilinearly in an optically transparent radiator. There are two main reasons leading to deviations from this ideal character of motion: 1) multiple scattering – particle’s velocity vector changes [2]; 2) stopping in a radiator – particle’s velocity magnitude...
Dr
Erine Babakhanyan
(National Research Laboratory after A.I. Alikhanian (Yerevan Physics Institute), Armenia)
07/10/2014, 17:45
Oral
Consideration of moving of the fast charged particle in crystals within the classical theory framework is possible for protons, ions and other heavy particles of a specific range of energies, whereas for positrons and especially for electrons due to the presence of diffraction effects it is necessary the quantum description.
Redistribution of density of electrons and positrons during their...
Dr
Arsen Ghalumyan
(A. Alikhanian National Laboratory (Yerevan Physics Institute), Armenia, 0036, Alikhanian Br. Str. 2)
07/10/2014, 18:00
Oral
The work is devoted to the suppression of a few peaks in spectral distribution of coherent bremsstrahlung radiation of the relativistic electrons with 40-50 MeV energy and obtaining of new coherent intensive peaks at the presence of external acoustic field of 1.024 GHz frequency. It was experimentally shown that a new peak appear in the range of ~1keV. The quartz single crystal of X cut with...
