Speaker
Koryun Gevorgyan
(Yerevan State University)
Description
In the present work investigated the problem of radiation of positron bunch in the system of the packed nanotubes. In this work used model of the harmonic potential which is justified since on the one hand the number of positrons near the axis of the nanotubes region is small, and on the other hand their contribution to the formation of the total radiation is also small. The problem is solved in the dipole approximation. Due to the polarization of the medium the first harmonic radiates both extremely hard and extremely soft photons at zero angle.
The frequency-angular distribution of number of photons which is emitted by channelling positrons of bunch is recieved. It does not depend on the azimuthal angle, since the task has cylindrical symmetry. Photons which is emitted at a zero angle have circular polarization. Radiation have energy threshold: lower threshold is due to the polarization of medium of nanotube, the upper threshold depends on the amplitude of the oscillations of channelling positrons. When the energy of the bunch coincides with the upper threshold, the radiation contribute all channeled positrons. Each a positron in average radiates a one photon. Thus is formed intensive enough quasi-monochromatic, circularly polarized submillimeter photon beam, which may have important practical application.
Author
Koryun Gevorgyan
(Yerevan State University)
Co-authors
Hayk Gevorgyan
(Yerevan State University)
Lekdar Gevorgyan
(Yerevan Phisics Institute)
