ASRP 2025 - Alpic School for Radiation Physics

Session

Oral Session S19-2

S19-2

19 Jun 2025, 17:00

Yerevan

Conveners

Oral Session S19-2

• Alessandro Curcio

79. Cherenkov Radiation from Transparent Plate for Beam Diagnostics

Mikhail Shevelev

19/06/2025, 17:00

Optical beam diagnostics based on transition radiation (TR) is widely used to measure both transverse and longitudinal bunch sizes. However, in installations based on modern acceleration techniques (laser-plasma, etc.), the intensity of the resulting beam may be insufficient for TR diagnostics. The application of alternative, more intense radiation mechanisms will improve the accuracy of...

103. Observation of Coherent Cherenkov Radiation from a Pair of Electron Bunches at the AREAL Accelerator

Sonya Khosrovyan (IAPP NAS RA)

19/06/2025, 17:20

The results of an experimental study of the spectral distribution of coherent Cherenkov radiation from a pair of electron bunches at the AREAL Accelerator are presented. As a target, a cylindrical Teflon resonator is used. Coherent effects were studied depending on the distance between the bunches, which varied from 2 to 11 ps. Radiation was recorded using QOD (Broadband Quasi- Optical...

95. Peculiarities of Radiation of a Relativistic Electron Passing Through a Dielectric Ball

Gayane Margaryan

19/06/2025, 17:40

The results of theoretical and Geant4 simulations studies of the spectral and angular distributions of the radiation generated by a charged particle crossing a dielectric ball, inserting in vacuum, are presented. Previously, for non dispersive dielectric ball it was shown that for certain values of the problem parameters the radiation can exhibit a resonant character in narrow frequency...

102. Energy fluxes for surface polaritons emitted by annular beams in cylindrical waveguides

Gor Chalyan (Yerevan State University)

19/06/2025, 18:00

We investigate the radiation emitted by a circular annular electron beam propagating parallel to the axis of a dielectric cylinder embedded in a homogeneous medium. Expressions are provided for the potentials and the strengths of the electric and magnetic fields inside and outside the cylinder, considering a general dispersion relation for the two media. The energy flux through the plane...

70. Studies of the Characteristics of the Extended Quasar 0735+17 and the Distribution of Extragalactic Sources Around It

Hovhannisyan Vahe (https://indico.cern.ch/event/1525866/abstracts/)

19/06/2025, 18:20

The identifications of radio sources with angular sizes greater than 20' with quasars are not definite. Quasars cannot be radio sources with such large dimensions. They are very compact not only in the optical domain but also in the radio domain. The reason these radio sources are identified with quasars is due to the presence of a compact radio source within the extended radio source, which...