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Radiation Effects in Inhomogeneous Systems


Radiation effects in inhomogeneous systems: Application in beam diagnostics and THz sources

Tech Area / Field

  • PHY-PFA/Particles, Fields and Accelerator Physics/Physics
  • PHY-PLS/Plasma Physics/Physics
  • PHY-RAW/Radiofrequency Waves/Physics

3 Approved without Funding

Registration date

Leading Institute
Institute of Radiophysics and Electronics, Armenia, Ashtarak-2


  • University of Oslo / Oslo University College, Norway, Oslo\nThomas Jefferson National Accelerator Facility, USA, VA, Newport News\nCalifornia State University, Bakersfield, USA, CA, Bakersfield

Project summary

The Project aim. In this project we propose to investigate some radiation effects in inhomogeneous systems. First we plan to consider radiation from a charged particle travelling over a rough surface. In the second part of project we will consider backward transition radiation from a medium with near zero dielectric constant and diffusive radiation from a charged particle moving in an inhomogeneous medium with near zero average dielectric constant. The main goal of this

Project is creation of setups for detection of diffusive radiation from a rough surface in the visible region and transition

radiation from a medium with near zero dielectric permittivity in the THz region.

Current status.

We have theoretically investigated radiation of a charged particle travelling over a rough metallic surface. Numerical estimates show that conditions for diffusional mechanism of radiation are easily fulfilled for single metals like Ag,Al and etc. Transition radiation from a charged particle crossing an interface between vacuum and a medium with near zero dielectric permittivity was considered theoretically. It was shown that radiation intensity in this case essentially exceeds conventional transition radiation intensity from the interface vacuum-metal. As a medium with near zero dielectric constant one can take, for example, weakly doped semiconductor InSb which has near zero dielectric constant in the THz region.

The project’ influence on progress in this area. If the planned experiments within the present project are successful then it will open possibility of having new tools for beam position monitoring in accelerators and new sources in THz region.

The participants’ expertise. The scientists taking part in the project have considerable experience in these field proved by their publications and participation in the international conferences. Project manager Zh.S.Gevorkian has many publications in leading journals on the topic of Project.

Expected results and their application.

  • Registration of Diffusive Radiation(DR) from a rough surface in the visible region
  • Angular and spectral distribution of the intensity of DR and its dependence on roughness of the surface of the target
  • Radiation intensity dependence on energy and current of electrons and the distance of the electron beam from the target.
  • Registration of TR radiation in THz region.
  • Angular distribution of the intensity of the detected radiation.
  • Intensity and angular dependence of the radiation on energy and current of electrons.

Meeting the ISTC goals and objectives. Since former “weapons” scientists took part in this Project implementation and because it is exceptionally peaceful the Project meets the ISTC goals. Adherence to these objectives can be attained by planned wide involvement of scientists and participating institutions into international scientific community through providing information on the Project during international conferences and workshops.

Scope of activities. The following activities will be implemented under the Project:

  • Theoretical investigations of radiation from a correlated rough surface.
  • Modeling and Monte-Carlo simulation.
  • Measurements (experiment 1): TR radiation in far infrared(THz) region.
  • Measurements (experiment 2): Diffusive radiation from a rough surface in visible region.
  • Interpretation of experimental results.
  • Development and creation of a setup of the prototype
  • Research of characteristics of the prototype
  • Results presentation to the international scientific community.

Role of Foreign Collaborators/Partners. Prof. Stepanyan from JLAB, USA express his wish to collaborate with our group on problems of beam diagnostics. He is engaged for many years in analogous activity in JLAB. Prof. Jonassen from Oslo University College will collaborate with us on numerical simulation of radiation processes in random systems.

Technical approach and methodology

Basic elements of experimental installation are the target, a source of electrons and detectors of optical and THz-radiation. A target represents in one case Al, Ag films and in another case a weakly doped semiconductor InSb. An electron gun will be used as a source of the electrons. At processing modern packages will be used. For theoretical calculations we shall use modern methods of theoretical physics.


The International Science and Technology Center (ISTC) is an intergovernmental organization connecting scientists from Kazakhstan, Armenia, Tajikistan, Kyrgyzstan, and Georgia with their peers and research organizations in the EU, Japan, Republic of Korea, Norway and the United States.


ISTC facilitates international science projects and assists the global scientific and business community to source and engage with CIS and Georgian institutes that develop or possess an excellence of scientific know-how.

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