Speaker
Description
Transition radiation detectors is one of the not destructive particle Identification techniques widely used in high energy and cosmic-ray physics.
The change of the electromagnetic field of a charged particle at a transition between media with different refractive indices leads to the emission of electromagnetic radiation, so-called transition radiation (TR). In the optical range transition radiation is emitted in the forward and backward directions and it is used usually for a beam position diagnostics in accelerators. However, in the keV energy range TR is emitted at small angles to the particle and its yield has sort of threshold effect as a function of a particle Lorentz factor. This effect used in the transition radiation detectors (TRD) to separate particles of the same momentum which have different masses.
In this talk I’ll present a basic properties of the transition radiation starting from the TR characteristics at a singe transition boundary then going to interference phenomena and their dependence on the coherence conditions leading to evolution of the angular and the energy TR spectra. Dependence of these characteristics on the Lorentz factor will be discussed. Then basic principles of the TRD operation will be presented with examples of their use in the high energy and cosmic-ray experiments. Finally, new TRD developments and trends with be presented and discussed.
