Transition and Diffraction Radiation
Transition radiation occurs when a moving charged particle crosses a boundary between two media with different electrodynamic properties. In its simplest form, which is commonly used in experiments, transition radiation is generated by sending a beam through a metallic foil. In this chapter, we will derive the spectrum and angular distribution of the transition radiation when a particle crosses a foil at normal incidence. We will also discuss radiation generated by the beam when it passes through a hole in a metal foil — the so-called diffraction radiation.
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