The radiation spectra of electrons moving in a spiral in magnetic fields in media

Integral expressions for spectral distributions of the radiation power for system of electrons moving in a spiral in magnetic fields in isotropic transparent media are investigated using the Lorentz's self-interaction method. Special attention is given to the research of the fine structure of the synchrotron radiation spectral distribution of two electrons moving in a spiral in medium in relativistic case. The spectra of synchrotron, Cherenkov and synchrotron-Cherenkov radiations for a single electron are analyzed