Abstract
Abstract
We investigate the Cherenkov radiation by a charge uniformly moving inside a dielectric
cylindrical channel in a homogeneous medium. The expressions for the Fourier components of the
electric and magnetic fields are derived by using the electromagnetic field Green tensor. The
spectral distribution of the Cherenkov radiation intensity in the exterior medium is studied for
the general case of frequency dispersion of the interior and exterior dielectric functions. It is
shown that, under certain conditions on the dielectric permittivities, strong narrow peaks appear
in the spectral distribution. The spectral locations of those peaks are specified and their
heights and widths are estimated analytically on the base of the dispersion equation for the
electromagnetic eigenmodes of the cylinder.