  The radiation resulting from the uniform motion of a charged particle near a
hemispheric bulge in a metal plane is considered. The description of the
radiation process based on the method of images is developed for the case of
non-relativistic particle and perfectly conducting target. The spectral-angular
and spectral densities of the diffraction radiation on the single bulge (as
well as the Smith-Purcell radiation on the periodic string of bulges) are
computed. The possibility of application of the developed approach to the case
of relativistic incident particle is discussed.
