Skobeltsyn Institute of Nuclear Physics
Lomonosov Moscow State University

We describe method of the charged particle beam energy spectrum
determination using Vavilov-Cherenkov radiation in RF wavelength range. Radiation is
generated in the dielectric filled circular waveguide with vacuum channel on axis along
which beam is moving. With this non-invasive method compact and cheap device for
beam energy spectrum control in the energy range 1-15 MeV can be built.