Diffraction radiation of ultrarelativistic particles during the flight through an inclined slit

The paper proposes to use diffraction radiation (DR) of relativistic particles in the flight through an inclined slit for non-disturbing diagnostics of particle beams. For ultrarelativistic particles (γ >> 1, γ is the Lorentz factor) one derived simple expressions for DR intensity for an inclined slit within the perfectly conducting plane and showed, that total losses by radiation were proportional to γ. One followed the effect of the initial divergence of particle beam for the form of the angular distribution of DR and showed the theoretical possibility to determine beam divergence that was smaller that γ-1 when measuring of DR angular distribution with the wave fixed length