Collective interaction of monoenergetic relativistic high-energy electron beams with plasma

Results of the experimental and theoretical investigations of the interactions of modulated relativistic electron beams (REB) with plasma and monoenergetic REB with dense plasma are presented. Coherent energy losses of modulated relativistic beam and excitation of collective oscillations in plasma by the beam conditioned by the Vavilov-Cherenkov effect are revealed. It is shown that the efficiency of the interaction of monoenergetic REB with low angular divergence with the plasma does not decrease as plasma density grows.