Energy Distribution of the Relativistic Electron Beam after Beam-Plasma Interaction Resulting in THz Radiation Emission

Experiments on pulse generation of submm electromagnetic waves are carried out at GOL-PET facility in Budker Institute of Nuclear Physics. The generation is realized in the process of relativistic electron beam interaction with a plasma column. Recently, the experiments have demonstrated the multi-megawatt power generation of 1 mm wavelength radiation at pulse duration up to 3 µs [1] . Evolution of the energy distribution function of the beam electrons as a result of the beam-plasma interaction is very important characteristic of this process. Firstly, measuring this function permits to evaluate the efficiency of the beam energy deposition in plasma. Secondly, analyzing the evolution of the function in correlation with the time behavior of the power and the spectral composition of the radiation outgoing from the plasma column during the E-beam pulse at various experimental conditions allows one to understand the physics mechanism of the wave generation.