Mechanisms of submillimeter wave generation by kiloampere REB in a plasma column with strong density gradients

Project of powerful submillimeter wave generator based on intense interaction of a relativistic electron beam with a magnetized plasma is developed at BINP RAS in collaboration with NSU. In presented experiments, the beam with parameters 0.8 MeV/15 kA/6 μs is injected into a plasma column with the density ~10
¹⁵
cm
^-3
. Spectral composition of the emission from the plasma column is studied in the frequency band 0.1 - 1 THz. In the analysis of the results of our studies we focus on the role of strong plasma density gradients in generation of sub-mm waves.