BEAM-PLASMA STRUCTURES AT PROPAGATION OF ELECTRON-BEAMS IN PLASMA

In the frame of the theory of weak turbulence the propagation of elect ron beams is considered. Using the smallness of quasilinear time trans ition from kinetic equations to gas-dynamic ones has been done. The ob tained gas-dynamic equations are solved for one, two and N monoenerget ic beams. It is shown that each beam generally propagates as a beam-pl asma structure consisting of electrons and Langmuir waves. Interaction of the structures at their propagation leads to electron exchange and spatial shape changing. Different situations are discussed in depende nce on initial beam velocities and densities.