Excitation of oscillations in an inhomogeneous plasma by an electron beam

Oscillations in the one-dimensional system of an electron beam-inhomogeneous plasma are theoretically treated. A general approach to the analysis of oscillations in the plasma-beam system is discussed for the case of a significantly changing plasma density along the beam axis. A case of the linear increase in plasma density is considered. The possibility of excitation of oscillations special type having no analog in a homogeneous medium is shown