Backward and Sideward Waves of Space Charge in Neutralized Electron Flux

This paper considers thermal neutralized charge electron flux moving through immovable static ion background. A 2-D dispersion equation is derived. The equation describes linear waves of space charge (WSC) in the flux. In the result of the dispersion equation analysis, we proved the existence of the backward and sideward WSCs. Maps on the plane {k
_x
; k
_y
} were calculated and plotted for two values of the electrons drift velocity. The lines on those maps correspond to the direct, sideward, and backward WSCs. Areas of obtuse and acute drift angles are marked out.