Deformation of Weakly Unstable Density Distribution of Non-Neutral Plasma Stimulated by Resonant Clumps

Accelerated deformations are observed in the density distribution of a pure electron plasma that is weakly diocotron-unstable when l clumps are introduced along a circle where the rotation frequency advected by the target plasma is close to the phase-rotation frequency of an unstable wave with the mode number of l. When the advection frequency is not close to the phase frequency, the clumps are modified in their orbit by the most unstable wave of the target plasma and bunched azimuthally into the distribution modulated by the wave.