Abstract
We show the existence of a new instability mechanism of a current-carrying plasma, which, for a sufficiently long system, may occur after saturation of the two-stream instability. The instability is due to combined asymmetry and nonuniformity of the electron distribution and is manifested by the spontaneous appearance of a growing, localized Langmuir oscillation at approximately the position vd = vt. A possible connection with the formation of double layers is pointed out.
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