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In an initially uniform plasma, the lifetime of a weakly nonlinear plasmawave excited by a short driver is limited by the ion dynamics. The wakefieldcontains a slowly varying radial component, which results in a perturbation ofthe ion density profile and consequent destruction of the plasma wave. Wesuggest a novel method of characterizing the wave lifetime in numericalsimulations quantitatively and study how the lifetime scales with the ion mass.We also discuss the implications of the limited lifetime on a recently proposedmethod of generating high-power terahertz radiation with counterpropagatingwakefields driven by colliding laser pulses.

Dissipation of weakly nonlinear wakefields due to ion motion