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This Letter describes a new parametric instability mechanism caused by a distribution f_{T} of particles trapped in the potential wells of a wave train. The mechanism explains a nonlinear instability in Trivelpiece-Gould (TG) waves, and it could also be a destabilizing factor in a range of nearly collisionless nonlinear plasma waves. The theory is compared to particle in cell simulations of TG waves.

Parametric Instability Driven by Weakly Trapped Particles in Nonlinear Plasma Waves