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The nonlinear three-wave interaction process at the heart of the parametricdecay process is studied by launching counter-propagating Alfv\'en waves fromantennas placed at either end of the Large Plasma Device (LAPD). A resonance inthe beat wave response produced by the two launched Alfv\'en waves is observedand is identified as a damped ion acoustic mode based on the measureddispersion relation. Other properties of the interaction including the spatialprofile of the beat mode and response amplitude are also consistent withtheoretical predictions for a three-wave interaction driven by a non-linearpondermotive force.

Nonlinear excitation of acoustic modes by large amplitude Alfv\'en waves in a laboratory plasma