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Abstract: A new technique for manipulation and control of gradient-driven instabilitiesthrough nonlinear interaction with Alfv\-en waves in a laboratory plasma ispresented. A narrow field-aligned density depletion is created in the LargePlasma Device LAPD, resulting in coherent unstable fluctuations on theperiphery of the depletion. Two independent kinetic Alfv\-en waves are launchedalong the depletion at separate frequencies, creating a nonlinear beat-waveresponse at or near the frequency of the original instability. When thebeat-wave has sufficient amplitude, the original unstable mode is suppressed,leaving only the beat-wave response at a different frequency, generally atlower amplitude.



Author: D.W. Auerbach, T.A. Carter, S. Vincena, P. Popovich

Source: https://arxiv.org/



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