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Megaelectron volt (MeV) alpha particles will be the main source of plasmaheating in magnetic confinement fusion reactors. Yet, instead of heating fuelions, most of the energy of alpha particles is transferred to electrons.Furthermore, alpha particles can also excite Alfvenic instabilities, previouslyconsidered as detrimental. Contrary to expectations, we demonstrate efficiention heating in the presence of MeV ions and strong fast-ion driven Alfvenicinstabilities in recent experiments on the Joint European Torus (JET). Detailedtransport analysis of these experiments with state-of-the-art modeling toolsexplains the observations. Here we show a novel type of turbulence suppressionand improved energy insulation in plasmas with MeV ions and fully developedAlfvenic activities through a complex multi-scale mechanism that generateslarge-scale zonal flows. This mechanism holds promise for a more economicaloperation of fusion reactors with dominant alpha particle heating and,ultimately, cheaper fusion electricity

Towards enhanced performance in fusion plasmas via turbulence suppression by MeV ions