Enhanced performance in fusion plasmas through turbulence suppression by megaelectronvolt ions

Alpha particles with energies on the order of megaelectronvolts will be main source plasma heating in future magnetic confinement fusion reactors. Instead fuel ions, most energy alpha is transferred to electrons plasma. Furthermore, can also excite Alfvénic instabilities, which were previously considered detrimental performance device. Here we report improved thermal ion presence ions and strong fast ion-driven instabilities recent experiments Joint European Torus. Detailed transport analysis these reveals turbulence suppression through a complex multi-scale mechanism that generates large-scale zonal flows. This holds promise for more economical operation reactors dominant particle ultimately cheaper electricity. Experiments at Torus tokamak show highly energetic