Multi-scale interactions between turbulence and magnetohydrodynamic instability driven by energetic particles

Abstract In order to realize high performance burning plasmas in magnetic-confinement fusion devices, such as tokamaks, both bulk plasma transport and that of energetic alpha-particles, which result from different scale fluctuations with free energy sources, have be reduced simultaneously. Utilizing the advantage global toroidal non-linear simulations covering a whole torus, here, we found new coupling mechanism between low-frequency micro-scale electromagnetic drift-wave regulating former, while high-frequency macro-scale Alfven eigenmode (TAE) regulates latter. This results dual spread turbulence due TAE not only wavenumber space representing local eddy size but also configuration profile variations. Consequently, class turbulent state is established, where homogenized on poloidal cross-section exhibiting large-scale structure, increases fluctuation levels then transports, leading deterioration performance.