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A novel channel for fuel ions heating in tokamak core plasma is proposed andanalyzed using nonlinear gyrokinetic theory. The channel is achieved viaspontaneous decay of reversed shear Alfv\'en eigenmode (RSAE) into lowfrequency Alfv\'en modes (LFAM), which then heat fuel ions via collisionlession Landau damping. The conditions for RSAE spontaneous decay are investigated,and the saturation level and the consequent fuel ion heating rate are alsoderived. The channel is expected to be crucial for future reactors operatingunder reversed shear configurations, where fusion alpha particles are generatedin the tokamak core where the magnetic shear is typically reversed, and thereis a dense RSAE spectrum due to the small alpha particle characteristicdimensionless orbits.

Core localized alpha-channeling via low frequency Alfven mode generation in reversed shear scenarios