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We report on a theoretical discovery of new regimes of Alfv\'en eigenmode(AE) induced fast ion transport in tokamak plasmas, where microturbulence playsthe role of a mediator of fast ion relaxation. Coulomb collisional scatteringalone leads to small AE amplitudes and does not reproduce the steady stateregimes observed in experiments. We show that in nonlinear regimes theeffective pitch angle scattering due to microturbulence can lead to steadystate AE amplitude evolution. This indicates a new route for fast ion losses,which is beyond the scenarios described in "Energetic ion transport bymicroturbulence is insignificant in tokamaks" [D. C. Pace et al., Phys. Plasmas20 (2013) 056108]. As a result, microturbulence can significantly increase theamplitude of AEs in predictive simulations of burning plasma experiments suchas ITER.

Microturbulence-mediated route for energetic ion transport and Alfv\'enic mode intermittency in tokamaks