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A general theoretical framework for investigating nonlinear dynamics of phasespace zonal structures is presented in this work. It is then, morespecifically, applied to the limit where the nonlinear evolution time scale issmaller or comparable to the wave-particle trapping period. In this limit, boththeoretical and numerical simulation studies show that non-adiabatic frequencychirping and phase locking could lead to secular resonant particle transport onmeso- or macro-scales. The interplay between mode structures and resonantparticles then provides the crucial ingredient to properly understand andanalyze the nonlinear dynamics of Alfv\'en wave instabilities excited bynon-perturbative energetic particles in burning fusion plasmas. Analogies withautoresonance in nonlinear dynamics and with superradiance in free electronlasers are also briefly discussed.

Nonlinear dynamics of phase space zonal structures and energetic particle physics in fusion plasmas