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Alfv\'enic modes in the current quench (CQ) stage of the tokamak disruptionhave been observed in experiments. In DIII-D the excitation of these modes isassociated with the presence of high-energy runaway electrons, and a strongmode excitation is often associated with the failure of RE plateau formation.In this work we present results of self-consistent kinetic-MHD simulations ofRE-driven compressional Alfv\'en eigenmodes (CAEs) in DIII-D disruptionscenarios, providing an explanation of the CQ modes. Simulation results revealthat high energy trapped REs can have resonance with the Alfv\'en mode throughtheir precession motion, and the resonance frequency is proportional to theenergy of REs. The mode frequencies and their relationship with the RE energyare consistent with experimental observation. The perturbed magnetic fieldsfrom the modes can lead to spatial diffusion of runaway electrons including thenonresonant passing ones, thus providing the theoretical basis for a potentialapproach for runaway electron mitigation.

Self-consistent simulation of compressional Alfv\'en eigenmodes excited by runaway electrons