Abstract
Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal Alfvén eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution. The EP-driven TAE has a radial mode width much smaller than that predicted by the magnetohydrodynamic theory. The TAE radial position stays around the strongest EP pressure gradients when the EP profile evolves. The nonperturbative EP contribution is also the main cause for the breaking of the radial symmetry of the ballooning mode structure and for the dependence of the TAE frequency on the toroidal mode number. These phenomena are beyond the picture of the conventional magnetohydrodynamic theory.
Highlights
Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal Alfven eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution
The toroidal Alfven eigenmode (TAE) with radially extended structures can be driven unstable by pressure gradients of energetic particles (EPs) produced by fusion reactions and auxiliary heating [2]
In the well-accepted and widely exercised paradigm, the growth rate of the Alfven eigenmodes can be calculated from a perturbative EP contribution to a fixed mode structure and real frequency given by magnetohydradynamic (MHD) properties of thermal plasmas
Summary
Linear gyrokinetic simulation of fusion plasmas finds a radial localization of the toroidal Alfven eigenmodes (TAEs) due to the nonperturbative energetic particle (EP) contribution. The gyrokinetic toroidal code (GTC) [22,23,24] is used to simulate self-consistently the TAE mode structure and dispersion relation with realistic parameters of fusion plasmas. GTC linear simulation of the DIII-D tokamak experiment [6] finds a radial localization of the TAE due to the nonperturbative EP contribution.
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