Role of wave-particle resonance in turbulent transport in toroidal plasmas

TL;DR

This paper investigates how wave-particle resonance influences turbulent transport in tokamak plasmas, revealing that electron transport is mainly governed by linear resonance while ion transport involves nonlinear effects, using gyrokinetic simulations.

Contribution

It provides the first detailed simulation-based analysis distinguishing linear and nonlinear wave-particle resonance effects on electron and ion transport in tokamak turbulence.

Findings

Electron transport is primarily regulated by linear wave-particle resonance.

Ion transport is mainly influenced by nonlinear wave-particle decorrelation.

Simulation results confirm the different roles of resonance in electron and ion transport.

Abstract

Wave-particle interaction in toroidal plasmas is an essential transport mechanism in drift wave instability-driven microturbulence. In tokamkas, different wave-particle resonance conditions have been found important for the energy and particle transport of multiple species in various drift wave turbulences. To confirm the transport mechanism for electrons and ions in tokamak drift-wave instabilities, the effect of wave-particle resonance on turbulent transport is studied using global gyrokinetic particle simulations of the plasma core ion temperature gradient (ITG) and collisionless trapped electron mode (CTEM) turbulence. Simulation results show that in CTEM and ITG turbulence, electron transport is primarily regulated by wave-particle linear resonance, and the ion transport is regulated by nonlinear wave-particle decorrelation.