Co-simulation for plasma profile formation coupled with modulated heating and magnetic field

Abstract A global transport simulation, AGITO, which employs direct coupling between local gyrokinetic turbulent transport and global profile formation solvers, has been developed. The implementation of a simplified turbulent transport model in the code enables new transport analyses that account for both heating and magnetic field modulations. In the simulations demonstrating these modulations, a time–delayed response of turbulent transport to heating modulation was observed, with the time delay increasing in the inner core region. Furthermore, magnetic field modulation induced qualitative changes in the nonlinear response of turbulent transport through the generation of zonal flows. These numerical results suggest that magnetic field modulation can nonlinearly alter the confinement state.