MHD and resonant instabilities in JT-60SA during current ramp-up with off-axis N-NB injection

The MHD-kinetic hybrid code MEGA is used to analyze the stability of beam-driven JT-60SA ramp-up plasmas with respect to nonresonant and resonant instabilities. Mode structures, growth rates, saturation levels and modifications of the plasma profiles are computed for several cases. The observations are interpreted using MHD stability criteria and orbit-based resonance analysis. It is concluded that the integrated code TOPICS-BAFP should include a model for multiple tearing modes, since these have the largest effect in our simulations.3rd UNIST-Kyoto Univ. Workshop on “Physics validation and control of turbulent transport and MHD in fusion plasmas