Extended MHD Simulations of Internal Kink and Alfven Waves in ITER

The n=1 internal kink mode and fishbone instability are investigated using the multi-level 3D extended MHD code M3D. The M3D contains multi-levels of physics including ideal MHD, resistive MHD, two fluids, and particle-closure for both thermal ion and energetic particle stress tensor. Our models include the physics of alpha particle stabilization of internal kink mode, alpha particle's resonant destabiliztion of fishbone instability and Alfven Eigenmodes, the effects of diamagnetic drift of thermal ions and the stabilizing effects of trapped thermal ions. Extensive simulations have been carried out for ITER parameters and profiles. It is found that the elongation of the ITER cross-section reduces the alpha particle stabilization significantly. The fishbone mode is found to be stable at the nominal ITER alpha beta. The effects of thermal ion's non-adiabatic response are strongly stabilizing for internal kink mode. The thermal ion's diamagnetic drift is expected to have a stabilizing effect on the kink mode. Details of these results and nonlinear simulations will be presented. (author)