Simulation study of energetic ion confinement response to MHD modes in FRC

Energetic ion confinement is studied in the context of a representative prolate field-reversed configuration equilibrium with kinetic parameter S* <10. Test particle simulations are performed following full orbits for thermal and fast ions using the HYM code. Ion confinement is investigated in the presence of a set of the small amplitude global MHD modes, and its dependence on perturbation amplitudes, the excited mode numbers, and the energy of the fast ions is analyzed. The recent results of NSTX-U with high power NBI and the Tri Alpha Energy experiment motivate the work, as in both cases, it is imperative to understand how fast ions resulting from NBI interact with MHD modes.