Evaluating alpha particle redistribution resulting from Alfven eigenmodes using SPIRAL

Fusion alpha particles in SPARC are redistributed radially due to toroidal Alfven eigenmode (TAEs) even if they are not lost. Alpha particles are necessary to heat the plasma core and maintain the fusion reaction. TAEs can remove the alpha particles from the core before they transfer their energy to the thermal plasma[AL1] . A standard SPARC equilibrium of 12.2T and 8.7MA was used in the full orbit following SPIRAL code. The alpha particle birth profile was generated using TRANSP in predative mode and the TAE radial structure was calculated from NOVA with a user supplied amplitude. The alpha particles were followed to slow-down time without and with TAEs. Alpha particle redistributions were observed and compared to calculations done in the ASCOT code, as well as the local energy deposited by particles.