Comparison of MCGO with CQL3D-FOW for alpha-particle neoclassical effects

The 6D (optionally 5D) Monte-Carlo code MCGO [1] has been upgraded to include alpha-particle sources. The alphas can be followed until their thermalization or loss under collisions and RF heating. A particular interest is neoclassical effects, such as the bootstrap current from alphas. We compare MCGO modeling with previous results obtained with the bounce-average finite difference Fokker-Planck code CQL3D-FOW [2,3]. MCGO results verify the shape of the steady-state velocity distributions of alphas, including some features related to the loss cone and radial transport. Also, the radial profile of bootstrap current density is confirmed, including an unusual peak at the plasma center.