Ripple induced diffusion of fast ions in tokamaks with elliptic cross section

The fast ion diffusion caused by the toroidal magnetic fieldripple in tokamaks with the elliptic cross-sections is shown to affect the stochasticity condition of the particle collisionless motion increasing the ripple characteristic value. The elongation also leads to the decrease of the diffusion coefficient in both the regime of intrinsic stochasticity and the various collisional stochasticity regimes. Moreover, it is shown that in the elliptic tokamak the energy range with regime of weak collisions becomes smallwe but the range or ripple-plateau regime becomes larger. The space distribution of the fast ion flux on the first wall is considered. 11 refs