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Effect of Pitch-Angle Scattering on the Alpha-Particle Bootstrap Current in the Near-Axis Region of the Tokamak

1994; American Nuclear Society; Volume: 25; Issue: 3 Linguagem: Inglês

10.13182/fst94-a30281

0748-1896

V.Ya. Goloborod'ko, Ya. I. Kolesnichenko, S. N. Reznik, V.A. Yavorskij,

Ionosphere and magnetosphere dynamics

A kinetic equation is derived for the neoclassical distribution function of alpha particles with orbits intersecting or approaching the magnetic axis of a tokamak. This equation takes into account both the collisional slowing down and the pitch-angle scattering of alpha particles. An equation with a simplified pitchangle scattering term is solved analytically, and the distribution function obtained is used to find the alpha-particle bootstrap current at the magnetic axis. It is shown that the pitch-angle scattering leads to an alpha-particle current in the near-axis region that is larger than the one predicted from early neoclassical theory, which allows only for the slowing down of alpha particles.