Abstract
The neoclassical transport coefficients for the radial particle and energy fluxes, and the parallel current of the fusion-produced alpha particles are shown to be expressed analytically by using a variational method and a Padé approximation.The analytic expressions for these transport coefficients can be used for a wide range of parameters in an axisymmetric magnetic field. The explicit calculation in a tokamak with circular cross section shows that the analytic expressions give a quite good approximation to the numerically calculated exact ones for vc / vα > 0.2 -- 0.3, where vc and vα are the critical velocity and the birth velocity, respectively.
