  To rigorously model fast ions in fusion plasmas, a non-Maxwellian equilibrium
distribution must be used. In the work, the response of high-energy alpha
particles to electrostatic turbulence has been analyzed for several different
tokamak parameters. Our results are consistent with known scalings and
experimental evidence that alpha particles are generally well-confined: on the
order of several seconds. It is also confirmed that the effect of alphas on the
turbulence is negligible at realistically low concentrations, consistent with
linear theory. It is demonstrated that the usual practice of using a
high-temperature Maxwellian gives incorrect estimates for the radial alpha
particle flux, and a method of correcting it is provided. Furthermore, we see
that the timescales associated with collisions and transport compete at
moderate energies, calling into question the assumption that alpha particles
remain confined to a flux surface that is used in the derivation of the
slowing-down distribution.
