Evaluation of the slowing down tail enhanced, neoclassical alpha particle energy flux

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Abstract
The non-Maxwellian slowing down tail formed by the energetic alpha particles produced in a fusing tokamak is shown to substantially enhance the neoclassical radial energy loss of alphas. The retention of the pitch angle scattering of the energetic tail alphas by the background ions leads to a neoclassical energy flux that can easily become larger than that of the alpha ash. The enhanced flux can also act to prevent the fusion alpha power from being deposited in the background plasma unless the banana width is sufficiently small.