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Bootstrap Current Generated by Alpha Particles

The expression for the bootstrap current density due to fusion-produced alpha particles is derived in an axisymmetric plasma by solving a drift kinetic equation in the presence of both drag and pitch-angle scattering. From this expression the alpha-particle induced bootstrap current for a D-T plasma is explicitly evaluated in a tokamak with circular cross-section. The evaluated results show that the ratio of this bootstrap current to that due to bulk particles does not become a large value for burning plasmas presently considered. However, the use of this bootstrap current for current profile control and a seed current for a steady-state tokamak may be possible.