NEOCLASSICAL TRANSPORT IN A ROTATING IMPURE PLASMA

In a toroidally rotating tokamak plasma, heavy impurity ions accumulat e on the outside of each flux surface under the action of the centrifu gal force. The collision frequency therefore varies over the flux surf ace. This circumstance is shown to enhance the neoclassical transport processes, including the bootstrap current, by making collisions occur preferentially where the magnetic field is weak. (C) 1998 American In stitute of Physics.