Drift pumping of tandem mirror thermal barriers

Drift pumping is a means of selectively removing low energy ions from the thermal barrier of a tandem mirror by induced radial transport. The paper determines the conditions for, and the properties of, transport induced by externally applied low frequency waves resonating with the trapped-ion azimuthal drift frequency. Considerations that are discussed include conditions necessary for stochasticity, derivation of the local diffusion coefficient, and computation of the perturbed fields throughout the plasma for a model based on TMX-U profiles with and without a throttle-coil geometry. (author)