A new method is described for inducing energy-selective transport by 'sweeping' the frequency of applied low n magnetic perturbations. The mechanism, formally analogous to the 'rising buckets' concept in accelerator physics, can move particles with a selected velocity in a non-diffusive fashion from one specified radius to another. The technique is considered principally as a means for removal of helium ash. Other likely applications are as a method for burn control, profile control, as a diagnostic and perhaps as a nonstochastic means of effecting the direct coupling of alpha power recently discussed by Fisch and Rax (1992)