Neutral-beam-induced alteration in impurity transport

One of the techniques proposed for expelling impurities from plasma is based on the use of the momentum from a neutral beam. The purpose of the present work is to review the experimental results and then set forth an extension of the rotation theory that seems to be able to match the data qualitatively and quantitatively. (This theory contains no free parameters.) As a serendipitous result, this theory, coupled with the neoclassical theory of intrinsic plasma rotation, appears to be able to explain the difference between the long term confinement of injected silicon in Ohmic ISX-B discharges and the much shorter confinement seen in ALCATOR A. (orig./AH)