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Neutral-hydrogen-beam injection parallel to the plasma current (co-injection) has been observed to produce smaller concentrations of both naturally occurring and injected impurities than counter-injection. We explain this result by considering the effect of plasma rotation on radial impurity transport. This rotation effect could be the basis of an impurity-control technique for tokamak fusion reactors.
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Burrell et al. (1981) studied this question.
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