The viscosity-driven impurity transport in a stellarator in the 1/ν and collisionless detrapping regimes is calculated. It is found that the impurity flux tends to go inward radially if all the species are in the 1/ν regime and tends to go outward if all the species are in the collisionless detrapping regime.
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K. C. Shaing (1983) studied this question.
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