Abstract
The distribution of metal impurities on the surface of the graphite limiters in JET after exposure to discharges in the operational periods 1983, 1984 and 1985 have been examined. A simple model for erosion and redeposition is proposed which is in broad agreement with the observed distributions. It is concluded that impurity deposition on the limiter from all sources is rapidly eroded and redeposited on the limiter surface during normal tokamak discharges so that the final distribution is dominated by this mechanism. Mechanisms are also identified for net removal of material from the limiter.
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