Abstract
A set of zero dimensional recycling equations is used to compute the hydrogen particle flux on to the walls and limiters in a tokamak. This particle flux acts as a source term for the desorption of light impurities and the sputtering of heavy metallic impurities. The resultant set of differential equations is solved to give impurity influxes and concentrations and compared with experimental results. Impurity production is predominantly due to the charge exchange neutral flux. As a consequence impurity levels are insensitive to the divertor exhaust efficiency, but are dependent on the impurity screening efficiency.
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