Current flow in the scrape-off layer is examined in the situation where the divertor plates are subjected to a voltage bias. It is found that the maximum current extracted from the plates, normally the ion saturation current, is enhanced by the effect of the Pfirsch-Schlüter current being in contact with the plates. This renders the control of particle transport at the plasma edge by divertor plate biasing more effective.
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P. B. Parks (1991) studied this question.
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