Abstract
Abstract The effects of the ergodic magnetic limiter (EML) on edge modification, hydrogen recycling and impurity behavior are investigated in the HYBTOK-II tokamak. A plasma modification at the edge with the EML is confirmed by measuring the edge plasma parameters. An enhancement of recycling with the EML is demonstrated using computed tomography. Emissions from metal ions were reduced, while those from metal atoms and light impurities were increased with the EML. The reasons of this different effect on impurity behavior are discussed, based on an impurity control modeling in the EML, the magnetic field structure and a simple calculation on the penetration of neutral atoms into plasma.
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