Physics – Plasma Physics
Scientific paper
2010-12-17
Physics
Plasma Physics
Accepted in the Proceedings of the 19th International Conference on Plasma Surface Interactions, to be published in Journal of
Scientific paper
This work addresses the question of the relation between strike-point splitting and magnetic stochasticity at the edge of a poloidally diverted tokamak in the presence of externally imposed magnetic perturbations. More specifically, ad-hoc helical current sheets are introduced in order to mimic a hypothetical screening of the external resonant magnetic perturbations by the plasma. These current sheets, which suppress magnetic islands, are found to reduce the amount of splitting expected at the target, which suggests that screening effects should be observable experimentally. Multiple screening current sheets reinforce each other, i.e. less current relative to the case of only one current sheet is required to screen the perturbation.
Cahyna Pavel
Nardon Eric
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