Model for Screening of Resonant Magnetic Perturbations by Plasma in a Realistic Tokamak Geometry and its Impact on Divertor Strike Points

This work addresses the question of the relation between strike-point splitting and magnetic stochasticity at the edge of a poloidally diverted tokamak in 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 at the same time the amount of splitting expected at the target, which suggests that screening effects should be observable experimentally.
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