Model for screening of resonant magnetic perturbations by plasma in a realistic tokamak geometry and its impact on divertor strike points

Abstract

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.

arXiv commentAccepted in the Proceedings of the 19th International Conference on Plasma Surface Interactions, to be published in Journal of Nuclear Materials. Version 2: minor formatting and text improvements, more results mentioned in the conclusion and abstract

References in corpus (1)

• Resonant magnetic perturbations and divertor footprints in poloidally diverted tokamaks

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• Modeling non-stationary, non-axisymmetric heat patterns in DIII-D tokamak
• Nuclear Fusion: Bringing a star down to Earth
• Comparison of plasma response models for RMP effects on the divertor and scrape-off layer in KSTAR