Reduced-MHD Simulations of Toroidally and Poloidally Localized ELMs

Details Reduced-MHD Simulations of Toroidally and Poloidally Localized ELMs Reduced-MHD Simulations of Toroidally and Poloidally Localized ELMs

2012-01-27

arxiv.org/abs/1201.5765v2

Physics

Plasma Physics

submitted to Physics of Plasmas, revised version

Scientific paper

We use the non-linear reduced-MHD code JOREK to study ELMs in the geometry of the ASDEX Upgrade tokamak. Toroidal mode numbers, poloidal filament sizes, and radial propagation speeds of filaments into the scrape-off layer are in good agreement with observations for type-I ELMs in ASDEX Upgrade. The observed instabilities exhibit a localization of perturbations which is compatible with the "solitary magnetic perturbations" recently discovered in ASDEX Upgrade [R.Wenninger et.al., Solitary Magnetic Perturbations at the ELM Onset, Nucl.Fusion, submitted]. This localization can only be described in numerical simulations with high toroidal resolution.

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