Reduced-MHD Simulations of Toroidally and Poloidally Localized ELMs

Abstract

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.

accepted for publication in Physics of Plasmas

References in corpus (1)

• Solitary magnetic perturbations at the ELM onset

Cited by in corpus (8)

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• Nonlinear excitation of low-n harmonics in reduced magnetohydrodynamic simulations of edge-localized modes
• Solitary magnetic perturbations at the ELM onset
• Comparing spontaneous and pellet-triggered ELMs via non-linear extended MHD simulations
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• Numerical study of tearing mode seeding in tokamak X-point plasma
• Streamline integration as a method for structured grid generation in X-point geometry
• Modelling of saturated external MHD instabilities in tokamaks: a comparison of 3D free boundary equilibria and nonlinear stability calculations