Physics

Observation of magnetic islands in tokamak plasmas during the suppression of edge-localized modes

M. Willensdorfer, V. Mitterauer, et al.

Discover how cutting-edge research conducted by Matthias Willensdorfer and colleagues unveils the mechanism behind edge-localized modes (ELMs) suppression in tokamaks. This groundbreaking study reveals that three-dimensional magnetic perturbations can create magnetic islands, providing new insights for future fusion energy predictions.

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Abstract

Edge-localized modes (ELMs), periodic plasma eruptions in tokamaks, can damage the tokamak wall. This study demonstrates that three-dimensional magnetic perturbations (RMPs) suppress ELMs by altering the magnetic topology near the plasma edge, creating magnetic islands. High-resolution measurements and MHD modelling confirm that ideal MHD is insufficient to describe ELM-suppressed plasmas, while nonlinear resistive MHD modelling supports the magnetic island hypothesis as the mechanism for ELM suppression. This finding is crucial for physics-based predictions in future fusion devices.

Publisher

Nature Physics

Published On

Dec 28, 2024

Authors

Matthias Willensdorfer, Verena Mitterauer, Matthias Hoelzl, Wolfgang Suttrop, Mark Cianciosa, Mike Dunne, Rainer Fischer, Nils Leuthold, Jonas Puchmayr, Oleg Samoylov, Guillermo Suárez López, Daniel Wendler

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