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

Plasma, Fusione Fusion energy Plasma Àrees temàtiques de la UPC::Física SDG 7 - Affordable and Clean Energy 530 Fusion, Plasma and Space Physics Tokamaks Magnetic perturbations
DOI: 10.1038/s41567-024-02666-y Publication Date: 2024-10-28T11:04:59Z
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ABSTRACT
Abstract In tokamaks, a leading platform for fusion energy, periodic filamentary plasma eruptions known as edge-localized modes occur in plasmas with high-energy confinement and steep pressure profiles at the edge. These could damage tokamak wall but can be suppressed using small three-dimensional magnetic perturbations. Here we demonstrate that these perturbations change topology just inside gradient region of We identify signatures island, their observation is linked to suppression modes. compare high-resolution measurements perturbed surfaces predictions from ideal magnetohydrodynamic theory where preserved. Although magnetohydrodynamics adequately describes exhibiting modes, it proves insufficient are suppressed. Nonlinear resistive modelling supports this observation. Our study experimentally confirms predicted role islands inhibiting occurrence This will beneficial physics-based future devices control
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