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Updated: Nov 1, 2025

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Global Theory of Microtearing Modes in the Tokamak Pedestal
J L Larakers1, M Curie1, D R Hatch1
1Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
Abstract:
The pedestal of H-mode tokamaks displays strong magnetic fluctuations correlated with the evolution of the electron temperature. The microtearing mode (MTM), a temperature-gradient-driven instability that alters magnetic topology, is compatible with these observations. Here we extend the conventional theory of the MTM to include the global variation of the temperature and density profiles. The offset between the rational surface and the location of the pressure gradient maximum (μ) emerges as a crucial parameter for MTM stability. The extended theory matches observations on the Joint European Torus tokamak.
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