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Updated: Jun 22, 2026

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Observation of reversed shear Alfvén eigenmodes between sawtooth crashes in the Alcator C-Mod tokamak
E M Edlund1, M Porkolab, G J Kramer
1MIT Plasma Science and Fusion Center, Cambridge, Massachusetts 02139, USA.
Abstract:
Groups of frequency chirping modes observed between sawtooth crashes in the Alcator C-Mod tokamak are interpreted as reversed shear Alfvén eigenmodes near the q=1 surface. These modes indicate that a reversed shear q profile is generated during the relaxation phase of the sawtooth cycle. Two important parameters, q_{min} and its radial position, are deduced from comparisons of measured density fluctuations with calculations from the ideal MHD code NOVA. These studies provide valuable constraints for further modeling of the sawtooth cycle.
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