Observation of Reversed Shear Alfvén Eigenmodes between Sawtooth Crashes in the Alcator C-Mod Tokamak
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Edlund-2009-Observation of Rever.pdf
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Author(s)
Kramer, G. J.
Wukitch, Stephen James
Porkolab, Miklos
Lin, Yijun
Lin, Liang
Edlund, Eric Matthias
Date Issued
April 2009
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Edlund, E. M. et al. “Observation of Reversed Shear Alfvén Eigenmodes between Sawtooth Crashes in the Alcator C-Mod Tokamak.” Physical Review Letters 102.16 (2009): 165003. © 2009 The American Physical Society.
Version
Final published version
Abstract
Groups of frequency chirping modes observed between sawtooth crashes in the Alcator C-Mod
tokamak are interpreted as reversed shear Alfve´n eigenmodes near the q ¼ 1 surface. These modes
indicate that a reversed shear q profile is generated during the relaxation phase of the sawtooth cycle. Two
important parameters, qmin and its radial position, are deduced from comparisons of measured density
fluctuations with calculations from the ideal MHD
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
http://dx.doi.org/10.1103/PhysRevLett.102.165003
