Phase contrast imaging measurements of reversed shear Alfven eigenmodes during sawteeth in Alcator C-Mod
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Author(s)
Edlund, Eric Matthias
Porkolab, Miklos
Kramer, G. J.
Lin, Liang
Lin, Yijun
Wukitch, Stephen James
Date Issued
March 2009
Journal
Physics of Plasmas
Publisher
American Institute of Physics
Citation
Edlund, E. M. et al. “Phase contrast imaging measurements of reversed shear Alfv[e-acute]n eigenmodes during sawteeth in Alcator C-Mod.” Physics of Plasmas 16.5 (2009): 056106-8. ©2009 American Institute of Physics.
Version
Final published version
Abstract
Reversed shear Alfvén eigenmodes (RSAEs) have been observed with the phase contrast imaging diagnostic and Mirnov coils during the sawtooth cycle in Alcator C-mod [M. Greenwald et al., Nucl. Fusion 45, S109 (2005)] plasmas with minority ion-cyclotron resonance heating. Both down-chirping RSAEs and up-chirping RSAEs have been observed during the sawtooth cycle. Experimental measurements of the spatial structure of the RSAEs are compared to theoretical models based on the code NOVA [C. Z. Cheng and M. S. Chance, J. Comput. Phys. 71, 124 (1987)] and used to derive constraints on the q profile. It is shown that the observed RSAEs can be understood by assuming a reversed shear q profile (up chirping) or a q profile with a local maximum (down chirping) with q[approximate]1.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
http://dx.doi.org/10.1063/1.3086869
