Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..dppkp1024e&link_type=abstract
American Physical Society, 47th Annual DPP Meeting, October 24-28, 2005, abstract #KP1.024
Physics
Scientific paper
The phase contrast imaging (PCI) system on Alcator C-Mod has observed reverse shear Alfv'en eigenmodes (RSAE) during the current ramp with early ICRF heating. Using the ideal MHD code NOVA^1, the frequency chirping characteristics of these modes can be modeled with good accuracy. It is noted that the minimum frequency may be interpreted as the geodesic deformation of Alfv'en continuum at low frequency^2. RSAEs observed with PCI show intermittent behavior that suggests a significant continuum interaction. Ignoring fast particle effects, the MHD eigenmode solutions from NOVA are compared to the experimental data. The central shear and qmin are adjusted until a good fit is achieved. Possible q profiles based on this analysis will be presented. ^* Work supported by USDOE Contract DE-AC02-76-CH0-3073 and Coop. Agree. No. DE-FC02-99-ER54512^1C.Z. Cheng and M.S. Chance, J. Comp. Phys. 71, 124 (1987).^2M.S. Chu et al., Phys. Fluids B 4, 3713 (1992).
Edlund E. M.
Kramer Gerrit J.
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