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Formation and Stability of Impurity “Snakes” in Tokamak Plasmas

Author(s)
Delgado-Aparicio, Luis; Sugiyama, Linda E.; Granetz, Robert S.; Gates, D. A.; Rice, John E.; Reinke, Matthew Logan; Bitter, M.; Fredrickson, E.; Greenwald, Martin J.; Hill, K.; Hubbard, Amanda E.; Hughes, Jerry W.; Pablant, N.; Scott, S.; Wilson, R.; Marmar, Earl S.; Podpaly, Y.; Wolfe, S.; Wukitch, Stephen James; Gao, Chi, Ph. D. Massachusetts Institute of Technology; ... Show more Show less
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Abstract
New observations of the formation and dynamics of long-lived impurity-induced helical “snake” modes in tokamak plasmas have recently been carried out on Alcator C-Mod. The snakes form as an asymmetry in the impurity ion density that undergoes a seamless transition from a small helically displaced density to a large crescent-shaped helical structure inside q<1, with a regularly sawtoothing core. The observations show that the conditions for the formation and persistence of a snake cannot be explained by plasma pressure alone. Instead, many features arise naturally from nonlinear interactions in a 3D MHD model that separately evolves the plasma density and temperature.
Date issued
2013-02
URI
http://hdl.handle.net/1721.1/78312
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Delgado-Aparicio, L. et al. “Formation and Stability of Impurity ‘Snakes’ in Tokamak Plasmas.” Physical Review Letters 110.6 (2013). © 2013 American Physical Society
Version: Final published version

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