Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas
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Rice-2011-Rotation Reversal Bifurcation and Energy.pdf
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Author(s)
Rice, John E.
Cziegler, Istvan
Diamond, P. H.
Duval, B. P.
Podpaly, Yuri A.
Reinke, Matthew Logan
Ennever, Paul Chappell
Greenwald, Martin J.
Hughes, Jerry W.
Ma, Y.
Date Issued
December 2011
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Rice, J. et al. “Rotation Reversal Bifurcation and Energy Confinement Saturation in Tokamak Ohmic L-Mode Plasmas.” Physical Review Letters 107.26 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
Direction reversals of intrinsic toroidal rotation have been observed in diverted Alcator C-Mod Ohmic L-mode plasmas following electron density ramps. For low density discharges, the core rotation is directed cocurrent, and reverses to countercurrent following an increase in the density above a certain threshold. Such reversals occur together with a decrease in density fluctuations with 2 cm[superscript -1]≤k[subscript θ]≤11 cm[superscript -1] and frequencies above 70 kHz. There is a strong correlation between the reversal density and the density at which the Ohmic L-mode energy confinement changes from the linear to the saturated regime.
MIT Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.107.265001
