Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas
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Author(s)
Podpaly, Y. A.
Diamond, P. H.
Ma, Y.
Cziegler, Istvan
Duval, B. P.
Gao, Chi
Rice, John E.
Greenwald, Martin J.
Reinke, Matthew Logan
Hughes, Jerry W.
Date Issued
March 2012
Journal
Physics of Plasmas
Publisher
American Institute of Physics (AIP)
Citation
Rice, J. E., M. J. Greenwald, Y. A. Podpaly, M. L. Reinke, P. H. Diamond, J. W. Hughes, N. T. Howard, et al. “Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas.” Physics of Plasmas 19, no. 5 (2012): 056106.
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Author's final manuscript
Abstract
Ohmic energy confinement saturation is found to be closely related to core toroidal rotation reversals in Alcator C-Mod tokamak plasmas. Rotation reversals occur at a critical density, depending on the plasma current and toroidal magnetic field, which coincides with the density separating the linear Ohmic confinement regime from the saturated Ohmic confinement regime. The rotation is directed co-current at low density and abruptly changes direction to counter-current when the energy confinement saturates as the density is increased. Since there is a bifurcation in the direction of the rotation at this critical density, toroidal rotation reversal is a very sensitive indicator in the determination of the regime change. The reversal and confinement saturation results can be unified, since these processes occur in a particular range of the collisionality.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Plasma Science and Fusion Center
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DOI of Published Version
https://doi.org/10.1063/1.3695213
