Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

Ohmic energy confinement saturation and core toroidal rotation reversal in Alcator C-Mod plasmas

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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...

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Bibliographic Details
Main Authors: 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., Howard, Nathaniel Thomas, Ennever, Paul Chappell, Ernst, Darin R., Fiore, Catherine L., Irby, James Henderson, Marmar, Earl S., Porkolab, Miklos, Tsujii, Naoto, Wolfe, Stephen M.
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Institute of Physics (AIP) 2013
Online Access:http://hdl.handle.net/1721.1/80275
https://orcid.org/0000-0003-3234-8733
https://orcid.org/0000-0001-8319-5971
https://orcid.org/0000-0002-9518-4097
https://orcid.org/0000-0002-9604-204X
https://orcid.org/0000-0002-4438-729X
https://orcid.org/0000-0002-5283-0546
https://orcid.org/0000-0002-0026-6939
Description
Summary: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.

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