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

J. E. Rice | Zendy; M. Greenwald | Zendy; Y. Podpaly | Zendy; M.L. Reinke | Zendy; P. H. Diamond | Zendy; J. W. Hughes | Zendy; N. T. Howard | Zendy; Y. Ma | Zendy; I. Cziegler | Zendy; B.P. Duval | Zendy; P. Ennever | Zendy; D. R. Ernst | Zendy; C. L. Fiore | Zendy; C. Gao | Zendy; J. Irby | Zendy; E. S. Marmar | Zendy; M. Porkoláb | Zendy; N. Tsujii | Zendy; S. Wolfe | Zendy

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

Author(s) -

J. E. Rice,

M. Greenwald,

Y. Podpaly,

M.L. Reinke,

P. H. Diamond,

J. W. Hughes,

N. T. Howard,

Y. Ma,

I. Cziegler,

B.P. Duval,

P. Ennever,

D. R. Ernst,

C. L. Fiore,

C. Gao,

J. Irby,

E. S. Marmar,

M. Porkoláb,

N. Tsujii,

S. Wolfe

Publication year - 2012

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.3695213

Subject(s) - alcator c mod , physics , collisionality , toroid , ohmic contact , plasma , tokamak , saturation (graph theory) , rotation (mathematics) , joule heating , condensed matter physics , magnetic confinement fusion , current density , atomic physics , magnetohydrodynamics , nuclear physics , geometry , quantum mechanics , mathematics , electrode , combinatorics

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.United States. Dept. of Energy (Contract DE-FC02-99ER54512

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