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(THP2/14) Evolution of Thermal Ion Transport Barriers in Reversed Shear / Optimised Shear Plasmas

I. Voitsekhovitch¹, X. Garbet², D. Moreau², R. V. Budny³, C. E. Bush^{2, 4}, P. Gohil⁵, J. E. Kinsey⁵, X. Litaudon^{2, 6}, T. S. Taylor⁵

¹ LPIIM, Equipe Turbulence Plasma, CNRS/Université de Provence, Marseille, France (Permanent address: RRC ``Kurchatov Institute'', Moscow, Russia)
² DRFC, CEA-Cadarache, 13108, St. Paul lez Durance Cedex, France
³ Princeton Plasma Physics Laboratory, Princeton, New Jersey, USA
⁴ Permanent address : ORNL, Oak Ridge, Tenessee, USA
⁵ General Atomics, San Diego, California, USA
⁶ Presently at JET Joint Undertaking, Abingdon, U.K.

Abstract.  The effects of the magnetic and E×B rotation shears on the thermal ion transport in advanced tokamak scenarios are analyzed through the predictive modelling of the evolution of internal transport barriers. Such a modelling is performed with an experimentally validated L-mode thermal diffusivity completed with a semi-empirical shear correction which is based on simple theoretical arguments from turbulence studies. A multi-machine test of the model on relevant discharges from the ITER Data Base (TFTR, DIII-D and JET) is presented.

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