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

   
I. Voitsekhovitch ¹, X. Garbet ², D. Moreau ², R. V. Budny ³, C. E. Bush ^2,4, P. Gohil ⁵, J. E. Kinsey ⁵, X. Litaudon ^2,6, T. S. Taylor ^5
 
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 $\rm E \times B$ 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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