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(EX6/1) Electron Transport and Improved Confinement on Tore Supra

G. T. Hoang¹⁾, C. Bourdelle¹⁾, X. Garbet¹⁾, T. Aniel¹⁾, G. Giruzzi¹⁾, M. Ottaviani¹⁾, W. Horton²⁾, P. Zhu²⁾, R. V. Budny^3)
 
1) Association EURATOM-CEA CEA-Cadarache, France
²⁾ Institute for Fusion Studies, The University of Texas, Austin, USA
³⁾ Princeton Plasma Physics Laboratory, Princeton, NJ08543 USA

Abstract.  Magnetic shear is found to play an important role for triggering various improved confinement regimes through the electron channel. A wide database of hot electron plasmas ( T_e > 2T_i) heated by fast wave electron heating (FWEH) is analyzed for electron thermal transport. A critical gradient is clearly observed. It is found that the critical gradient linearly increases with the ratio between local magnetic shear (s) and safety factor (q). The Horton model, based on the electromagnetic turbulence driven by the electron temperature gradient (ETG) mode, is found to be a good candidate for electron transport modeling.

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