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In Tore Supra plasmas with fast wave electron heating, a critical threshold in the electron temperature gradient is clearly observed, i.e., a final value for which the turbulent heat diffusivity vanishes. The radial profile of this critical gradient is experimentally determined from a set of discharges characterized by similar plasma parameters with fast wave powers ranging form 0.75 to 7.4 MW. The dependence of the electron heat flux on the gradient length is found to be offset linearly. The offset term increases linearly with the ratio of the local magnetic shear to the safety factor.

Additional information

Authors: HOANG G T ET AL, CEA Cadarache, Departement de Recherche sur la Fusion Controlie, Saint-Paul-lez-Durance (FR);HORTON W, University of Texas at Austin, Institute for Fusion Studies (US);ZHU P, University of Texas at Austin, Institute for Fusion Studies (US);BUDNY R V, Princeton University, Princeton Plasma Physics Laboratory (US)
Bibliographic Reference: An article published in: Physical Review Letters, Vol.87, No.12 (2001), pp.125001/1-125001/4
Record Number: 200114053 / Last updated on: 2001-11-15
Original language: en
Available languages: en