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This paper presents the results of three-dimensional fluid global simulations of electrostatic ion turbulence in tokamaks with reversed magnetic shear. It is found that a transport barrier appears at the location of magnetic shear reversal. This is due to a rarefaction of resonant surfaces in this region. For the same reason, the barrier is more pronounced when the minimum of the safety factor is a simple rational number. The barrier is broadened by velocity shear effects. It is also found that large-scale transport events hardly cross a transport barrier. Finally, a significant amount of toroidal rotation is generated by the turbulence. This rotation changes its sign at the position of magnetic shear reversal, as expected from a quasi-linear estimate of the Reynolds stress tensor.

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Authors: GARBET X ET AL, Association Euratom-CEA Cadarache, St. Paul-lez-Durance (FR);BENKADDA S ET AL, Laboratoire P.I.I.M, UMR 6633 CNRS-Université de Provence, Centre Universitaire de Saint Jérôme, Marseille (FR)
Bibliographic Reference: An article published in: Physics of Plasmas, June 2001, Volume 8, Issue 6, pp. 2793-2803
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