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Abstract

It is shown here that microturbulence can be stabilized in the presence of steep temperature and density profiles. Indeed in high Beta plasmas, pressure profile gradients are associated with high [Beta�]=-Delta Beta/Delta Rho , where Beta = Rho(Beta {2}2/2 Mu(0)) and Rho the square root of the toroidal flux normalized to its edge value. It is shown here that high values of [Beta�] have a stabilizing influence on drift modes. This may form the basis for a positive feedback loop in which high core beta values lead to improved confinement, and to further increase in Beta. [�] high Beta spherical tokamak plasmas, high [Beta�] rather than low aspect ratio is a source of stabilization.

Additional information

Authors: BOURDELLE C, Association Euratom-CEA, CEA/DSM/DRFC, CEA Cadarache, Saint-Paul-lez-Durance (FR);GARBET X, Association Euratom-CEA, CEA/DSM/DRFC, CEA Cadarache, Saint-Paul-lez-Durance (FR);DORLAND W, Department of Physics, University of Maryland, College Park, Maryland (US);HAMMETT G W, Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey (US);REWOLDT G, Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey (US);SYNAKOWSKI E J, Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey (US);KOTSCHENREUTHER M, Institute for Fusion Studies, University of Texas at Austin, Austin, Texas (US)
Bibliographic Reference: Article published in: Physics of plasmas, Volume 10, Number 7, July 2003, pp 2881-2887
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://ojps.aip.org/pop/popcr.jsp
Record Number: 200417375 / Last updated on: 2004-02-02
Category: PUBLICATION
Original language: en
Available languages: en