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Abstract

Parametric scalings of the intrinsic (spontaneous, with no external momentum input) toroidal rotation observed on a large number of tokamaks have been combined with an eye towards revealing the underlying mechanism(s) and extrapolation to future devices. The intrinsic rotation velocity has been found to increase with plasma stored energy or pressure in JET, Alcator C-Mod, Tore Supra, DIII-D, JT-60U and TCV, and to decrease with increasing plasma current in some of these cases. Use of dimensionless parameters has led to a roughly unified scaling with M(A) is proportional to beta(N), although a variety of Mach numbers works fairly well; scalings of the intrinsic rotation velocity with normalized gyro-radius or collisionality show no correlation. Whether this suggests the predominant role of MHD phenomena such as ballooning transport over turbulent processes in driving the rotation remains an open question. For an ITER discharge with beta(N) = 2.6, an intrinsic rotation Alfven Mach number of M(A) ~ 0.02 may be expected from the above deduced scaling, possibly high enough to stabilize resistive wall modes without external momentum input.

Additional information

Authors: GREENWALD M J, Plasma Science and Fusion Center, MIT, Cambridge (US);MARMAR E S, Plasma Science and Fusion Center, MIT, Cambridge (US);PODPALY Y, Plasma Science and Fusion Center, MIT, Cambridge (US);DEGRASSIE J S, General Atomics, La Jolla (US);BURRELL K H, General Atomics, La Jolla (US);GROEBNER R J, General Atomics, La Jolla (US);ERIKSSON L-G, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);FENZI-BONIZEC C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);HOANG G T, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);SAKAMOTO Y, Japan Atomic Energy Agency, Naka (JP);KOIDE Y, Japan Atomic Energy Agency, Naka (JP);SCARABOSIO A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);BORTOLON A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);DUVAL B P, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);POCHELON A, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);RICE J E, Plasma Science and Fusion Center, MIT, Cambridge (US);INCE-CUSHMAN A, Plasma Science and Fusion Center, MIT, Cambridge (US)
Bibliographic Reference: An article published in: Nuclear Fusion 47 1618-1624 (2007)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/10.1088/0029-5515/47/11/025
Record Number: 200819681 / Last updated on: 2008-02-15
Category: PUBLICATION
Original language: en
Available languages: en
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