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Abstract

This paper analyses the properties of a critical gradient transport model based on a few assumptions: electrostatic gyroBohm scaling law, existence of an instability threshold and finite background transport below the threshold. A quantitative criterion of stiffness is proposed, which provides the means for a quantitative assessment and inter-machine comparison. It is also shown that this transport model is compatible with a two-term scaling law of global confinement, as proposed recently by the International Tokamak Physics Activity�Confinement Data Base and ModellingTopical Group. This model has also been applied to analyse a variety of experiments mostly using electron heat modulation on JET, ASDEX-Upgrade, TORESUPRAand FTU. The thresholds are found to be in the expected domain for micro-instabilities in tokamaks. However, the stiffness factor is found to cover a broad range of variation.

Additional information

Authors: GARBET X, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);IMBEAUX F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ASP E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);MANTICA P, Istituto di Fisica del Plasma, EURATOM�ENEA�CNR Association Milano (IT);SOZZI C, Istituto di Fisica del Plasma, EURATOM�ENEA�CNR Association Milano (IT);RYTER F, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);MANINI A, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);R WOLF, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);CORDEY G, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PARAIL V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, Vol. 46 (2004), p. 1351-1373
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: stacks.iop.org/PPCF/46/1351
Record Number: 200518105 / Last updated on: 2005-04-25
Category: PUBLICATION
Original language: en
Available languages: en
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