Caractérisation, Modélisation et Contrôle des Scénarios Avancés dans le Tokamak Européen JET

Abstract : The advanced scenarios, developed for less than ten years with the internal transport barriers and the control of current profile, give rise to a ‘new deal' for the tokamak as a future thermonuclear controlled fusion reactor. The Joint European Torus (JET) in United Kingdom is presently the most powerful device in terms of fusion power and it has allowed to acquire a great experience in these improved confinement regimes. The reduction of turbulent transport, considered now as closely linked to the shape of current profile optimised for instance by lower hybrid current drive or the self-generated bootstrap current, can be characterised by a dimensionless criterion. Most of useful information related to the transport barriers are thus available. Large database analysis and real time plasma control are envisaged as attractive applications. The so-called “S”-shaped transport models exhibit some interesting properties in fair agreement with the experiments, while the non-linear multivariate dependencies of thermal diffusivity can be approximated by a neural network, suggesting a new approach for transport investigation and modelling. Finally, the first experimental demonstrations of real time control of internal transport barriers and current profile have been performed on JET. Sophisticated feedback algorithms have been proposed and are being numerically tested to achieve steady-state and efficient plasmas.
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Physique Nucléaire Théorique [nucl-th]. Université de Provence - Aix-Marseille I, 2002. Français


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Contributor : Guillaume Tresset <>
Submitted on : Wednesday, October 9, 2002 - 12:33:41 PM
Last modification on : Friday, September 11, 2015 - 9:50:01 AM
Document(s) archivé(s) le : Friday, April 2, 2010 - 8:00:47 PM

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Guillaume Tresset. Caractérisation, Modélisation et Contrôle des Scénarios Avancés dans le Tokamak Européen JET. Physique Nucléaire Théorique [nucl-th]. Université de Provence - Aix-Marseille I, 2002. Français. <tel-00001803>

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