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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 the United Kingdom is currently the most powerful device in terms of fusion power and it has allowed great experience in these improved confinement regimes to be acquired. 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. Much useful information related to the transport barriers is 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.

Additional information

Authors: TRESSET G, Association EURATOM-CEA sur la Fusion Contrôlée, DRFC, CEA Cadarache, Saint Paul Lez Durance (FR)
Bibliographic Reference: CEA Cadarache, Report no. EUR-CEA-FC-1727, November 2002. pp.196.
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail:
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