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Abstract

The physics of internal transport barrier (ITB) formation in JET has been investigated using micro-stability analysis, profile modelling and turbulence simulations. The calculation of linear growth rates shows that magnetic shear plays a crucial role in the formation of the ITB. Shafranov shift, ratio of the ion to electron temperature, and impurity content further improve the stability. This picture is consistent with profile modelling and global fluid simulations of electrostatic drift waves. Turbulence simulations also show that rational q values may play a special role in triggering an ITB. The same physics also explains how double internal barriers can be formed.

Additional information

Authors: GARBET X ET AL, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BARANOV Y, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PARAIL V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);THYAGARAJA A, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);BATEMAN G ET AL, Lehigh University Physics Department, Bethlehem (US);BUDNY R, Princeton Plasma Physics Laboratory, Princeton (US);CRISANTI F, Associazione Euratom-ENEA sulla Fusione, C.R. Frascati, Frascati (IT);ESPOSITO B, Associazione Euratom-ENEA sulla Fusione, C.R. Frascati, Frascati (IT);MANTICA P, Istituto di Fisica del Plasma CNR-EURATOM, Milano (IT);TALA T, Association EURATOM-TEKES, VTT (FI);BENKADDA S ET AL, LPIIM, Centre Universitaire de Saint-Jerôme, Marseille (FR);PEETERS A, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);TARDINI G, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);WEILAND J, Chalmers University of Technology and EURATOM-VR Assocation, Göteborg (SE);WOLF R, Institut für Plasmaphysik, Association EURATOM/FZJ, Jülich (DE)
Bibliographic Reference: An article published in: Nuclear Fusion 43 (2003) pp.975�981
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/NF/43/975
Record Number: 200316840 / Last updated on: 2003-10-08
Category: PUBLICATION
Original language: en
Available languages: en