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Quasi-steady operation has been achieved at JET in the high-confinement regime with internal transport barriers (ITBs). The ITB has been maintained up to 11s. This duration, much larger than the energy confinement time, is already approaching a current resistive time. The high-performance phase is limited only by plant constraints. The radial profiles of the thermal electron and ion pressures have steep gradients typically at mid-plasma radius. A large fraction of non-inductive current (above 80%) is sustained throughout the high-performance phase with a poloidal beta exceeding unity. The safety factor profile plays an important role in sustaining the ITB characteristics. In this regime, where the self-generated bootstrap current (up to 1.0MA) represents 50% of the total current, the resistive evolution of the non-monotonic q-profile is slowed down by using off-axis lower-hybrid current drive.

Additional information

Authors: LITAUDON X ET AL, Association Euratom-CEA Cadarache, St. Paul-lez-Durance (FR);CRISANTI F ET AL, Associazione Euratom-ENEA sulla Fusione, Frascati (IT);ALPER B ET AL, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);CONWAY G D, IPP-EURATOM Assoziation, Max-Planck-Institut für Plasmaphysik, Garching (DE);DUX R, IPP-EURATOM Assoziation, Max-Planck-Institut für Plasmaphysik, Garching (DE);MANTSINEN M, Association Euratom-Tekes, Espoo (FI);POHN E, Association EURATOM-ÖAW, Wien (AT)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion, 44 (July 2002), pp. 1057-1086
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