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Abstract

Quasi-steady operation has been achieved at JET in the high confinement regime with Internal Transport Barriers, ITBs. The ITBs' performances are 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.

This paper is an extended version of a contribution to the 28th EPS Conference on Controlled Fusion and Plasma Physics, held at Funchal, Madeira, Portugal, June 2001. .

Additional information

Authors: LITAUDON X ET AL, Association EURATOM-CEA, CEA/Cadarache, Saint Paul Lez Durance (FR);CRISANTI F AT AL, Association EURATOM-ENEA, Frascati (IT);ALPER B ET AL, Euratom-UKAEA Fusion Association, Abingdon (GB);CONWAY G D, IPP-EURATOM Association, Max-Planck-Institut fur Plasmaphysik, Garching (DE);DUX R, IPP-EURATOM Association, Max-Planck-Institut fur Plasmaphysik, Garching (DE);MANTSINEN M, Association Euratom-Tekes, Espoo (FI);POHN E, Association EURATOM-OAW, Vienna (AT)
Bibliographic Reference: Report: EUR-CEA-FC-1723, January 2002, pp. 52. Euro:Free of charge.
Availability: Available from: Association EURATOM-CEA sur la Fusion Controlee, CEA/Cadarache, F-13108 Saint Paul Lez Durance (FR)
Record Number: 200214418 / Last updated on: 2002-02-15
Category: PUBLICATION
Original language: en
Available languages: en