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Abstract

In JET, advanced tokamak research mainly focuses on plasmas with internal transport barriers (ITBs) that are strongly influenced by the current density profile. A previously developed optimized shear regime with low magnetic shear in the plasma centre has been extended to deeply negative magnetic shear configurations. High fusion performance with wide ITBs has been obtained transiently with negative central magnetic shear configuration: (H(IPB98(y,2)) approximately 1.9, Beta(N) = 2.4 at I(p) = 2.5 MA. At somewhat reduced performance, electron and ion ITBs have been sustained in full current drive operation with 1 MA of bootstrap current: H(IPB98(y,2)) ~ 1, Beta(N) = 1.7 at I(p) = 2.0 MA. The ITBs were maintained for up to 11 s for the latter case. This duration, much larger than the energy confinement time (37 times larger), is already approaching a current resistive time. New real-time measurements and feedback control algorithms have been developed and implemented in JET for successfully controlling the ITB dynamics and the current density profile in the highly non-inductive current regime.

Additional information

Authors: LITAUDON X ET AL, Association EURATOM-CEA, CEA Cadarache, St Paul lez Durance (FR);CRISANTI F ET AL, Associazione EURATOM-ENEA sulla Fusione, Centre Ricerche Frascati (IT);BARANOV Y F ET AL, UKAEA-EURATOM Association, Culham Science Centre, Abingdon (GB);BUDNY R, Princeton Plasma Physics Laboratory, Princeton (US);STRATTON B C, Princeton Plasma Physics Laboratory, Princeton (US);DE BAAR M R, Ass. EURATOM-FOM, TEC Cluster, Nieuwegein (NL);DE VRIES P, Ass. EURATOM-FOM, TEC Cluster, Nieuwegein (NL);GIROUX C, Ass. EURATOM-FOM, TEC Cluster, Nieuwegein (NL);HOGEWEIJ G M D, Ass. EURATOM-FOM, TEC Cluster, Nieuwegein (NL);GORINI G, Instituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milan (IT);MANTICA P, Instituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milan (IT);HELLSTEN T, Physics Department, KTH, Association EURATOM/VR, Stockholm (SE);RACHLEW E, Physics Department, KTH, Association EURATOM/VR, Stockholm (SE);MANTSINEN M J, Association EURATOM-TEKES, VTT Chemical Technology (FI);TALA T J J, Association EURATOM-TEKES, VTT Chemical Technology (FI);WOLF R C, Institut für Plasmaphysik, Association EURATOM-FZJ, Jülich (DE);CONWAY G D, Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Garching (DE);DUX R, Max-Planck-Institut für Plasmaphysik, EURATOM-Assoziation, Garching (DE)
Bibliographic Reference: An article published in: Nuclear Fusion 43 (July 2003) 565-572
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0029-5515/43/565
Record Number: 200317054 / Last updated on: 2003-10-29
Category: PUBLICATION
Original language: en
Available languages: en