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Abstract

Internal transport barriers (ITBs) can be produced in JET by the application of strong additional heating during the current rise phase of the plasma discharge. Using up to 3 MW of lower hybrid power to tailor the q-profile prior to the main heating phase, a large variety of q-profiles ranging from low positive to strong negative central shear have been obtained during the current rise (0.4 MA s{-1}). With negative central magnetic shear s = (r/q)(&ddiff;r/&ddiff;q), the analysis of ITB triggering reveals a correlation between the formation of the ITB and q(&min;) reaching an integer value (q = 2 or q = 3). This observation is confirmed by the analysis of the Alfvèn cascades. The minimum power required to access regimes with ITBs is probably related to the transport and magnetohydrodynamic properties of integer magnetic surfaces. Laser ablation and shallow pellet injection have also been attempted in recent JET ITB triggering experiments.

Additional information

Authors: JOFFRIN E, Departement de Recherches sur la Fusion Contrôlée, Association EURATOM - CEA, CEA Cadarache, Saint-Paul-Lez-Durance (FR);MAGET P, Departement de Recherches sur la Fusion Contrôlée, Association EURATOM - CEA, CEA Cadarache, Saint-Paul-Lez-Durance (FR);MAZON D, Departement de Recherches sur la Fusion Contrôlée, Association EURATOM - CEA, CEA Cadarache, Saint-Paul-Lez-Durance (FR);TRESSET G, Departement de Recherches sur la Fusion Contrôlée, Association EURATOM - CEA, CEA Cadarache, Saint-Paul-Lez-Durance (FR);GORINI G, Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milan (IT);MANTICA P, Istituto di Fisica del Plasma, EURATOM-ENEA-CNR Association, Milan (IT);CHALLIS C D, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);HAWKES N C, Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);HENDER T C, ;HOWELL D F, ;SHARAPOV S E,
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 44 (August 2002) pp.1739-1752
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://stacks.iop.org/0741-3335/44/1739
Record Number: 200315732 / Last updated on: 2003-01-10
Category: PUBLICATION
Original language: en
Available languages: en
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