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Abstract

In relevant ITER plasma scenario, the understanding of current relaxation properties and the control of non-inductive currents and of the remnant ohmic is an important challenge in large tokamak design and operation. TH etime scale for current diffusion is often the longest plasma time scale in a tokamak. Producing long duration discharges exceeding the current diffusion timescale can therefore strongly contribute to the validation of steady state ITER scenarios. In addition, X-point discharges of typically one minute can also strongly contribute to the study of wall saturation and particle inventory arising in longer time scale.
This paper reports on the recent physical and technical progresses achieved in JET on the route towards long duration staionary discharges where inductively driven current is close to its equilibrium value. The heat and current transport analysis of these types III ELM H-mode discharges with Internal Transport Barrier (ITB) are showing interesting feature for the development of current and pressure control. Other long pulse experiments have also achived L-mode discharges in JET for almost one minute and are indicating that deuterium retention rate reaches only 6% of the injected fuel.

Additional information

Authors: JOFFRIN E, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LITAUDON X, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);LOARER T, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);THOMA C, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);DE VRIES P, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);FELTON R, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);LOMAS P, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);MAZON D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);RICCARDO V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ZASTROW K, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PERICOLI RIDOLFINI V, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT);TUCCILLO A, Associazione Euratom-ENEA sulla Fusione, Centro.Richerche Energia ENEA-Frascati, Frascati (IT)
Bibliographic Reference: An oral paper given at: 32nd EPS Conference on Controlled Fusion and Plasma Physics Organised by: Asociación EURATOM-CIEMAT para Fusión Held at: Congress Palace of Tarragona, Tarragona (ES)
Availability: Available from Association EURATOM-CEA, Departement de Recherches sur la Fusion Controlee, CEA Cadarache, F-13108 St Paul-Lez-Durance, FranceL%Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: dirdrfc@drfc.cad.cea.fr
Record Number: 200518279 / Last updated on: 2005-07-26
Category: PUBLICATION
Original language: en
Available languages: en