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Abstract

Lowcollisionality, lowparticle source, ELMyH-modes (type-III) with sawteeth are produced in JET in order to address the question of density profile evolution in the reference q(95) = 3 ITER scenario. The paper focuses on particle transport in the core zone around the mid-radius. The pedestal region includingELMsand the region affected by sawteeth are not considered. By replacing a significant part of the neutral beam heating by RF power the beam particle flux at midradius has been reduced to Gamma(Beam)/n(e) = 0.07ms{-1}. The additional flux due to wall neutrals is estimated as Gamma(Wall)/n(e) </= 0.12ms{-1}. Density profiles are found to be modestly peaked under these conditions with a relative density difference of Deltan/<n> = 0.23 across the zone not affected by sawteeth and ELMs. In a region around the mid-radius the ratio of effective particle diffusivity to electron thermal diffusivity is found to be D(e,eff)/?(e) � 0.2, which might indicate an anomalous pinch provided the particle diffusivity De is sufficiently large. The measured values of D(e,eff)/?(e) are at the lower end of the range used in ITER models.

Additional information

Authors: VALOVIC M, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);GARZOTTI L, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);KOROTKOV A A, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);ALPER B, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);MCDONALD D, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);LEGGATE H, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);GIROUD C, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);PARAIL V, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);VOITSEKHOVITCH I, EURATOM-UKAEA Fusion Association, Culham Science Centre, Abingdon (GB);BUDNY R, PPPL Princeton, University NJ (US);DEVRIES P, FOM-Rijnhuisen, Association EURATOM-FOM, Nieuwegein (NL);BEURSKENS M, FOM-Rijnhuisen, Association EURATOM-FOM, Nieuwegein (NL);BRZOZOWSKI J, EFDA KTH Royal Institute of Technology, Stockholm (SE);GARBET X, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);RAPP J, Institut für Plasmaphysik, Forschungszentrum Jülich, Association EURATOM/FZJ, Trilateral Euregio Cluster, Jülich (DE);NEU R, Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association, Garching (DE);SAUTER O, Centre de Recherches en Physique des Plasmas, Association EURATOM-Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: An article published in: Plasma Physics and Controlled Fusion 46 (2004) 1877�1889 PII: S0741-3335(04)76931-6
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: doi:10.1088/0741-3335/46/12/006
Record Number: 200518137 / Last updated on: 2005-06-06
Category: PUBLICATION
Original language: en
Available languages: en