Density peaking in low collisionality ELMy H-mode in JET

TitleDensity peaking in low collisionality ELMy H-mode in JET
Publication TypeJournal Article
Year of Publication2004
AuthorsM. Valovic, R. Budny, L. Garzotti, X. Garbet, A.A Korotkov, J. Rapp, R. Neu, O. Sauter, P. de Vries, B. Alper, M. Beurskens, J. Brzozowski, D. McDonald, H. Leggate, C. Giroud, V. Parail, I. Voitsekhovitch
JournalPlasma Physics and Controlled Fusion
Date PublishedDec
Type of ArticleArticle
ISBN Number0741-3335
Accession NumberISI:000226127400007

Low collisionality, low particle source. ELMy H-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 including ELMs and 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 mid-radius has been reduced to Gamma(Beam)/n(e) = 0.07 m s(-1). The additional flux due to wall neutrals is estimated as Gamma(Wall)/n(e) = 0.12 m s(-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,D-eff/chi(e) approximate to 0.2, which might indicate an anomalous pinch provided the particle diffusivity D-e is sufficiently lame. The measured values of D-e,D-eff/chi(e) are at the lower end of the range used in ITER models.

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Fusion Physics


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Alternate TitlePlasma Phys. Control. Fusion

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