Title | Density peaking in low collisionality ELMy H-mode in JET |
Publication Type | Journal Article |
Year of Publication | 2004 |
Authors | M. 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 |
Journal | Plasma Physics and Controlled Fusion |
Volume | 46 |
Number | 12 |
Pagination | 1877-1889 |
Date Published | Dec |
Type of Article | Article |
ISBN Number | 0741-3335 |
Accession Number | ISI:000226127400007 |
Keywords | CONFINEMENT, CORE, FLUX, PLASMA, PROFILE, TRANSPORT |
Abstract | 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. |
URL | <Go to ISI>://000226127400007 |
Division | Fusion Physics |
Department | Instrumentation development |
PID | e578b622d26b52b7dfb651ed01776d50 |
Alternate Title | Plasma Phys. Control. Fusion |
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