|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|
|Type of Article||Article|
|Keywords||CONFINEMENT, CORE, FLUX, PLASMA, PROFILE, TRANSPORT|
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|
|Alternate Title||Plasma Phys. Control. Fusion|
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