EDGE2D modelling of edge profiles obtained in JET diagnostic optimized configuration

A. Kallenbach, Y. Andrew, M. Beurskens, G. Corrigan, T. Eich, S. Jachmich, M. Kempenaars, A. Korotkov, A. Loarte, G. Matthews, P. Monier-Garbet, G. Saibene, J. Spence, W. Suttrop

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

Nine type-I ELMy H-mode discharges in diagnostic optimized configuration in JET are analysed with the EDGE2D/NIMBUS package. EDGE2D solves the fluid equations for the conservation of particles, momentum and energy for hydrogenic and impurity ions, while neutrals are followed with the two-dimensional Monte Carlo module NIMBUS. Using external boundary conditions from the experiment, the perpendicular heat conductivities χi,e and the particle transport coefficients D, v are varied until good agreement between code result and measured data is obtained. A step-like ansatz is used for the edge transport parameters for the outer core region, the edge transport barrier and the outer scrape-off layer. The time-dependent effect of edge localized modes on the edge profiles is simulated with an ad hoc ELM model based on the repetitive increase of the transport coefficients χi,e and D. The values of the transport coefficients are matched to experimental data mapped to the outer midplane, in the course of which radial shifts of experimental profiles of the order of 1 cm caused by the accuracy limit of the equilibrium reconstruction are taken into account. Simulated divertor profiles obtained from the upstream transport ansatz and the experimental boundary conditions agree with measurements, except a small region localized at the separatrix strike points which is supposed to be affected by direct ion losses. The integrated analysis using EDGE2D modelling, although still limited by the marginal spatial resolution of individual diagnostics, allows the characterization of profiles in the edge/pedestal region and supplies additional information on the separatrix position. The steep density gradient zone inside the separatrix shrinks compared to the electron temperature with increasing density, indicating the effect of the neutral penetration depth becoming shorter than the region of reduced transport.

langue originaleAnglais
Pages (de - à)431-446
Nombre de pages16
journalPlasma Physics and Controlled Fusion
Volume46
Numéro de publication3
Les DOIs
étatPublié - mars 2004

Empreinte digitale

Examiner les sujets de recherche de « EDGE2D modelling of edge profiles obtained in JET diagnostic optimized configuration ». Ensemble, ils forment une empreinte digitale unique.

Contient cette citation