Journal Article

PreJuSER-23505

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Radiation pattern and impurity transport in argon seeded ELMy H-mode discharges in JET

Puiatti, M. E. ; Mattioli, M. ; Telesca, V. M. ; Valisa, M. ; Coffey, I. H. ; Dumortier, P. ; Giroud, C. ; Ingesson, L. C. ; Lawson, K. D. ; Maddison, G. ; Messiaen, A. M. ; Monier-Garbet, P. ; Murari, D. M. ; Nave, M. F. F. ; Ongena, J. ; Rapp, J.FZJ* ; Strachan, J. ; Unterberg, B.FZJ* ; von Hellermann, M.

2002
IOP Publ. Bristol

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Please use a persistent id in citations: http://hdl.handle.net/2128/1764  doi:10.1088/0741-3335/44/9/305

Abstract: paper addresses the issues of impurity behaviour during the argon seeding experiments in JET, in which argon and D-2 have been simultaneously puffed in ELMy H-mode discharges to reach high density regimes, maintaining good confinement properties throughout the plasma discharge. The analysis is based mainly on a 1-D impurity diffusion model, which evaluates the impurity transport coefficients in three experimental scenarios.The available experimental data include, as a function of the time, the brightnesses of the soft x-rays and of several impurity lines, the effective charge Z(eff) the profiles of the radiated power and the fully stripped Ar and C ion densities from charge-exchange recombination. From the simulation of these data it is possible to characterize the considered scenarios in terms of high-Z ion increase in the plasma centre and high radiation from the edge. In particular, it has been found that the configuration at high triangularity with continuous D-2 puffing, characterized by an outward impurity pinch velocity, features flat or slightly hollow impurity ion profiles and high radiation from a narrow region at the edge, possibly associated to the presence of a significant neutral density. In this case an edge radiative mantle is established without high radiation from the plasma centre.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut für Plasmaphysik (IPP)

Research Program(s):

1. Kernfusion und Plasmaforschung (E05)

Appears in the scientific report 2002
Notes: This version is available at the following Publisher URL: http://dx.doi.org/10.1088/0741-3335/44/9/305

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Database coverage:

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