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P: Fachverband Plasmaphysik
P 7: Theorie/Modellierung I
P 7.5: Vortrag
Dienstag, 31. März 2009, 14:15–14:30, HS Biochemie (groß)
Opacity effects in magnetic fusion plasmas — •Joël Rosato1,2, Detlev Reiter1, and Vladislav Kotov1 — 1IEF - Plasmaphysik, Forschungszentrum Jülich GmbH, TEC Euratom Association, D-52425 Jülich, Germany — 2PIIM, UMR 6633 Université de Provence / CNRS, Centre de St-Jérôme, F-13397 Marseille Cedex 20, France
In about 10 years from now magnetic fusion will provide the first controlled thermonuclear burning flame on earth (in the ITER tokamak). It has only recently been fully recognized that hydrogen line radiation absorption effects are important in magnetic fusion experiments, at least at the densest/largest plasma conditions, e.g. in Alcator C-Mod (where Ne currently attains 1015 cm-3) or in ITER [1]. As a consequence, the corresponding photoexcitation may significantly affect the ionization-recombination balance of the edge plasma. The significant impact of radiation trapping on divertor plasma dynamics for ITER has clearly been demonstrated by both simple mean free path estimates and by non-LTE-Monte-Carlo calculations of the gas- and photon transport carried out with the B2-EIRENE code. Quantitative design predictions as well as interpretation of future spectroscopy in the ITER divertor will only be possible with proper accounting for the opacity effects. In this presentation, we provide the current status of the line radiation transport modeling with B2-EIRENE, including spectral line shape (Stark-Zeeman-Doppler) and ionization-recombination balance calculations.
[1] "Progress in the ITER Physics Basis", Nucl. Fusion 47 (special issue, 2007).