Erlangen 2018 – scientific programme

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P: Fachverband Plasmaphysik

P 3: Plasma Wall Interactions I / Astrophysical Plasmas

P 3.4: Talk

Monday, March 5, 2018, 14:45–15:00, A 0.112

The impact of carbon and oxygen impurities on the effective charge state distribution in Wendelstein 7-X — •Jörg Cosfeld¹, Michael Rack¹, Detlev Reiter¹, Yühe Feng², and Wendelstein 7-X Team² — ¹Forschungszentrum Jülich GmbH, Institut für Energie und Klimaforschung Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany — ²Max-Planck-Institut für Plasmaphysik, 17491 Greifswald / 85748 Garching, Germany

Carbon and Oxygen have been identified as the two major impurities in the first divertor operation phase of the stellarator Wendelstein 7-X (W7-X). We present a computational approach to evaluate basic differences between these impurities regarding the effective charge state profile in the boundary region. The three dimensional interpretation tool EMC3-EIRENE [1][2] is applied, to isolate computationally the plasma responses caused by the strong inflows of Carbon and Oxygen, respectively, from other unknown plasma properties.

Here, differences for a plasma containing Carbon impurities, a plasma containing Oxygen impurities and a combination of both are evaluated. Free parameters considered for this study are the spatial location of impurity sources, plasma material interaction coefficients (mainly sputtering coefficients) and further free simulation parameters. An overview of the influence on plasma parameters like 3D density and temperature distributions is given.

[1] Y. Feng et al. J. Nucl. Mater. 266-269, 812, (1999)

[2] D. Reiter et al. Fusion Sci. Technol. 47, 172-186, (2005)