Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 12: Magnetic Confinement / Plasma Wall Interaction I
P 12.3: Talk
Wednesday, March 30, 2022, 14:30–14:45, P-H12
Post mortem ion beam analysis of the 13C tracer experiment at Wendelstein 7-X — •Christoph Kawan1, Sebastijan Brezinsek1, Timo Dittmar1, Sören Möller1, and W7-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, D-17491 Greifswald, Germany
Future fusion reactors will operate under extreme thermal conditions. A key challenge for preserving a safe operation and low maintenance is the mitigation of erosion, transport and deposition of wall material and impurities. To analyze the deposition and transport of impurities, two dedicated experiments were carried out at the end of Wendelstein 7-X campaign 1.2b. 1.1*1021 molecules 13CH4 were injected in standard magnetic divertor configuration through a dedicated gas puff head attached to the multi purpose manipulator directly into the plasma island structures. In the second part, 4.2*1022 molecules of 13CH4 have been injected from a divertor gas injection system at a position where the magnetic island intersects with the horizontal target plate. After the experiment, the wall components were changed and parts of the test divertor unit (TDU) target elements cut for post-mortem analysis. In this work, the deposition of 13C in different locations of W7-X via 1 MeV deuteron ion beam analysis is reported.