Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.47: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Depth profiling X-ray photoemission investigation and its impact into the field of Fusion Energy Materials — •Stephanie Rädel1,2,3, Martin Köppen3, Martin Oberkofler3, Johann Riesch3, Heike Löchel1, Max Bauer1, Antje Vollmer1, and Christian Linsmeier3 — 1Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany — 2TU Berlin, Berlin Germany — 3Max-Planck-Institut für Plasmaphysik, Garching, Germany
The next step of the roadmap in fusion energy research is the construction of the experimental fusion reactor ITER. Due to particle collision and energy deposition in the reactor vessel, requirements for first wall materials are extremely high. Therefore it is crucial to gain knowledge on the interaction of the plasma and the surface of ITER. During operation, diffusion, erosion and re-deposition occur. For a successful operational scenario, these reactions need to be predicted. In this study we investigate selected surface processes by XPS measurements. By using synchrotron radiation, it is possible to tune photon energies (kinetic energy of photo-electrons) achieving different information depths. Following diffusion processes and chemical reactions by depth profing becomes feasible. Here we present the ternary system Be/W/C and its chemical and physical behaviour upon annealing. This understanding is a step towards predictions of the behaviour of the elements at the ITER first wall under different reaction conditions during operation.