Publications in Scientific Journals:
S. Cernusca, Hp. Winter, F. Aumayr, A. Qayyum, W. Schustereder, C. Mair, P. Scheier, T. Märk:
"Edge plasma-relevant ion-surface collision processes";
International Journal of Mass Spectrometry,
Graphite tiles or carbon-coated structures are largely used as wall or divertor materials in magnetically confined fusion devices. Laboratory work on plasma-wall interaction has so far mainly focused on obtaining physical and chemical sputtering yields for such materials. Much less is known on electron emission and molecular fragmentation and reactions during ion impact on graphite surfaces, despite the fact that both processes might play a decisive role in plasma-wall interaction. We therefore have measured such data for fusion-relevant ion species (e.g., Hn+, n = 1-3 and Cz+, z = 1, 2, 4, 5) in the eV to keV impact energy region typical for fusion edge plasma conditions. As a target surface graphite tiles from the Tokamak experiment Tore Supra in CEA-Cadarache/France have been used. Implications of the experimental results for plasma edge modeling are also discussed.
Keywords: Plasma-surface interaction; Graphite; Multiply charged ion
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