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O: Fachverband Oberflächenphysik
O 24: Poster: Ion Beam Interaction with Surfaces and Interfaces
O 24.2: Poster
Monday, March 27, 2023, 18:00–20:00, P2/EG
Sputtering of structured tungsten model surfaces — •Martina Fellinger1, Christopher Hahn1, Christian Cupak1, Gabriele Alberti2, David Dellasega2,3, Matteo Passoni2,3, Matteo Pedroni3, Andrea Uccello3, Espedito Vassallo3, and Friedrich Aumayr1 — 1TU Wien, Institute of Applied Physics, Vienna, Austria — 2Politecnico di Milano, Department of Energy, Milan, Italy — 3Istituto per la Scienza e Tecnologia dei Plasmi, Consiglio Nazionale delle Ricerche, Milan, Italy
Erosion of first wall materials in nuclear fusion devices limits the lifetime of plasma-facing materials. In the search for materials with low sputtering yields we have investigated not only the sputtering properties of randomly rough [1] but also of oriented and nano-structured tungsten surfaces. Since oriented tungsten nano-columns have shown a favourable reduction in sputtering yield [2], we have now started also to investigate nano-pyramids. These were obtained depositing a tungsten coating on top of chemically etched silicon substrates. The pyramidal surfaces were then exposed to ion irradiation and the subsequent sputtering process was investigated in situ by using a quartz crystal microbalance measurement setup [3]. We will present the experimental results and compare them to state of the art simulations.
[1] C. Cupak et al., Appl Surf Sci 570 (2021)
[2] A. Lopez-Cazalilla et al., Phys Rev Mat 6 (2022)
[3] B. M. Berger et al., Nucl Instrum Methods Phys Res B 406 (2017)