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C. Cupak:
"Influence of Roughness on Sputtering Yields of Surfaces under Ion Bombardment";
Vortrag: Seminar Institut für Allgemeine Physik (IAP), TU Wien; 16.11.2021.

In nuclear fusion devices, the first wall of the reactor is under continuous bombardment by plasma ions. One effect of this bombardment is erosion on the atomic scale, called sputtering. Especially the roughness of the irradiated materials remained a challenging property, which can affect the sputtering yield severely. To better understand this roughness effect, both experiments with a Quartz Crystal Microbalance (QCM) and simulations with the new code SPRAY were performed for samples with very different roughness. A main result was the identification of a new roughness parameter, being the mean surface inclination angle, allowing much better characterisation than other parameters like e.g., the root mean square roughness.