<div class="csl-bib-body">
<div class="csl-entry">Fellinger, M., Cupak, C., Hahn, C., Alberti, G., Vavassori, D., Dellasega, D., Passoni, M., Pedroni, M., Uccello, A., Vassallo, E., & Aumayr, F. (2023, August 25). <i>Sputtering of tungsten nano-pyramids</i> [Conference Presentation]. FuseNet PhD Event 2023, Lausanne, Switzerland. http://hdl.handle.net/20.500.12708/188139</div>
</div>
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/188139
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dc.description.abstract
The lifetime of plasma facing components in nuclear fusion reactors is strongly dependent on their erosion properties [1]. Materials with lowest possible sputtering yields are therefore highly desirable. While tungsten itself is a good choice as a first wall material due to its performance [2], the question arises if erosion rates can be further reduced by specific nanostructuring of the material’s surface.
It is known that surface roughness can lower the sputtering yields. This reduction was already demonstrated for structures with Gaussian distributed height values [3, 4] and also for highly oriented structures in the form of nano-columns [5, 6]. In this work, we focus on investigating the sputtering properties of tungsten nano-pyramids, which were obtained by depositing a 500 nm tungsten coating on top of chemically etched silicon substrates. The pyramidal surfaces were exposed to 2 keV Ar+ ion bombardment and the eroded particles were collected employing a quartz crystal microbalance as a catcher. In addition, simulation programs based on the binary collision approximation were used to model the ion-solid collisions [7].
First results regarding the emission profiles show that comparably large amounts of particles are emitted backwards, towards the direction of the incoming ion beam. While this effect might partially result from the specific pyramidal topography, other possible hypotheses including crystallinity effects are also conceivable. Nevertheless, the global sputtering yield of nano-pyramids was found to be reduced by approximately 50% compared to a flat reference sample.
en
dc.language.iso
en
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dc.subject
sputtering
en
dc.subject
erosion
en
dc.subject
morphology
en
dc.subject
QCM
en
dc.title
Sputtering of tungsten nano-pyramids
en
dc.type
Presentation
en
dc.type
Vortrag
de
dc.contributor.affiliation
TU Wien, Austria
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dc.contributor.affiliation
Politecnico di Milano, Italy
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dc.contributor.affiliation
Politecnico di Milano, Italy
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dc.contributor.affiliation
Politecnico di Milano, Italy
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dc.contributor.affiliation
Politecnico di Milano, Italy
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dc.contributor.affiliation
Consiglio Nazionale delle Ricerche, Italy
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dc.contributor.affiliation
Consiglio Nazionale delle Ricerche, Italy
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dc.contributor.affiliation
Consiglio Nazionale delle Ricerche, Italy
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dc.type.category
Conference Presentation
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tuw.researchTopic.id
M2
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tuw.researchTopic.id
M1
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tuw.researchTopic.id
C6
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tuw.researchTopic.name
Materials Characterization
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tuw.researchTopic.name
Surfaces and Interfaces
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tuw.researchTopic.name
Modeling and Simulation
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tuw.researchTopic.value
30
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tuw.researchTopic.value
50
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tuw.researchTopic.value
20
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tuw.linking
https://indico.fusenet.eu/event/47
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tuw.publication.orgunit
E134-03 - Forschungsbereich Atomic and Plasma Physics
