SMuK 2023 – scientific programme
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P: Fachverband Plasmaphysik
P 8: Plasma Wall Interaction I/HEPP IV
P 8.7: Talk
Tuesday, March 21, 2023, 18:55–19:10, CHE/0091
First trials to regenerate the surface of plasma-facing components by wire based laser metal deposition — •Jannik Tweer1, Robin Day2, Thomas Derra2, Daniel Dorow-Gerspach1, Christian Linsmeier1, Thorsten Loewenhoff1, Ghaleb Natour3,4, and Marius Wirtz1 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany — 2Fraunhofer-Institut für Produktionstechnologie IPT, 52074 Aachen, Germany — 3Forschungszentrum Jülich GmbH, Zentralinstitut für Engineering, Elektronik und Analytik (ZEA-1), 52425 Jülich, Germany — 4Lehrstuhl und Institut für Schweißtechnik und Fügetechnik, RWTH Aachen University, 52074 Aachen, Germany
The harsh conditions inside a nuclear fusion reactor put high demands on the plasma-facing materials and components. Tungsten is the preferred material for lining the inner walls of future fusion reactors. It is considered as such due to its exceptionally high melting point, excellent thermal conductivity, low tritium retention and high erosion resistance during plasma exposure. However, even plasma-facing components made of tungsten get damaged during reactor operation, thereby limiting the lifetime of these components. It is envisioned to counteract these erosion losses by local deposition of tungsten using the wire based laser metal deposition process (LMD-w). During this process new material gets fused to the substrate, enabling in-situ repair of damaged plasma-facing components. Several experiments were conducted to find suitable process parameters and methods to create layers of new material by placing several melt tracks next to each other.