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P: Fachverband Plasmaphysik
P 8: Plasma Wall Interaction I/HEPP IV
P 8.6: Vortrag
Dienstag, 21. März 2023, 18:40–18:55, CHE/0091
Experimental Determination of Irradiation-Induced Stress Relaxation in Thin Tungsten Wires — •Alexander Feichtmayer1,2, Max Boleininger3, Raphael Colson1,2, Bailey Curzadd1,2, Sebastian Estermann1,2, Till Höschen1, Johann Riesch1, Thomas Schwarz-Selinger1, and Rudolf Neu1,2 — 1Max Planck Institute for Plasma Physics, Boltzmannstr. 2, 85748 Garching, Germany — 2Technical University Munich, Boltzmannstr. 15, 85748 Garching, Germany — 3Culham Centre for Fusion Energy, Abingdon, OX14 3DB, Oxfordshire, UK
The development of suitable materials for the highly loaded plasma facing components is a major challenge in the development of a future fusion power plant. The influence of neutron irradiation on the mechanical properties is particularly difficult to measure, since there is no suitable neutron source available. A widely used technique to simulate neutron irradiation is the use of high energy ions, since these can produce similar dislocation damage as neutrons. For this purpose, a dedicated device has been developed to allow simultaneous ion irradiation as well as mechanical testing. This device and the latest upgrades, as for example a laser-based strain measurement system, will be presented. The setup of a stress relaxation experiment on 16 µm tungsten wires, to study the synergistic effects between mechanical stress and irradiation damage, will also be presented. For this the wires were preloaded with up to 2 GPa and simultaneously irradiated with 20.3 MeV tungsten ions. The resulting force drop (10-30 mN) and the ion current across the sample (0.1-0.8 nA) was measured.