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MM: Fachverband Metall- und Materialphysik

MM 32: Transport in Materials: Diffusion, Charge or Heat Conduction

MM 32.8: Vortrag

Donnerstag, 20. März 2025, 17:00–17:15, H22

Helium Interaction with Atomic Level Defects in TungstenStudied by Positron Annihilation Spectroscopy — •Vassily Vadimovitch Burwitz^1,2, Annemarie Kärcher^1,3, Maik Butterling⁴, Eric Hirschmann⁴, Emma Huntley², Adrian Langrehr^1,2, Maciej Oskar Liedke⁴, Lucian Mathes^1,2, Thomas Schwarz-Selinger³, Christoph Springl^1,2, Monia Vadrucci^5,6, Andreas Wagner⁴, and Christoph Hugenschmidt² — ¹TU München, School of Natural Sciences, Physikdepartment — ²TU München, MLZ — ³MPI für Plasmaphysik, Garching — ⁴HZDR, Institute of Radiation Physics — ⁵ENEA, Development of Particle Accelerators and Medical Applications, Frascati (RM), Italy — ⁶Italian Space Agency, Science and Innovation Directorate, Rome

Understanding the type and evolution of lattice defects in tungsten (W) is of interest in nuclear fusion materials research. We therefore investigated W(111) mono-crystals by positron annihilation Doppler-broadening spectroscopy (DBS) and positron annihilation lifetime spectroscopy (PALS). Both complementary methods are sensitive tools for the examination of the defect type and concentration. The literature currently lacks conclusive experimental work regarding the influence of He decoration of vacancies on PAS. We therefore irradiated samples by 4.5 MeV electrons to different damage levels in order to specifically produce mono-vacancies in W. We will present DBS and PALS measurements, both performed with a slow positron beam, before and after plasma loading with 50 eV He ions. The implantation energy is chosen low enough to prevent displacement damage.

Keywords: Tungsten; Positron Annihilation Spectroscopy; Nuclear Fusion; Helium; Vacancy Defects