Göttingen 2025 – scientific programme

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.21: Poster

Wednesday, April 2, 2025, 16:15–18:15, ZHG Foyer 1. OG

Influence of the presence of deuterium on damage evolution in tungsten — •Z Shen, T Schwarz-Selinger, M Zibrov, and A Manhard — Max-Planck-Institut für Plasmaphysik, Boltzmannstrasse 2, Garching D-85748, Germany

The influence of the presence of deuterium (D) on damage evolution at elevated temperatures was studied for self-ion irradiated tungsten (W). W samples were irradiated by 20.3 MeV W ions at room temperature to the peak damage dose of 0.23 dpa and loaded with a low-temperature D plasma at 370 K to decorate the created defects. To study the evolution of the defects with D being present, samples were heated during plasma loading to 4 different temperatures, ranging from 470 K to 770 K. The annealing time was calculated by the rate equation modelling code TESSIM-X. For comparison, annealing experiments at each temperature were carried out also in vacuum. Nuclear reaction analysis (NRA) was used to determine the D depth profile and thermal desorption spectroscopy (TDS) was used to measure the total retention and de-trapping energy of D. Decorating the samples after annealing again with the same D plasma at room temperature shows decreased D retention with increasing annealing temperature both for plasma annealing and vacuum annealing. The presence of D during annealing has only a small stabilization effect for the defects.

Keywords: Defect stabilization; Deuterium retention; Annealing; Displacement damage