Bremen 2017 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Helmholtz Graduate School II
P 15.21: Poster
Dienstag, 14. März 2017, 16:30–18:30, HS Foyer
Investigation of deuterium interaction with lattice defects in tungsten — •Mikhail Zibrov1, Matej Mayer1, Armin Manhard1, and Dmitry Terentyev2 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2SCK CEN, Mol, Belgium
Although the database on hydrogen (H) isotopes behaviour in tungsten (W) is rather wide, some of the fundamental aspects of the hydrogen-defect interaction are not well understood yet. The aim of this study is to investigate the H interaction with various lattice defects in W by using specially prepared samples having one dominant and well-known defect type.
In order to create mainly vacancies, single crystalline W samples were damaged by 200 keV protons to low damage levels. Then the samples were annealed at temperatures in the range of 500-1300 K to study the stages of vacancy clustering. In order to introduce mainly dislocations, recrystallized W samples were subjected to tensile plastic deformations at elevated temperatures to different levels. All the samples were then exposed to a low-flux low-energy D plasma in order to decorate the defects with deuterium (D) without producing additional damage. The D inventory in the samples was then characterized by nuclear reaction analysis (NRA) and thermal desorption spectroscopy (TDS). It was observed that single vacancies contribute to a peak near 600 K in the TDS spectra. Annealing at temperatures above 700 K led to agglomeration of vacancies in vacancy clusters, which was manifested by a disappearance of the peak near 600 K and appearance of a new peak near 750 K.