Bremen 2017 – scientific programme

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P: Fachverband Plasmaphysik

P 15: Helmholtz Graduate School II

P 15.12: Poster

Tuesday, March 14, 2017, 16:30–18:30, HS Foyer

Deuterium retention in tungsten damaged by MeV ions — •Barbara Wielunska^1,2, Matej Mayer¹, and Thomas Schwarz-Selinger¹ — ¹Max-Planck-Institut für Plasmaphysik, Boltzmannstr.2, 85748 Garching — ²Physik Departement, E28, TUM, 85748 Garching

Tungsten is a promising candidate material for the wall of a future fusion reactor due to its low erosion yield and low hydrogen solubility. However, fusion neutron irradiation will cause defects in the material which can strongly increase hydrogen retention. Therefore it is important to study the mechanism of defect creation and hydrogen retention in tungsten. Neutron irradiation is often simulated by different ion species. It is not yet clear which ion species cause comparable damage cascades as neutrons. Therefore samples of hot rolled, polished tungsten were implanted with different ion species (p, D, He, Si, Fe, Cu, W) at energies between 0.3 and 20 MeV to damage levels of 0.04 and 0.5 dpa. To study the hydrogen retention in defects, the samples were exposed to a low temperature deuterium (D) plasma to decorate the defects. To obtain the D depth distribution nuclear reaction analysis using the reaction D(3He, p)α was performed. Trapped D was released by controlled heating of the sample and monitoring the amount of released D (thermal desorption spectroscopy). D release differs depending on the implanted ion species which might be a result of the different damage cascades. The results of these studies will be presented.