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P: Fachverband Plasmaphysik

P 5: Poster Session- Helmholtz Graduate School for Plasma Physics

P 5.6: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Deuterium accumulation in tungsten at high fluences — •Mikhail Zibrov^1,2, Martin Balden¹, Kirill Bystrov², Thomas Morgan², and Matej Matej¹ — ¹Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching, Germany — ²FOM Institute DIFFER, De Zaale 20, 5612 AJ Eindhoven, The Netherlands

The data on the deuterium (D) retention in tungsten (W) at high fluences (≥ 10²⁷ D / m²) are scarce and the existing results are contradictory. Since retention in W is known to be flux–dependent, the laboratory experiments addressing this issue should be carried out in reactor–relevant conditions (high fluxes of low–energy ions).

In this work the samples made of polycrystalline W were exposed to D plasmas in the linear plasma generator Pilot–PSI at temperatures ranging from 360 K to 1140 K to fluences in the range of 0.3−8.7 × 10²⁷ D / m². It was observed that at exposure temperatures of 360 K and 580 K the D retention was only slightly dependent on the ion fluence. In addition, the presence of blister–like structures was found after the exposures, and their density and size distributions were also only weakly dependent on the fluence. In the case of exposure at 1140 K no surface modifications of the samples after plasma exposure were detected and the concentrations of retained D were very small. At all temperatures used the total amounts of retained D were smaller compared to those obtained by other researchers at lower ion flux densities, which indicates that the incident ion flux may play an important role in the total D retention in W.