Ion-driven deuterium permeation through tungsten at high temperatures

The ion-driven permeation (IDP) through 50 μm thick pure tungsten foils was measured in the temperature range of 823–923 K during irradiation by 200 eV/D+ ion beam with a flux of 1017–1018 D/m2s. Gas driven permeation (GDP) from the deuterium background gas was observed as well. Calculations using both the analytical formula for the diffusion limited regime (DLR) and the TMAP 7 code gave good agreement with the experimental data. Defects with a detrapping energy of (2.05 ± 0.15) eV were found to limit the permeation lag time in our experimental conditions.