The ion-driven permeation through 50 μm-thick pure tungsten foils was measured in the temperature range of 823–923K during irradiation by 200 eV/D+ ion beam with a flux of 1017–1018 D/m2s. Gas driven permeation from the deuterium background gas was observed as well. Calculations using both the analytical formula for the diffusion limited regime and the TMAP7 code gave good agreement with the experimental data. Defects with a de-trapping energy of 2.05eV were found to limit the permeation lag time in the experimental conditions.

Ion-Driven Deuterium Permeation Through Tungsten at High Temperatures. Y.M.Gasparyan, A.V.Golubeva, M.Mayer, A.A.Pisarev, J.Roth: Journal of Nuclear Materials, 2009, 390-391, 606-9