Deuterium permeation in tungsten by mixed ion irradiation

Deuterium ion driven permeation was studied for mixed ion irradiation conditions with He and C. Addition of He greatly reduced permeation, while addition of C enhanced permeation. These phenomena are strongly temperature dependent, but both are significant around surface temperature of blankets (∼800 K). Permeation flux has very weak dependence on microstructure. These results are important for evaluation of T behavior in blanket first walls.