Implantation energy dependence on deuterium retention behaviors for the carbon implanted tungsten

Effects of energetic carbon implantation on deuterium retention behavior in tungsten were studied. The dislocation loops and vacancies were introduced in tungsten as irradiation damages by energetic carbon implantation. The density of irradiation damages was almost saturated by C+ implantation below 1 dpa according to TEM observations. The retentions of deuterium trapped by dislocation loops and vacancies were observed in TDS measurements, which were increased as increasing the carbon implantation energy. The deuterium desorption at higher temperature above 600 K was also found, corresponding to the desorption of deuterium retained in the intrinsic cavity in bulk region. However, this trapping was refrained by energetic C+ implantation, concluding that the retained carbon would play a role as the diffusion barrier of deuterium, which would prevent deuterium penetration through bulk. (author)