Deuterium trapping in ion-damaged tungsten single crystal

The trapping of plasma-induced deuterium in tungsten single crystal pre-irradiated with high-energy ions of H, D and He and then annealed at 1000 K has been studied by thermal desorption spectroscopy. Ion energies well higher and below the threshold of damage production were used for damage and probe irradiation, respectively. It has been shown that D retention in H and D-damaged tungsten crystals correlates with a damage level of these crystals that was calculated by using TRIM program. At the same time, at about the same damage level, D trapping in He-damaged tungsten was about 4 times more than in D-damaged tungsten. The results obtained are connected with some peculiarities of clustering and deuterium trapping in ion-damaged tungsten crystals.