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Knowledge of the migration behaviour of hydrogen isotopes in structural materials is required when the inventory and the release to the surroundings of such isotopes have to be predicted. A typical example for such predictions would be the first wall of a thermonuclear fusion reactor which is implanted with helium, deuterium and tritium. In order to determine the migration distances of deuterium in the presence of helium, helium and deuterium ions have been implanted into AISI 316 targets at different ion energies and target temperatures. Then their concentration profiles have been determined by means of either secondary ion mass spectroscopy (SIMS) or elastic recoil detection (ERD). The spectra show that the implanted helium migrates into the bulk, while the implanted deuterium remains near the surface of the implanted target. In the presence of pre-implanted helium, however, the implanted deuterium migrates away from the surface. This type of migration behaviour remains the same whether the D(+) ion is implanted at 40 keV, 100 C, or at 30 keV, 350 C. For both helium and deuterium, the effective diffusion coefficients and migration distances are significantly smaller than those predicted by classical diffusion laws.

Additional information

Authors: GAUTSCH O, JRC Ispra (IT)
Bibliographic Reference: EUR 14027 EN (1992) 15 pp., MF, ECU 4, blow-up copy ECU 6
Availability: (2)
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