Deuterium retention in MeV self-implanted tungsten: Influence of damaging dose rate

Recrystallized, polycrystalline tungsten was self-damaged by 20MeV tungsten ions up to a calculated damage dose in the damage peak of 0.23dpa. The time to acquire this dose and hence the average damaging dose rate was varied from 6×10-3 to 4×10-6dpa/s, the latter coming close to the damage dose rate expected from fusion neutrons in future devices such as ITER and DEMO. One series was conducted at 295K and one at 800K to check for possible effects of defect evolution at elevated temperature. The created damage was decorated afterwards with a deuterium plasma at low ion energy of <15eV and low flux of 6×1019D/m2 until saturation to derive a measure for the defect density that can retain hydrogen isotopes. 3He nuclear reaction analysis (NRA) was applied to derive the deuterium depth profile and the maximum concentration in the damage peak. Neither for the 295K nor for the 800K series a variation in deuterium retention with damage dose rate was found. Keywords: Tungsten, Deuterium retention, Displacement damage, Plasma, NRA, Plasma–material interactions, Ion radiation effects

Abstract licence: CC BY-NC

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