Measurement of hydrogenic retention and release in molybdenum with the DIONISOS experiment

G.M. Wright; D.G. Whyte; B. Lipschultz

doi:10.1016/j.jnucmat.2009.01.092

Measurement of hydrogenic retention and release in molybdenum with the DIONISOS experiment

G.M. Wright, D.G. Whyte, B. Lipschultz

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Molybdenum targets are exposed in the DIONISOS experiment to a deuterium (D) plasma (Γ ∼ 10 m s) at target biases of 30-350 V and target temperatures of 300-700 K while simultaneously diagnosing the D in the surface with a 3.5 MeV He ion beam. The He diagnostic beam creates displacements in the Mo lattice which can then trap D, allowing retention far beyond the plasma ion implantation range. The conversion of displacements to trap sites averaged over the ion range is non-linear with a scaling (dpa), 0.25 ≤ α ≤ 0.5. The beam-induced traps are distributed from the surface to the end of range as opposed to the damage (dpa) profile that is concentrated at the end of range. Measurement of the near-surface D time-dependence has allowed inference of an effective surface recombination rate, which is lower than predicted by theory and at the low end of those found in literature.

Original language	English
Pages (from-to)	544-549
Number of pages	6
Journal	Journal of Nuclear Materials
Volume	390-391
Issue number	1
DOIs	https://doi.org/10.1016/j.jnucmat.2009.01.092
Publication status	Published - 15 Jun 2009

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10.1016/j.jnucmat.2009.01.092

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abstract = "Molybdenum targets are exposed in the DIONISOS experiment to a deuterium (D) plasma (Γ ∼ 10 m s) at target biases of 30-350 V and target temperatures of 300-700 K while simultaneously diagnosing the D in the surface with a 3.5 MeV He ion beam. The He diagnostic beam creates displacements in the Mo lattice which can then trap D, allowing retention far beyond the plasma ion implantation range. The conversion of displacements to trap sites averaged over the ion range is non-linear with a scaling (dpa), 0.25 ≤ α ≤ 0.5. The beam-induced traps are distributed from the surface to the end of range as opposed to the damage (dpa) profile that is concentrated at the end of range. Measurement of the near-surface D time-dependence has allowed inference of an effective surface recombination rate, which is lower than predicted by theory and at the low end of those found in literature.",

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AU - Whyte, D.G.

AU - Lipschultz, B.

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AB - Molybdenum targets are exposed in the DIONISOS experiment to a deuterium (D) plasma (Γ ∼ 10 m s) at target biases of 30-350 V and target temperatures of 300-700 K while simultaneously diagnosing the D in the surface with a 3.5 MeV He ion beam. The He diagnostic beam creates displacements in the Mo lattice which can then trap D, allowing retention far beyond the plasma ion implantation range. The conversion of displacements to trap sites averaged over the ion range is non-linear with a scaling (dpa), 0.25 ≤ α ≤ 0.5. The beam-induced traps are distributed from the surface to the end of range as opposed to the damage (dpa) profile that is concentrated at the end of range. Measurement of the near-surface D time-dependence has allowed inference of an effective surface recombination rate, which is lower than predicted by theory and at the low end of those found in literature.

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Measurement of hydrogenic retention and release in molybdenum with the DIONISOS experiment

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