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With the recent successful operation in JET, beryllium must be considered a leading plasma-facing material. However, little is known about beryllium's hydrogen isotope retention and migration properties. This paper presents the results of a coordinated experimental programme performed to characterise the hydrogen isotope retention and release in beryllium. In the first set of experiments, measurements of the plasma-driven permeation of deuterium through beryllium membranes were conducted. No detectable permeation was obtained for temperatures below 670 K, and the higher temperature results were strongly affected by the oxide layers on the samples. In the second set of experiments, samples were exposed to a D-T plasma in the tritium plasma experiment. The samples were subsequently removed for dissolution tritium counting. The retention was seen to decrease initially with increasing exposure temperature, but reached a local maximum at 770 K.

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Authors: CAUSEY R A, Sandia National Laboratories, Livermore (US);HSU W L, Sandia National Laboratories, Livermore (US);MILLS B E, Sandia National Laboratories, Livermore (US);EHRENBERG J, JET Joint Undertaking, Abingdon, Oxon. (GB);PHILIPPS V, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 176 & 177 (1990) pp. 654-660
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