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Article Dans Une Revue Journal of Nuclear Materials Année : 2015

Dynamic fuel retention in tokamak wall materials: An in situ laboratory study of deuterium release from polycrystalline tungsten at room temperature

Résumé

Retention of deuterium ion implanted in polycrystalline tungsten samples is studied in situ in an ultra-high vacuum apparatus equipped with a low-flux ion source and a high sensitivity thermo-desorption setup. Retention as a function of ion fluence was measured in the 10^17 -10^21 D+/m^2 range. By combining this new fluence range with the literature in situ experimental data, we evidence the existence of a retention = fluence^ 0.645±0.025 relationship which describes deuterium retention behavior on polycrystalline tungsten on 8 orders of magnitude of fluence. Evolution of deuterium retention as a function of the sample storage time in vacuum at room temperature was followed. A loss of 50% of the retained deuterium is observed when the storage time is increased from 2 h to 135 h. The role of the surface and of natural bulk defects on the deuterium retention/release in polycrystalline tungsten is discussed in light of the behavior of the single desorption peak obtained with Temperature Programmed Desorption.
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hal-01230492 , version 1 (26-01-2016)

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Paternité - Pas d'utilisation commerciale - Pas de modification

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Régis Bisson, S Markelj, O Mourey, F Ghiorghiu, K Achkasov, et al.. Dynamic fuel retention in tokamak wall materials: An in situ laboratory study of deuterium release from polycrystalline tungsten at room temperature. Journal of Nuclear Materials, 2015, theme issue “Models and Data for Plasma-Material Interaction in Fusion Devices“, 467 (1), pp.432. ⟨10.1016/j.jnucmat.2015.07.028⟩. ⟨hal-01230492⟩
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