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FP7

Localization by TEM and EELS of deuterium trapping sites in CFC exposed to plasma irradiation in Tore Supra

Funded under: FP7-EURATOM

Abstract

Carbon fiber composite (CFC) Sepcarb N11 is used in the tokamak Tore Supra as plasma-facing components. To investigate the fuel retention capability of this material, a mobile sample holder was used to expose CFC N11 samples to direct irradiation by the scrape-off layer plasma of Tore Supra at fluences up to 1 × 10{25} m{-2}. Deuterium (D) elemental mapping using nuclear reaction analysis for the most-exposed CFC sample showed that D retention occurs at depths greater than 8 mu m due to the presence of deep (>3.5 mu m) local retention sites. In this work, combining transmission electron microscopy (TEM) and electron energy-loss spectroscopy (EELS), we describe at a high spatial resolution where and how D atoms are trapped in these sites. TEM experiments performed on thin cross-sections of the plasma-modified surface show evidence of the presence of a 3.5 mu m-thick deuterated amorphous carbon layer deposited on the CFC surface. We show that specific localized retention sites correspond to the filling of relatively large (~3 mu m.) and deep (at least 3 mu m below the initial CFC surface) cracks between fibres and matrix by the deuterated amorphous carbon layer.

Additional information

Authors: BERNIER N, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BROSSET C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);TSITRONE E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GUNN J P, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BOCQUET F, Université Paul Cézanne-Aix Marseille III, Marseille (FR);SAIKALAY W, Université Paul Cézanne-Aix Marseille III, Marseille (FR);KHODJA H, Laboratoire Pierre Süe, CEA Saclay, Gif-sur-Yvette (FR);ALIMOV V KH, Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow (RU)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Volume 385, Issue 3, 2009, pp. 601-605
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://dx.doi.org/doi:10.1016/j.jnucmat.2009.01.031
Record Number: 200910321 / Last updated on: 2009-09-22
Category: PUBLICATION
Original language: en
Available languages: en
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