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Deposited carbon layers observed in the tokamak Tore Supra have been sampled in order to quantify their deuterium content using D({3}He,p){4}He nuclear reaction analysis. The results show two trends: the D/C ratio in wetted deposited carbon layers is less than 1% and the D concentration depth profile decreases rapidly from the first micrometers of the plasma facing sub-surface to the rear surface, while the D/C ratio in shadowed deposited carbon layers reaches about 10% and shows a more constant profile along the probed depth. Using the information about D concentrations and of the maximum thickness of the different samples and with the estimated deposited areas, an estimated D inventory is found to be about 1 x 10{23}D, which is too low to account for the D retention expected for a whole long plasma discharge campaign.

Additional information

Authors: BROSSET C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);KHODJA H, Laboratoire Pierre Süe, CEA/CNRS, CEA Saclay, Gif sur Yvette(FR)
Bibliographic Reference: An article published in: Journal of Nuclear Materials, Vol. 337-339 (2005), p. 664-668
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Record Number: 200518102 / Last updated on: 2005-04-25
Original language: en
Available languages: en