Deuterium concentration in deposited carbon layers in Tore Supra

Deposited carbon layers observed in the tokamak Tore Supra have been sampled in order to quantify their deuterium content using D(3He,p)4He 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 de...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 337-339; pp. 664 - 668
Main Authors Brosset, C., Khodja, H.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2005
Subjects
Co-deposition
Deuterium inventory
Surface analysis
Tore Supra
52.55.Fa
H0400
R0900
C0100
52.40.Hf
Co-deposition
Deuterium inventory
Surface analysis
Tore Supra
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Summary:Deposited carbon layers observed in the tokamak Tore Supra have been sampled in order to quantify their deuterium content using D(3He,p)4He 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 1×1023D, which is too low to account for the D retention expected for a whole long plasma discharge campaign.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2004.10.045