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Abstract

Deposition, retention and in-depth penetration of deuterium was investigated in carbon fibre composites (CFC). Comparative studies were also performed for isotropic graphite and carbon-silicon (5 or 20 % Si) composites. The materials were exposed to fluxes of deuterium in a hollow cathode device and in the TEXTOR tokamak. Nuclear reaction analysis, Rutherford backscattering spectroscopy, laser profilometry, and crystallographic as well as microscopic methods were applied, and thermal and ion induced release were studied. The results revealed a systematic decrease of the deuterium content in the near surface layer of CFC substrates exposed to the hollow cathode plasma. Moreover, in these samples a pronounced content of deuterium, even 60 times higher than the background level, was found beneath the exposed surface indicating deep penetration of D atoms through the layered structure of CFC. Thermally stimulated desorption at 1100 C resulted in the release of more than 99.9 % of D atoms from the substrate. The disappearance of deuterium was accompanied by topographical changes of the surface layer as observed by scanning electron microscopy.

Additional information

Authors: RUBEL M, Manne Siegbahn Institute of Physics, Stockholm (SE);EMMOTH B, Manne Siegbahn Institute of Physics, Stockholm (SE);BERGSAKER H, Manne Siegbahn Institute of Physics, Stockholm (SE);WIENHOLD P, Forschungszentrum Jülich GmbH, Institut für Plasmaphysik (DE);DUNAEV V, St. Petersburg University, Department of Physics (SU);SUKHOMLINOV V, St. Petersburg University, Department of Physics (SU)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 196-198 (1992) pp. 285-291
Record Number: 199310263 / Last updated on: 1994-11-29
Category: PUBLICATION
Original language: en
Available languages: en
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