Research output: Contribution to journal › Article › peer-review
DEPOSITION AND IN-DEPTH PENETRATION OF DEUTERIUM IN CARBON-FIBER COMPOSITES. / RUBEL, M; EMMOTH, B; BERGSAKER, H; WIENHOLD, P; DUNAEV, V.; SUKHOMLINOV, S. V.
In: Journal of Nuclear Materials, Vol. 196, 12.1992, p. 285-291.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - DEPOSITION AND IN-DEPTH PENETRATION OF DEUTERIUM IN CARBON-FIBER COMPOSITES
AU - RUBEL, M
AU - EMMOTH, B
AU - BERGSAKER, H
AU - WIENHOLD, P
AU - DUNAEV, V.
AU - SUKHOMLINOV, S. V.
PY - 1992/12
Y1 - 1992/12
N2 - 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. The irradiated targets were studied by a number of techniques in order to characterize their surface composition and structure. Nuclear reaction analysis, Rutherford backscattering spectroscopy, laser profilometry, crystallographic as well as microscopic methods were applied, and thermally and ion induced release were studied. The studies performed in several time steps revealed a systematic decrease of the deuterium content in the near surface layer (1.5 mum thick) of CFC substrates exposed to the hollow cathode plasma: from 6.8 X 10(18) cm-2 to 4.18 X 10(18) cm-2 and 3.76 X 10(18) cm-2 after 1, 81 and 112 days following the exposure, respectively. 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-degrees-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.
AB - 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. The irradiated targets were studied by a number of techniques in order to characterize their surface composition and structure. Nuclear reaction analysis, Rutherford backscattering spectroscopy, laser profilometry, crystallographic as well as microscopic methods were applied, and thermally and ion induced release were studied. The studies performed in several time steps revealed a systematic decrease of the deuterium content in the near surface layer (1.5 mum thick) of CFC substrates exposed to the hollow cathode plasma: from 6.8 X 10(18) cm-2 to 4.18 X 10(18) cm-2 and 3.76 X 10(18) cm-2 after 1, 81 and 112 days following the exposure, respectively. 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-degrees-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.
KW - 1ST WALL
KW - GRAPHITE
KW - PLASMA
KW - HYDROGEN
KW - CALIBRATION
KW - TRANSPORT
KW - TOKAMAKS
KW - SILICON
KW - FLUX
M3 - статья
VL - 196
SP - 285
EP - 291
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -
ID: 9656751