The change of surface topography of plasma facing components in controlledfusion devices

Citation
M. Rubel et al., The change of surface topography of plasma facing components in controlledfusion devices, MAT SCI E A, 272(1), 1999, pp. 174-180
Citations number
42
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
272
Issue
1
Year of publication
1999
Pages
174 - 180
Database
ISI
SICI code
0921-5093(19991115)272:1<174:TCOSTO>2.0.ZU;2-C
Abstract
Surface microstructure and composition of plasma facing components from the TEXTOR tokamak are described. Surfaces of such components are drastically modified by the impact of plasma ions. This interaction results in the form ation of thick co-deposited/co-implanted layers containing a mixture of hyd rogen isotopes and plasma impurity species. The emphasis is on the characte risation of changes occurring on the graphite surface exposed for a few hou rs to a hot deuterium plasma and, afterwards, following the exposure either to air or annealing in vacuum at elevated temperatures. The investigation carried out by means of electron microscopy, energy dispersive X-ray spectr oscopy, ion beam analysis methods and laser profilometry gives evidence on the conditions under which the deuterium is released due to the oxidation o r desorption from the plasma eroded surfaces. It is also demonstrated that the oxygen-assisted removal of deuterium at 300 degrees C has rather small impact on the decomposition of thick co-deposits. (C) 1999 Elsevier Science S.A. All rights reserved.