skip to main content

SciTech ConnectSciTech Connect

Title: In-situ observation of sputtered particles for carbon implanted tungsten during energetic isotope ion implantation

Tungsten is a candidate for plasma facing materials in future fusion reactors. During DT plasma operations, carbon as an impurity will bombard tungsten, leading to the formation of tungsten-carbon (WC) layer and affecting tritium recycling behavior. The effect of carbon implantation for the dynamic recycling of deuterium, which demonstrates tritium recycling, including retention and sputtering, has been investigated using in-situ sputtered particle measurements. The C{sup +} implanted W, WC and HOPG were prepared and dynamic sputtered particles were measured during H{sub 2}{sup +} irradiation. It has been found that the major hydrocarbon species for C{sup +} implanted tungsten is CH{sub 3}, while for WC and HOPG (Highly Oriented Pyrolytic Graphite) it is CH{sub 4}. The chemical state of hydrocarbon is controlled by the H concentration in a W-C mixed layer. The amount of C-H bond and the retention of H trapped by carbon atom should control the chemical form of hydrocarbon sputtered by H{sub 2}{sup +} irradiation and the desorption of CH{sub 3} and CH{sub 2} are due to chemical sputtering, although that for CH is physical sputtering. The activation energy for CH{sub 3} desorption has been estimated to be 0.4 eV, corresponding to the trapping process of hydrogen bymore » carbon through the diffusion in W. It is concluded that the chemical states of hydrocarbon sputtered by H{sub 2}{sup +} irradiation for W is determined by the amount of C-H bond on the W surface. (authors)« less
Authors:
; ; ;  [1] ; ;  [2] ;  [3] ;  [4]
  1. Graduate School of Science, Shizuoka University, Shizuoka (Japan)
  2. National Institute for Fusion Science, Gifu (Japan)
  3. Institute for Applied Mechanics, Kyushu University, Kasuga (Japan)
  4. Hydrogen Isotope Research Center, University of Toyama, Toyama (Japan)
Publication Date:
OSTI Identifier:
22429755
Resource Type:
Journal Article
Resource Relation:
Journal Name: Fusion Science and Technology; Journal Volume: 67; Journal Issue: 3; Conference: TRITIUM 2013: 10. International Conference on Tritium Science and Technology, Nice Acropolis (France), 21-25 Oct 2013; Other Information: Country of input: France; 7 refs.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON IONS; DESORPTION; DEUTERIUM; D-T OPERATION; FIRST WALL; GRAPHITE; HYDROGEN; HYDROGEN IONS 2 PLUS; ION IMPLANTATION; IRRADIATION; METHANE; RECYCLING; SPUTTERING; THERMONUCLEAR FUELS; THERMONUCLEAR REACTORS; TRITIUM; TUNGSTEN; TUNGSTEN CARBIDES