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

Oya, Y.; Sato, M.; Uchimura, H.; Okuno, K.; Ashikawa, N.; Sagara, A.; Yoshida, N.; Hatano, Y.

doi:10.13182/FST14-T68

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

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Abstract

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 »« less

Authors:

Oya, Y.; Sato, M.; Uchimura, H.; Okuno, K. ^[1]; Ashikawa, N.; Sagara, A. ^[2]; Yoshida, N. ^[3]; Hatano, Y. ^[4]

Graduate School of Science, Shizuoka University, Shizuoka (Japan)
National Institute for Fusion Science, Gifu (Japan)
Institute for Applied Mechanics, Kyushu University, Kasuga (Japan)
Hydrogen Isotope Research Center, University of Toyama, Toyama (Japan)

Publication Date:: Sun Mar 15 00:00:00 EDT 2015

OSTI Identifier:: 22429755

Resource Type:: Journal Article

Journal Name:: Fusion Science and Technology

Additional Journal Information:: 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.; Journal ID: ISSN 1536-1055

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

Citation Formats


                    Oya, Y., Sato, M., Uchimura, H., Okuno, K., Ashikawa, N., Sagara, A., Yoshida, N., and Hatano, Y. In-situ observation of sputtered particles for carbon implanted tungsten during energetic isotope ion implantation.  United States: N. p., 2015. 
        Web.  doi:10.13182/FST14-T68.

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                    Oya, Y., Sato, M., Uchimura, H., Okuno, K., Ashikawa, N., Sagara, A., Yoshida, N., & Hatano, Y. In-situ observation of sputtered particles for carbon implanted tungsten during energetic isotope ion implantation.  United States.  https://doi.org/10.13182/FST14-T68

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                    Oya, Y., Sato, M., Uchimura, H., Okuno, K., Ashikawa, N., Sagara, A., Yoshida, N., and Hatano, Y. 2015.  
        "In-situ observation of sputtered particles for carbon implanted tungsten during energetic isotope ion implantation".  United States.  https://doi.org/10.13182/FST14-T68.

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@article{osti_22429755,

  title        = {In-situ observation of sputtered particles for carbon implanted tungsten during energetic isotope ion implantation},

  author       = {Oya, Y. and Sato, M. and Uchimura, H. and Okuno, K. and Ashikawa, N. and Sagara, A. and Yoshida, N. and Hatano, Y.},

  abstractNote = {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 by 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)},

  doi          = {10.13182/FST14-T68},

  url          = {https://www.osti.gov/biblio/22429755},
  journal      = {Fusion Science and Technology},

  issn         = {1536-1055},

  number       = 3,

  volume       = 67,

  place        = {United States},

  year         = {Sun Mar 15 00:00:00 EDT 2015},

  month        = {Sun Mar 15 00:00:00 EDT 2015}

}

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