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Dynamics of ion irradiation defects

Research Project

Project/Area Number 09680492
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear fusion studies
Research InstitutionOsaka University

Principal Investigator

UEDA Yoshio  Graduate School of Engineering, Osaka University, Associate Professor, 大学院・工学研究科, 助教授 (30193816)

Co-Investigator(Kenkyū-buntansha) OHTSUKA Yosuke  Graduate School of Engineering, Osaka University, Research Associate, 大学院・工学研究科, 助手 (70294048)
ISOBE Michiro  Graduate School of Engineering, Osaka University, Research Associate, 大学院・工学研究科, 助手 (40243167)
NISHIKAWA Masahiro  Graduate School of Engineering, Osaka University, Professor, 大学院・工学研究科, 教授 (50029287)
Project Period (FY) 1997 – 1998
Project Status Completed (Fiscal Year 1998)
Budget Amount *help
¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordsion irradiation defects / radiation enhanced sublimation / chemical sputtering / high flux / graphite / boron-doped graphite / silicon-doped graphite / flux dependence / 高粒子束ビーム
Research Abstract

We have investigated radiation enhanced sublimation of graphite and chemical sputtering of graphite under high flux beam irradiation (up to 10ィイD122ィエD1 mィイD1-2ィエD1sィイD1-1ィエD1) to study the dynamics of ion irradiation defects and its effects on the above-mentioned erosion processes of graphite. The obtained results are as follows :
1. Radiation enhanced sublimation of isotropic graphite was investgated with 5keV Ar beam with the flux up to 10ィイD121ィエD1mィイD1-2ィエD1sィイD1-1ィエD1). It is found that as irradiation flux exceeds 10ィイD120ィエD1mィイD1-2ィエD1sィイD1-1ィエD1 erosion yield decreases rapidly with flux as ΦィイD1-0.26ィエD1 (Φ : flux). This flux dependence is much stronger than the previous low flux results (< 10ィイD120ィエD1mィイD1-2ィエD1sィイD1-1ィエD1, ΦィイD1-0.1ィエD1). According to self-interstitial diffusion theory, flux dependence of erosion yield of radiation enhanced sublimation might be elucidated provided that sinks for interstitials are stable defects for low irradiation flux (< 10ィイD120ィエD1mィイD1-2 … More ィエD1sィイD1-1ィエD1) and vacancies for high irradiation flux (>10ィイD120ィエD1mィイD1-2ィエD1sィイD1-1ィエD1).
2. Measurements of chemically sputtered methane (CDィイD24ィエD2) were made with 5 keV DィイD3+(/)3ィエD3 beam irradiation by a quadrupole mass analyser installed in a differential pumping chamber. Samples were isotropic graphite (JG-430), CFC graphite (CX2002), boron-doped graphite (GB series, boron content 0% to 20%), and silicon-doped graphite (TS processed graphite). It is found that peak temperature at which methane signals took maximum increased with flux up to about 1000 K. This temperature was not observed previously (less than 850 K) and could be considered as a high flux effect. In addition, methane yield (methane signal divided by flux) did not show flux dependence. These results are not consistent with a typical chemical sputtering model made by Roth et al. under the assumption that the annealing effects of graphite prevents methyl group formation above the temperature of 800 K. Chemical sputtering yield of boron-doped graphite is reduced by about a factor of 3 compared with pure graphite samples. For silicon-doped graphite with the atomic ration of about 1/1. Chemical sputtering was almost suppressed. Less

Report

(3 results)
  • 1998 Annual Research Report   Final Research Report Summary
  • 1997 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Y.Ohtsuka et al.: "Erosion of Pyrolytic Graphite and Ti-doped Graphite due to High Flux Irradiation"Journal of Nuclear Science and Technology. 34. 792-798 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Ueda et al.: "Detailed Study of Radiation Enhansed Sublimation of Graphite under High Flux Beam Irradiation"Fusion Engineering and Design. 41. 55-61 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Ueda et al.: "Erosion and Surface Morphology of Graphtie Materials under High Flux Beam Irradiation"Journal of Nuclear Materials. 258-263. 628-633 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Nishikawa: "High Flux Dependence of Erosion and Retention in Beam Experiments and its Significance to Fusion Systems"Fusion Engineering and Design. 41. 47-53 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M.Isobe et al.: "Steady State Wall Pumping Performance of Pebble Drop Divertor"Journal of Nuclear Materials. 258-263. 745-749 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Ohtsuka et al: "Boron Ion Particles Sputtered from Boron Films Deposited on Graphites"Journal of Nuclear Materials. 258-263. 735-739 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Ohtsuka et al.: "Erosion of Pyrolytic Graphite and Ti-doped Graphite due to High Flux Irradiation"J. Nucl. Mater.. 34. 792-798 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Ueda et al.: "Detailed Study of Radiation Enhanced Sublimation of Graphite under High Flux Beam Irradiation"Fusion Eng. Des.. 41. 55-61 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Ueda et al.: "Erosion and Surface Morphology of Graphtie Materials under High Flux Beam Irradiation"J. Nucl. Mater.. 258-263. 628-633 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Nishikawa: "High Flux Dependence of Erosion and Retention in Beam Experiments and its Significance to Fusion Systems"Fusion Eng. Des.. 41. 47-53 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] M. Isohe et al.: "Steady State Wall Pumping Performance of Pebble Drop Divertor"J. Nucl. Mater.. 258-263. 745-749 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y. Ohtsuka et al.: "Boron Ion Particles Sputtered from Boron Films Deposited on Graphites"J. Nucl. Mater.. 258-263. 735-739 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1998 Final Research Report Summary
  • [Publications] Y.Ohtsuka et al.: "Erosion of Pyrolytic Graphite and Ti-Doped Graphite due to High Flux Irradiation" Journal of Nuclear Science and Technology. 34. 792-798 (1997)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Ueda et al.: "Detailed Study of Radiation Enhanced Sublimation of Graphite under High Flux Beam Irradiation" Fusion Engineering and Design. 41. 55-61 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Ueda et al.: "Erosion and Surface Morphology of Graphtie Materals under High Flux Beam Irradiation" Journal of Nuclear Materals. 258-263. 628-633 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Nishikawa: "High Flux Dependence of Erosion and Retention in Beam Experiments and its significance to Fusion Systems" Fusion Engineering and Design. 41. 47-53 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] M.Isobe et al.: "Steady State Wall Pumping Performance of Pebble Drop Divertor" Journal of Nuclear Materials. 258-263. 745-749 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Ohtsuka et al.: "Boron Ion Particles Sputtered from Boron Films Deposited on Graphites" Journal of Nuclear Materials. 258-263. 735-739 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] Y.Ueda et al.: "Detailed Study of Radiation Enhanced Sublimation of Graphite under High Flux Beam Irradiation" Fusion Engineering and Design. (to be published).

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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