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Up take and release characteristics of hydrogen isotopes in re-deposited layers on the plasma facing wall

Research Project

Project/Area Number 16560720
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

NAGATA Shinji  Tohoku University, Institute for Materials Research, Associate Professor, 金属材料研究所, 助教授 (40208012)

Co-Investigator(Kenkyū-buntansha) TSUCHIYA Bun  Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (90302215)
TOH Kentaro  Tohoku University, Institute for Materials Research, Research Associate, 金属材料研究所, 助手 (40344717)
SHIKAMA Tatsuo  Tohoku University, Institute for Materials Research, Professor, 金属材料研究所, 教授 (30196365)
YAMAMOTO Shunya  Japan Atomic Energy Agency, Takasaki Advanced Radiation Research Institute, Chief Researcher, 高崎量子応用研究所, 研究副主幹 (70354941)
高広 克己  京都工芸繊維大学, 工芸学部, 助教授 (80236348)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2005: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2004: ¥2,300,000 (Direct Cost: ¥2,300,000)
Keywordsplasma facing materials / re-deposited layer / sputtering / tungsten / hydrogen isotopes / oxides / ion irradiation / optical properties / 再堆環層 / レーザーアブレーション / 希ガス
Research Abstract

In the present study, up-take, retention and release characteristics of hydrogen isotopes were studied on the W and Mo, which are promising candidates for plasma facing materials. W and Mo single crystalline disks were made by the floating zone melting method. As a simulation of the re-deposition layers, tungsten films were prepared by a conventional rf magnetron sputtering with a W target in defined Ar/O2 mixture, at a temperature range between 300 and 900 K. The micro structure of the deposited films strongly depended on the substrate temperature and oxygen concentration. The highly oriented films prepared at the substrate temperature above 800 K exhibit good gasochromic properties for hydrogen gas exposure. However, hydrogen retention was not significantly affected by the composition of oxides and the micro structure of the deposited layer. Hydrogen accumulation in W surface irradiated by noble gas ions was examined in connection with morphological and compositional changes. Remarkable hydrogen retention was found for the He and Xe ion implanted layers where blisters and exfoliation were created. Tungsten oxides such as WO2 were formed along projected ranges of the implanted ions. The results indicated that the porous oxide surface layers play an important role for dissociation of hydrogen, and hydrogen trapping is correlated with microstructural changes owing to the formation of bubbles and clusters of implanted noble gas atoms. Preferential up-take of H atoms was found in the He saturated layer, when the specimen was exposed to the atmosphere mainly containing D_2 and D_2O gas ; the up-take rate for H was an order of magnitude higher than that for D during D_2 gas exposure. The observed isotope effects on the up-take behavior might be due to the proton conductive oxides formed on the He irradiated surface of the W and Mo.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (16 results)

All 2006 2005 2004 Other

All Journal Article (16 results)

  • [Journal Article] Hydrogen up-take in noble gas implanted W2006

    • Author(s)
      S.Nagata, ほか
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B 242

      Pages: 553-556

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Gasochromic Property of Oriented Tungsten Oxide Thin Film2006

    • Author(s)
      A.Inouye, ほか
    • Journal Title

      Transactions of the Materials Research Society of Japan 31・1

      Pages: 227-230

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hydrogen up-take in noble gas implanted W2006

    • Author(s)
      S.Nagata et al.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B 242

      Pages: 553-556

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Gasochromic Property of Oriented Tungsten Oxide Thin Film2006

    • Author(s)
      A.Inouye et al.
    • Journal Title

      Transactions of the Materials Research Society of Japan 31

      Pages: 227-230

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hydrogen up-take in noble gas implanted W2006

    • Author(s)
      S.Nagata ほか
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B 242

      Pages: 553-336

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effects of ion beam modification on absorption and transport of hydrogen in perovskite-type oxide ceramics2006

    • Author(s)
      B.Tsuchiya ほか
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section B 242

      Pages: 588-590

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Gasochromic Property of Oriented Tungsten Oxide Thin Film2006

    • Author(s)
      A.Inouye ほか
    • Journal Title

      Transactions of the Materials Research Society of Japan 31・1

      Pages: 227-230

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effects of hydrogen and hydroxyl on ion beam induced luminescence of ceramics2005

    • Author(s)
      S.Nagata, ほか
    • Journal Title

      JAERI-Review 2005・001

      Pages: 256-258

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Compatibility of Lithium Oxide Single Crystals with Tungsten Sputtered Films2005

    • Author(s)
      S.Nasu, ほか
    • Journal Title

      J.Jpn. Soc. Powder Powder Metallurgy 52・6

      Pages: 427-429

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The effect of co-deposition of hydrogen and metals on wall pumping in long duration plasma in TRIAM-1M.2005

    • Author(s)
      M.Miyamoto, ほか
    • Journal Title

      Journal of Nuclear Materials 337-339

      Pages: 436-440

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Compatibility of Lithium Oxide Single Crystals with Tungsten Sputtered Films.2005

    • Author(s)
      S.Nasu et al.
    • Journal Title

      J.Jpn.Soc.Powder Powder Metallurgy 52(6)

      Pages: 427-429

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] The effect of co-deposition of hydrogen and metals on wall pumping in long duration plasma in TRIAM-1M2005

    • Author(s)
      M.Miyamoto et al.
    • Journal Title

      Journal of Nuclear Materials 337-339

      Pages: 436-440

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Effects of hydrogen and hydroxyl on ion beam induced luminescence of ceramics2005

    • Author(s)
      S.Nagata et al.
    • Journal Title

      JAERI-Review 2005-001

      Pages: 256-258

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hydrogen up-take in gas ion implantation induced porous surface layers2004

    • Author(s)
      S.Nagata, ほか
    • Journal Title

      JAERI-Review 2004・025

      Pages: 205-207

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hydrogen up-take in gas ion implantation induced porous surface layers2004

    • Author(s)
      S.Nagata et al.
    • Journal Title

      JAERI-Review 2004-025

      Pages: 205-207

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Hydrogen up-take in noble gas implanted W

    • Author(s)
      S.Nagata ほか
    • Journal Title

      Nucl.Instr.Meth.in Phys.Res.B (印刷中)

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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