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Dependence of Plasma irradiation energy on hydrogen isotope retention and release characteristics in damaged materials

Research Project

Project/Area Number 15K18309
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

Yajima Miyuki  核融合科学研究所, ヘリカル研究部, 助教 (70749085)

Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsタングステン / 重水素プラズマ / 水素同位体 / 照射損傷 / 中性子照射 / 昇温脱離ガス分析 / プラズマ・核融合 / 核融合 / プラズマ壁相互作用 / 拡散 / 重イオン照射
Outline of Final Research Achievements

The objective of this study is to investigate the effects of neutron (n) irradiation on hydrogen isotope transport in tungsten (W). W samples were irradiated with neutrons in a fission reactor and then exposed to high flux deuterium (D) plasma at 563 K and 773 K in a linear plasma device. The fraction of D released in a high temperature region increased with increasing exposure time. In addition, the D retention in n-irradiated W increased in proportion to the square root of the plasma exposure time. These observations were explained by increase in the penetration depth of D with filling up displacement damages acting as strong trapping sites.

Academic Significance and Societal Importance of the Research Achievements

核融合炉の実現において、中性子照射がタングステンの水素吸蔵特性に与える影響に関する系統的な実験研究は急務な課題の一つである。そのような背景の中、本研究により損傷材料中の水素同位体拡散モデルを実験的に明らかにしたことは非常に大きな成果である。また、中性子照射試料に対する重水素プラズマ曝露実験は国内初の試みであり、酸化膜の影響(試料の前処理として電解研磨を実施)やプラズマ曝露後大気開放の影響を排除することで、より核融合炉内環境に近い条件で実験を実施したという点では世界初の成果である。得られた知見は、将来の原型炉の設計および炉内トリチウム管理において、大きな貢献となると期待される。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • 2015 Research-status Report
  • Research Products

    (9 results)

All 2018 2017 2016

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results)

  • [Journal Article] Development of a Compact Divertor Plasma Simulator for Plasma-Wall Interaction Studies on Neutron-Irradiated Materials2017

    • Author(s)
      Noriyasu OHNO, Tatsuya KUWABARA, Makoto TAKAGI, Ryo NISHIMURA, Miyuki YAJIMA, Akio SAGARA, Takeshi TOYAMA, Katuya SUZUKI, Hiroaki KURISHITA, Tatsuo SHIKAMA, Yuji HATANO, Naoaki YOSHIDA
    • Journal Title

      Plasma and Fusion Research

      Volume: 12 Issue: 0 Pages: 1405040-1405040

    • DOI

      10.1585/pfr.12.1405040

    • NAID

      130006224431

    • ISSN
      1880-6821
    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Kinetics of Deuterium Penetration into Neutron irradiated Tungsten2018

    • Author(s)
      M. Yajima, Y. Hatano, N. Ohno, T. Kuwabara, T. Toyama, K. Suzuki, M. Takagi
    • Organizer
      The 23rd International Conference on Plasma Surface Interactions in Controlled Fusion Devices
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Deuterium retention in neutron irradiated tungsten-rhenium alloy and potassium-doped tungsten2018

    • Author(s)
      M. Oya, H.T. Lee, T. Yamane, A. Nakamura, H. Ito, T. Kuwabara, M. Yajima, T. Toyama, K. Suzuki, M. Takagi, N. Ohno, Y. Ueda, Y. Hatano
    • Organizer
      The 23rd International Conference on Plasma Surface Interactions in Controlled Fusion Devices
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 中性子照射されたW-Re合金とK-doped Wの水素同位体吸蔵特性2018

    • Author(s)
      大宅諒, Lee Heun Tae, 中村揚, 伊東英貴, 桑原竜弥, 矢嶋美幸, 外山健, 鈴木克弥, 高木誠, 大野哲靖, 上田良夫, 波多野雄治
    • Organizer
      第12回核融合エネルギー連合講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 重水素プラズマ照射された中性子照射損傷タングステン材の昇温脱離スペクトル詳細解析2018

    • Author(s)
      大野哲靖, 足立博昭, 桑原竜弥, 高木誠, 矢嶋美幸, 波多野雄治, 外山 健, 鈴木克弥
    • Organizer
      第12回核融合エネルギー連合講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Plasma Exposure Time Dependence of Deuterium Retention in Neutron-irradiated Tungsten2017

    • Author(s)
      M. Yajima, Y. Hatano, T. Kuwabara, T. Toyama, K. Suzuki, M. Takagi, N. Ohno
    • Organizer
      The 16th International Conference on Plasma-Facing Materials and Components (16th PFMC)
    • Place of Presentation
      Dusseldorf, Germany
    • Year and Date
      2017-05-16
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Plasma Exposure Time Dependence of Deuterium Retention in Neutron-irradiated Tungsten2017

    • Author(s)
      M. Yajima, Y. Hatano, T. Kuwabara, T. Toyama, K. Suzuki, M. Takagi, H. Adachi, N. Ohno
    • Organizer
      16th International Conference on Plasma-Facing Materials and Components 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 中性子照射を受けたタングステン中の水素同位体挙動研究の進展2017

    • Author(s)
      波多野雄治,大矢恭久,外山 健, 矢嶋美幸, 桑原竜弥, 大野哲靖
    • Organizer
      Plasma Conference 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Study of Deuterium Retention Property of Heavy Ions Beam Irradiated Tungsten Using Compact Divertor Plasma Simulator for Hot Laboratory2016

    • Author(s)
      M. Yajima, S. Masuzaki, N. Ohno, M. Tokitani, Y. Hatano, Y. Oya, S. Kondo, T. Hinoki
    • Organizer
      The 7th International Symposium of Advanced Energy Science - Frontiers of Zero Emission Energy
    • Place of Presentation
      京都
    • Year and Date
      2016-09-06
    • Related Report
      2016 Research-status Report

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Published: 2015-04-16   Modified: 2020-03-30  

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