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Effects of He bubbles on erosion and retention on divertor by molecular simulation considering thermal processes

Research Project

Project/Area Number 18K13528
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionYamagata University

Principal Investigator

Saito Seiki  山形大学, 大学院理工学研究科, 准教授 (40725024)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywords分子過程 / プラズマ対向壁 / 核融合 / 水素リサイクリング / 分子動力学法 / タングステン / 振動・回転準位 / ヘリウムバブル / 拡散 / 中性子遮蔽 / ダイバータ / プラズマ‐材料相互作用 / スパッタリング / リテンション
Outline of Final Research Achievements

In magnetic confinement devices such as ITER and LHD, the transport of hydrogen atoms and molecules in the edge plasma has a significant role on the refueling and plasma confinement performance for core plasma. Plasma particles are transported to the core plasma through repeated recombination and ionization in edge plasma. It is known that the rate coefficients of molecular active recombination, represented by dissociative and charge exchange recombination, strongly depend on the vibrational and rotational states of the molecules. Therefore, in this study, the translational, vibrational, and rotational energies and the distribution of vibrational and rotational levels of hydrogen atoms and molecules emitted from the tungsten wall are calculated by molecular dynamics simulation.

Academic Significance and Societal Importance of the Research Achievements

近年、持続可能な開発目標としてSDGsの達成が求められているが、核融合発電技術は、エネルギー枯渇の心配が無く安全な発電技術として注目されている。その一方式である磁場閉じ込め核融合方式において、炉心プラズマの性能を維持しつつ炉壁への負荷を下げる方法として周辺プラズマの非接触化が進められている。炉壁から放出される水素分子が関与する再結合過程が非接触化した周辺プラズマの挙動に大きく影響する可能性が示唆されている。本研究により、炉壁から放出される水素分子の振動・回転準位が得られたことで、中性粒子輸送過程をより正確に計算でき、非接触化した周辺プラズマ挙動を理解する一助となる。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (30 results)

All 2022 2021 2020 2019 2018 Other

All Journal Article (11 results) (of which Open Access: 5 results,  Peer Reviewed: 10 results) Presentation (18 results) (of which Int'l Joint Research: 15 results,  Invited: 3 results) Remarks (1 results)

  • [Journal Article] 要素モデルの統合が実現する壁からプラズマまでを含めた中性粒子輸送研究2022

    • Author(s)
      齋藤誠紀,中村浩章,澤田圭司,河村学思,小林政弘
    • Journal Title

      J. Plasma Fusion Res.

      Volume: 98, 1 Pages: 5-19

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Isotope effect of rovibrational distribution of hydrogen molecules desorbed from amorphous carbon2022

    • Author(s)
      H. Nakamura, S. Saito, T. Sawada, K. Sawada, G. Kawamura, M. Kobayashi, and M. Hasuo
    • Journal Title

      Journal of Applied Physics

      Volume: 61 Issue: SA Pages: SA1005-SA1005

    • DOI

      10.35848/1347-4065/ac2435

    • NAID

      120007191897

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular dynamics simulation for hydrogen recycling on tungsten divertor for neutral transport analysis2020

    • Author(s)
      Saito Seiki、Nakamura Hiroaki、Sawada Keiji、Kobayashi Masahiro、Kawamura Gakushi、Sawada Takumi、Masahiro Hasuo
    • Journal Title

      Japanese Journal of Applied Physics

      Volume: 60 Issue: SA Pages: SAAB08-SAAB08

    • DOI

      10.35848/1347-4065/abc105

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Molecular Dynamics Simulation Model of Hydrogen Recycling on Carbon Divertor for Neutral Transport Analysis in LHD2020

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, G. Kawamura, M. Kobayashi, M. Hasuo
    • Journal Title

      Contrib. Plasm. Phys.

      Volume: - Issue: 5-6

    • DOI

      10.1002/ctpp.201900152

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Neutral transport code for rovibrational population calculation of molecular hydrogen in large helical device plasmas2020

    • Author(s)
      Keiji Sawada, Hiroaki Nakamura, Seiki Saito, Gakushi Kawamura, Masahiro Kobayashi, Kenta Haga, Ryusei Migita, Takumi Sawada, Masahiro Hasuo
    • Journal Title

      Contrib. Plasm. Phys.

      Volume: - Issue: 5-6

    • DOI

      10.1002/ctpp.201900153

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Neutron Irradiation Effects on Bubble Formed Tungsten Material2019

    • Author(s)
      S. Saito, H. Nakamura, K. Suzuki
    • Journal Title

      Proceedings of ISPlasma 2019

      Volume: -

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Development of Simulation Model of Hydrogen Recycling on Carbon Divertor by Molecular Dynamics Simulation2018

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo
    • Journal Title

      Proceedings of ICMSquare 2018

      Volume: -

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Electromagnetic field analysis of the microwave jet plasma generator using the FDTD method2018

    • Author(s)
      I. Kawata, H. Nakamura, Y. Fujita, S. Saito
    • Journal Title

      Proceedings of JSST 2018

      Volume: - Pages: 42-45

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] The Effect of Helium Plasma Irradiation to Tungsten Materials with Helium Bubbles2018

    • Author(s)
      S. Fueki, H. Nakamura, S. Saito
    • Journal Title

      Proceedings of JSST 2018

      Volume: - Pages: 46-49

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Neutron irradiation simulation on tungsten materials by PHITS code2018

    • Author(s)
      K. Suzuki, H. Nakamura, S. Saito
    • Journal Title

      Proceedings of JSST 2018

      Volume: - Pages: 39-41

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Molecular Dynamics Simulation of Ion Implantation with Heat Transfer into Bulk2018

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo
    • Journal Title

      Proceedings of JSST 2018

      Volume: - Pages: 80-83

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Analysis of Hydrogen Recycling Process on Carbon Material by Molecular Dynamics Simulation and Attempt at development of Its Deep Learning Model2022

    • Author(s)
      S. Saito, H. Nakamura, K. Takasan, M. Iida, K. Sawada, M. Kobayashi, M. Hasuo, and T. Ido
    • Organizer
      The International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Simulation for Hydrogen Recycling on Plasma Facing Materials2021

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo, and T. Ido
    • Organizer
      The 30th International Toki Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Development of Molecular Dynamics Simulation Code for Hydrogen Recycling on Plasma Facing Materials for Neutral Transport Analysis in Fusion Device2021

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo, and T. Ido
    • Organizer
      Plasma Edge Theory Workshop
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Investigation of hydrogen recycling process on tungsten divertor2021

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo, and T. Ido
    • Organizer
      The 40th JSST Annual International Conference on Simulation Technology
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Simulation on Hydrogen Recycling on Plasma Facing Materials2021

    • Author(s)
      Seiki Saito, Hiroaki Nakamura, Keiji Sawada, Masahiro Kobayashi, Gakushi Kawamura, Masahiro Hasuo
    • Organizer
      ISPlamsa2021
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Numerical Simulation for Dynamics of Hydrogen Moleculesfrom Inside of Divertor Material to SOL Plasmas2020

    • Author(s)
      Seiki Saito, Hiroaki Nakamura, Keiji Sawada, Masahiro Kobayashi, Gakushi Kawamura, Masahiro Hasuo
    • Organizer
      AAPPS-DPP2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Incident angle dependence of the atomic and molecular emission on hydrogen recycling on plasma facing materials2020

    • Author(s)
      Seiki Saito, Hiroaki Nakamura, Keiji Sawada, Masahiro Kobayashi, Gakushi Kawamura, Masahiro Hasuo
    • Organizer
      PSI2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Simulation Model of Hydrogen Recycling on Tungsten Divertor for Neutral Transport Analysis in Fusion Device2020

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, and M. Hasuo
    • Organizer
      12th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Simulation for Hydrogen Recycling on Carbon Divertor2019

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, and M. Hasuo
    • Organizer
      4th International Workshop on Models and Data for Plasma-Material Interaction in Fusion Devices
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Neutron Irradiation Effects on Bubble Formed Tungsten Material2019

    • Author(s)
      S. Saito, H. Nakamura, K. Suzuki
    • Organizer
      ISPlasma 2019
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Development of Simulation Model of Hydrogen Recycling on Carbon Divertor by Molecular Dynamics Simulation2018

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo
    • Organizer
      ICMSquare 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electromagnetic field analysis of the microwave jet plasma generator using the FDTD method2018

    • Author(s)
      I. Kawata, H. Nakamura, Y. Fujita, S. Saito
    • Organizer
      JSST 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] The Effect of Helium Plasma Irradiation to Tungsten Materials with Helium Bubbles2018

    • Author(s)
      S. Fueki, H. Nakamura, S. Saito
    • Organizer
      JSST 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Neutron irradiation simulation on tungsten materials by PHITS code2018

    • Author(s)
      K. Suzuki, H. Nakamura, S. Saito
    • Organizer
      JSST 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Molecular Dynamics Simulation of Ion Implantation with Heat Transfer into Bulk2018

    • Author(s)
      S. Saito, H. Nakamura, K. Sawada, M. Kobayashi, G. Kawamura, M. Hasuo
    • Organizer
      JSST 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 炭素壁水素リサイクリングの分子動力学計算2018

    • Author(s)
      齋藤誠紀,中村浩章,澤田圭司,小林政弘,河村学思,蓮尾昌裕
    • Organizer
      プラズマシミュレータシンポジウム 2018
    • Related Report
      2018 Research-status Report
  • [Presentation] プラズマ対向壁リサイクリングモデル開発を目指した水素プラズマ照射の分子動力学シミュレーション2018

    • Author(s)
      齋藤誠紀,中村浩章,澤田圭司,小林政弘,河村学思,蓮尾昌裕
    • Organizer
      日本応用数理学会 2018年度年会
    • Related Report
      2018 Research-status Report
  • [Presentation] 分子動力学法による炭素壁水素リサイクリングモデルの開発2018

    • Author(s)
      齋藤誠紀,中村浩章,澤田圭司,小林政弘,河村学思,蓮尾昌裕
    • Organizer
      第12回核融合エネルギー連合講演会
    • Related Report
      2018 Research-status Report
  • [Remarks] 核融合大型計算機利用研究優秀賞(令和元年度)

    • URL

      https://www.qst.go.jp/site/rokkasyo/44094.html

    • Related Report
      2020 Research-status Report

URL: 

Published: 2018-04-23   Modified: 2023-01-30  

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