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Understanding and control of plasma detachment caused by composite gas seeding

Research Project

Project/Area Number 19K03790
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 14020:Nuclear fusion-related
Research InstitutionUniversity of Tsukuba

Principal Investigator

Ezumi Naomichi  筑波大学, 数理物質系, 准教授 (20321432)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords非接触プラズマ / ダイバータ / プラズマ-ガス相互作用 / 原子分子過程 / 分子活性化再結合 / 窒素 / 水素 / ターゲット形状 / プラズマ / 核融合
Outline of Research at the Start

磁場閉じ込め核融合炉の実現において、プラズマとガスとの相互作用により形成される非接触プラズマの挙動の理解とその制御方法の確立は、ダイバータ板への熱粒子負荷低減、炉心プラズマとの整合性の点において重要な課題である。本研究では非接触プラズマ形成における水素ガスと不純物ガスの重畳効果に注目し、複合ガス入射による非接触プラズマ生成とその空間構造の理解を進める。本研究の遂行により、ITER/原型炉の非接触プラズマ制御に適用できる物理モデルの構築に寄与するとともに、ここで得られる知見から、気相反応の物理化学過程や、種々の化合物合成や機能性薄膜生成など、産業応用分野への展開も期待できる。

Outline of Final Research Achievements

Remarkable progress has been made on the understanding the role of N2 and H2 seeding on plasma detachment in divertor simulation experiments using the end-loss region of the tandem mirror device GAMMA 10/PDX. These issues have been experimentally investigated for different gas species, seeding rate and target angles. We have newly observed Nitrgoen Molecular Assisted/Activated Recombination (N-MAR) processes during combination seeding of N2 and H2 which led to a clear decrease of ion flux to the divertor target. Simultaneously, spectrum emission from the NH radical has been observed. The results indicate the importance of molecular gas behavior for not only heat load control in fusion device, but also application for such as nitride processing, ammonia production and so on. Furthermore, V-shaped target experiment in different target angles shows an area of Hydrogen-MAR move to upstream in the case of small angle slot.

Academic Significance and Societal Importance of the Research Achievements

本研究の主な成果であるプラズマ中での窒素-水素の反応過程の理解は、核融合炉実現において重要な課題のひとつである定常的な高熱流束プラズマに晒されるダイバータ板への熱負荷低減に不可欠な非接触プラズマ制御の高度化に寄与するものである。また、その反応過程の理解は窒素、水素を利用する産業応用分野においても重要な知見となると考えられる。

Report

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

    (28 results)

All 2022 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 3 results) Remarks (3 results)

  • [Int'l Joint Research] General Atomics/UCSD(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] General Atomics/UC San Diego(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of California, San Diego/General Atomics(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Influence of Nitrogen Ratio on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX2021

    • Author(s)
      GAMO Hiroki、EZUMI Naomichi、SUGIYAMA Tsukasa、NOJIRI Kunpei、KONDO Ayane、HIRATA Mafumi、KOHAGURA Junko、YOSHIKAWA Masayuki、NAKASHIMA Yousuke、HWANGBO Dogyun、SAKAMOTO Mizuki、PERILLO Renato、KUWABARA Tatsuya、TANAKA Hirohiko、OHNO Noriyasu、SAWADA Keiji、TONEGAWA Akira、MASUZAKI Suguru
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Issue: 0 Pages: 2402041-2402041

    • DOI

      10.1585/pfr.16.2402041

    • NAID

      130008028416

    • ISSN
      1880-6821
    • Year and Date
      2021-03-19
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sensitivity improvement of infrared imaging video bolometer for divertor plasma measurement2021

    • Author(s)
      Mukai K.、Peterson B. J.、Ezumi N.、Shigematsu N.、Ohshima S.、Miyashita A.、Matoike R.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 6 Pages: 063521-063521

    • DOI

      10.1063/5.0043664

    • NAID

      120007166309

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synergistic effect of nitrogen and hydrogen seeding gases on plasma detachment in the GAMMA 10/PDX tandem mirror2019

    • Author(s)
      Ezumi Naomichi、Iijima Takaaki、Sakamoto Mizuki、et al.
    • Journal Title

      Nuclear Fusion

      Volume: - Issue: 6 Pages: 066030-066030

    • DOI

      10.1088/1741-4326/ab1a4a

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Observation of nitrogen assisted/associated recombination in divertor relevant hydrogen plasma of GAMMA 10/PDX2022

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, N. Shigematsu, T. Seto, T. Okamoto, K. Takanashi, S. Takahashi, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, S. Masuzaki
    • Organizer
      ISPlasma2022 / IC-PLANTS2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Plasma Detachment in GAMMA 10/PDX Tandem Mirror: Role of Molecule Gases and Target Configuration2021

    • Author(s)
      N. EZUMI, T. SUGIYAMA, H. GAMO, Y. TAKAMI, T. IIJIMA, K. NOJIRI, T. HARA, Y. ANDO, A. KONDO, M. HIRATA, J. KOHAGURA, M. YOSHIKAWA, Y. NAKASHIMA, M. SAKAMOTO, R. PERILLO, H.Y. GUO, T. KUWABARA, H. TANAKA, N. OHNO, K. SAWADA, A. TONEGAWA, S. MASUZAKI
    • Organizer
      28th IAEA Fusion Energy Conference (FEC 2020)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Influence of Nitrogen and Neon on Plasma Detachment during Combined Seeding with Hydrogen on Divertor Simulation Experiment of GAMMA 10/PDX2021

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, N. Ohno, K. Sawada, S. Kado, S. Masuzaki
    • Organizer
      30th ITPA-DivSOL meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Divertor simulation experiment in the open magnetic field of GAMMA 10/PDX: effect of nitrogen seeding on plasma detachment2021

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, A. Kondo, S. Togo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, N. Ohno, K. Sawada, S. Masuzaki
    • Organizer
      International Mini-Workshop on Open Magnetic Systems for Plasma Confinement (OS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GAMMA 10/PDXにおけるV字ターゲット角度によるダイバータ模擬プラズマへの影響2021

    • Author(s)
      杉山吏作,江角直道,蒲生宙樹,近藤綾音,重松直希,瀬戸拓実,平田真史,小波蔵純子,吉川正志,中嶋洋輔,皇甫度均,東郷訓,坂本瑞樹,桑原 弥,田中宏彦,大野哲靖,澤田圭司,利根川昭,増﨑貴,河村学思
    • Organizer
      第38回プラズマ・核融合学会 年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] GAMMA 10/PDXダイバータ模擬実験における水素ガスと窒素及びネオンガスとの重畳入射が非接触プラズマ形成へ及ぼす影響2021

    • Author(s)
      蒲生宙樹,江角 直道,杉山吏作, 近藤綾音, 重松直希, 瀬戸拓実, 東郷訓, 平田真史, 小波蔵純子, 吉川正志, 皇甫度均, 中嶋洋輔, 坂本瑞樹, R. Perillo, 桑原竜弥, 田中宏彦, 大野哲靖, 澤田圭司, 利根川昭, 増崎貴
    • Organizer
      第38回プラズマ・核融合学会 年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] GAMMA 10/PDXにおけるイメージングボロメータ計測の高感度化2021

    • Author(s)
      重松直希,向井清史,江角直道,坂本瑞樹,東郷訓,平田真史,蒲生宙樹,杉山吏作,近藤綾音,瀬戸拓実
    • Organizer
      第38回プラズマ・核融合学会 年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] プラズマ-ガス複合系の物理 ~ 再結合過程を中心に ~2021

    • Author(s)
      江角直道
    • Organizer
      第25回プラズマ・核融合学会 九州・沖縄・山口支部大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Role of Molecular Processes and Target Configuration on Plasma Detachment in GAMMA 10/PDX2021

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, K. Nojiri, A. Kondo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, H.Y. Guo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa, S. Masuzaki
    • Organizer
      24th International Conference on Plasma Surface Interaction in Fusion Devices (PSI-24)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recent research progress on plasma detachment in divertor simulation experiment in GAMMA 10/PDX: Role of molecular processes and target configuration2020

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, K. Nojiri, A. Kondo, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, M. Sakamoto, R. Perillo, H.Y. Guo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa, S. Masuzaki
    • Organizer
      4th Asia Pacific Conference on Plasma Physics (AAPPS-DPP2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Effects of V-shaped target angle on plasma behavior in the GAMMA 10/PDX divertor simulation experimental module2020

    • Author(s)
      Tsukasa SUGIYAMA, Naomichi EZUMI, Hiroki GAMO1, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Masayuki YOSHIKAWA, Dogyun HWANGBO, Houyang GUO, Junko KOHAGURA, Yousuke NAKASHIMA, Mizuki SAKAMOTO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, Suguru MASUZAKI, Gakushi KAWAMURA
    • Organizer
      The 29th International Toki Conference on Plasma and Fusion Research (ITC29)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Influence of nitrogen ratio during combined seeding with hydrogen on plasma detachment in the divertor simulation experimental module of GAMMA 10/PDX2020

    • Author(s)
      Hiroki GAMO, Naomichi EZUMI, Tsukasa SUGIYAMA, Kunpei NOJIRI, Ayane KONDO, Mafumi HIRATA, Junko KOHAGURA, Masayuki YOSHIKAWA, Yousuke NAKASHIMA, Dogyun HWANGBO, Mizuki SAKAMOTO, Renato PERILLO, Tatsuya KUWABARA, Hirohiko TANAKA, Noriyasu OHNO, Keiji SAWADA, Akira TONEGAWA, Suguru MASUZAKI
    • Organizer
      The 29th International Toki Conference on Plasma and Fusion Research (ITC29)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] GAMMA 10/PDXダイバータ模擬プラズマのV字ターゲット角度及び追加ガス入射位置による変化2020

    • Author(s)
      杉山吏作,江角直道,蒲生宙樹,野尻訓平,近藤綾音,平田真史,小波蔵純子,吉川正志,中嶋洋輔,皇甫度均,坂本瑞樹,H.Y. Guo,桑原竜弥,田中宏彦,大野哲靖,澤田圭司,利根川昭,増崎 貴,河村学思
    • Organizer
      第37回プラズマ・核融合学会 年会
    • Related Report
      2020 Research-status Report
  • [Presentation] GAMMA 10/PDXダイバータ模擬実験における非接触プラズマ形成への水素-窒素混合比の影響2020

    • Author(s)
      蒲生宙樹,江角直道,杉山吏作,野尻訓平,近藤綾音,平田真史,小波蔵純子,吉川正志,中嶋洋輔,皇甫度均,坂本瑞樹,R.Perillo,桑原竜弥,田中宏彦,大野哲靖,澤田圭司,利根川 昭,増崎 貴
    • Organizer
      第37回プラズマ・核融合学会 年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Plasma detachment caused by composite gas seeding in front of variable angle V-shaped target of GAMMA 10/PDX2019

    • Author(s)
      N. Ezumi, H. Gamo, T. Sugiyama, Y. Takami, T. Iijima, K. Nojiri, A. Terakado, T. Hara, Y. Ando, M. Sakamoto, M. Hirata, J. Kohagura, M. Yoshikawa, Y. Nakashima, R. Perillo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, A. Tonegawa and S. Masuzaki
    • Organizer
      7th International Workshop on Plasma Material Interaction Facilities for Fusion (PMIF 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Plasma detachment in divertor simulation experimental module of GAMMA 10/PDX: role of molecule gases2019

    • Author(s)
      N. Ezumi, R. Perillo, T. Iijima, K. Nojiri, A. Terakado, M. Sakamoto, Y. Nakashima, M. Hirata, J. Kohagura, M. Yoshikawa, T. Hara, Y. Ando, H. Gamo, T. Sugiyama, Y. Takami, K. Honma, A. Kondo, T. Kuwabara, H. Tanaka, N. Ohno, K. Sawada, S. Kado, A. Tonegawa and S. Masuzaki
    • Organizer
      The 28th International Toki Conference on Plasma and Fusion Research (ITC28)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] GAMMA 10/PDX における窒素-水素複合入射による非接触プラズマ形成への V字ターゲット角度の影響2019

    • Author(s)
      江角直道, 飯島貴朗, 野尻訓平, 寺門明紘, 原利樹, 安藤泰斗, 杉山吏作, 蒲生宙樹, 髙見耀平, 本間佳史, 近藤綾音, 坂本瑞樹, 平田真史, 小波蔵純子, 吉川正志, 中嶋洋輔, R. Perillo, 桑原竜弥, 田中宏彦, 大野哲靖, 澤田圭司, 利根川昭, 増崎貴
    • Organizer
      第36回プラズマ・核融合学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] GAMMA10/PDX ダイバータ模擬プラズマにおける放射損失パワー空間分布計測のためのイメージングボロメータシステムの開発2019

    • Author(s)
      安藤泰斗,江角直道,原 利樹,野尻訓平,坂本瑞樹,飯島貴朗,小波蔵純子,中嶋洋輔,吉川正志,寺門明紘,向井清史
    • Organizer
      第36回プラズマ・核融合学会年会
    • Related Report
      2019 Research-status Report
  • [Presentation] GAMMA 10/PDXダイバータ模擬プラズマ上流・下流のプローブ計測による非接触プラズマ形成過程のエネルギー損失評価2019

    • Author(s)
      原 利樹,飯島貴朗,江角直道,野尻訓平,寺門明紘,杉山吏作, 蒲生宙樹,本間佳史,M.S. Islam,平田真史,坂本瑞樹,中嶋洋輔
    • Organizer
      第36回プラズマ・核融合学会年会
    • Related Report
      2019 Research-status Report
  • [Remarks] 筑波大学プラズマ研究センターHP

    • URL

      https://www.prc.tsukuba.ac.jp

    • Related Report
      2021 Annual Research Report
  • [Remarks] 筑波大学プラズマ研究センター

    • URL

      https://www.prc.tsukuba.ac.jp

    • Related Report
      2020 Research-status Report
  • [Remarks] 筑波大学 プラズマ研究センター

    • URL

      http://www.prc.tsukuba.ac.jp

    • Related Report
      2019 Research-status Report

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

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