Function of self-healing of magnetic configuration in helical fusion reactor

• Project/Area Number: 15K06649
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: NARUSHIMA Yoshiro 核融合科学研究所, ヘリカル研究部, 助教 (40332184)
• Project Period (FY): 2015-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 磁場閉じ込めプラズマ / 平衡磁場 / 磁気島 / ヘリカルプラズマ / 平衡磁場配位 / デタッチ / 核融合プラズマ / 磁場閉じ込め核融合 / プラズマ平衡 / デタッチプラズマ / ヘリオトロン / 核融合 / プラズマ

Outline of Final Research Achievements

In the LHD, it is important that the ability of the self-healing of the magnetic field configuration works properly in any plasma. As a result of comparing the deuterium plasma with the hydrogen plasma, it was found that the hydrogen plasma was easier to be self-healing than the deuterium plasma. It was difficult to realize the self-healing in the deuterium plasma, but it was confirmed that the ability of the self-healing by the plasma flow works, and that the equilibrium magnetic field configuration can be self healed if the conditions are satisfied.

Academic Significance and Societal Importance of the Research Achievements

本研究により、重水素プラズマにおいても平衡磁場配位の自己修復機能が働くことが確認された。これは、磁場配位構造の破壊によるプラズマ閉じ込め性能の深刻な低下を避けることが可能であることを意味する。さらに、スピンオフ的に発見された非接触プラズマと平衡磁場配位との相関については、非接触プラズマ実現のためのひとつの方策を提供した。これらのことは、将来のヘリオトロン型核融合炉実現に向けて意義のある結果である。

Research Products

• [Int'l Joint Research] CIEMAT(スペイン)
• [Int'l Joint Research] エネルギー環境技術研究センター(CIEMAT)(スペイン)
• [Int'l Joint Research] RFX研究所(イタリア)
• [Int'l Joint Research] ウィスコンシン大学(米国)
• [Int'l Joint Research] エネルギー環境技術研究センター(CIEMAT)(スペイン)
• [Int'l Joint Research] RFX研究所(イタリア)
• [Int'l Joint Research] ウィスコンシン大学(米国)
• [Journal Article] Observations of sustained phase shifted magnetic islands from externally imposedm/n??=??1/1 RMP in LHD (2017)
  • Author(s): Narushima Y.、Sakakibara S.、Suzuki Y.、Watanabe K.Y.、Ohdachi S.、Takemura Y.、Yoshinuma M.、Ida K.、Castejon F.、Lopez-Bruna D.、Hegna C.C.、Kobayashi M.、Tanaka H.、Akiyama T.、Ohno N.、The LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 7 Pages: 076024-076024
  • DOI: 10.1088/1741-4326/aa6dce
  • Peer Reviewed
• [Journal Article] Distorted magnetic island formation during slowing down to mode locking in helical plasmas (2017)
  • Author(s): T. Tokuzawa, Y. Takemura, K.Y. Watanabe, S. Sakakibara, Y. Narushima, H. Tsuchiya, Y. Nagayama, S. Inagaki, K. Ida, M. Yoshinuma, K. Tanaka, Y. Suzuki, I. Yamada, and the LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: ５７ Issue: 7 Pages: 076003-076003
  • DOI: 10.1088/1741-4326/aa6d26
  • NAID: 120007029203
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Observation of the ballooning mode that limits the operation space of the high-density super-dense-core plasma in the LHD (2017)
  • Author(s): Ohdachi S.、Watanabe K.Y.、Tanaka K.、Suzuki Y.、Takemura Y.、Sakakibara S.、Du X.D.、Bando T.、Narushima Y.、Sakamoto R.、Miyazawa J.、Motojima G.、Morisaki T.、LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 6 Pages: 066042-066042
  • DOI: 10.1088/1741-4326/aa6c1e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Experimental observation of response to resonant magnetic perturbation and its hysteresis in LHD (2015)
  • Author(s): Y. Narushima, S. Sakakibara, S. Ohdachi, Y. Suzuki, K.Y. Watanabe, S. Nishimura, S. Satake, B. Huang, M. Furukawa, Y. Takemura, K. Ida, M. Yoshinuma, I. Yamada and The LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 55 Issue: 7 Pages: 073004-073004
  • DOI: 10.1088/0029-5515/55/7/073004
  • NAID: 120007046129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] LHDの磁気島がヒーリングする領域に与える重水素プラズマの影響 (2019)
  • Author(s): 成嶋吉朗
  • Organizer: プラズマ・核融合学会 第36回年会
• [Presentation] Magnetic field structure and plasma response field in LHD detached plasmas (2018)
  • Author(s): Y. NARUSHIMA, M. KOBAYASHI, S. SAKAKIBARA, K. WATANABE, Y. TAKEMURA, S. OHDACHI, Y. SUZUKI and LHD-Exp. Gr.
  • Organizer: 第11回 核融合エネルギー連合講演会
• [Presentation] Behavior of the resonant magnetic perturbation in LHD detached plasmas (2018)
  • Author(s): Y. Narushima
  • Organizer: Joint Meeting of US-Japan MHD Workshop and 31st ITPA MHD Disruption and Control Topical Group
  • Int'l Joint Research
• [Presentation] Behavior of the resonant magnetic perturbation in LHD detached plasmas (2018)
  • Author(s): Y. Narushima
  • Organizer: 2018 US-Japan MHD Workshop
  • Int'l Joint Research
• [Presentation] Behavior of intermediate state of magnetic islands and utilization of resonant magnetic perturbation for detached plasma in LHD (2017)
  • Author(s): Y. Narushima
  • Organizer: 22nd Workshop on MHD Stability Control
  • Int'l Joint Research / Invited
• [Presentation] Transition to detached plasma established by amplified resonant magnetic perturbation in LHD (2017)
  • Author(s): Y. Narushima
  • Organizer: 44th EPS Conference on Plasma Physics
  • Int'l Joint Research
• [Presentation] Study of plasma response of magnetic island produced by resonant magnetic perturbation in LHD deuterium plasmas (2017)
  • Author(s): Y. Narushima
  • Organizer: 21st International Stellarator-Heliotron Workshop
  • Int'l Joint Research
• [Presentation] Experimental observation of the ECCD on m/n = 2/1 magnetic island in LHD (2017)
  • Author(s): 成嶋吉朗
  • Organizer: Plasma Conference 2017
• [Presentation] LHDのデタッチプラズマ形成時に観測される種々の共鳴摂動磁場構造 (2016)
  • Author(s): 成嶋吉朗、小林政弘、田中宏彦、榊原悟、大舘聡、 鈴木康浩、渡邊清政、武村勇輝、大野哲靖、LHD実験グループ
  • Organizer: プラズマ・核融合学会 第33回年会
  • Place of Presentation: 宮城県仙台市
  • Year and Date: 2016-11-29
• [Presentation] Observations of sustained phase shifted magnetic islands from externally imposed m/n = 1/1 RMP in LHD (2016)
  • Author(s): Y. Narushima, S. Sakakibara, Y. Suzuki, K. Y. Watanabe, S. Ohdachi, Y. Takemura, M. Yoshinuma, K. Ida, F. Castejon, D. Lopez-Bruna, C. C. Hegna, M. Kobayashi, H. Tanaka, T. Akiyama, N. Ohno, and the LHD Experiment Group
  • Organizer: 26th IAEA FEC
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] LHDのデタッチ放電におけるプラズマ応答磁場構造 (2016)
  • Author(s): 成嶋吉朗, 小林政弘, 田中宏彦, 榊原悟, 鈴木康弘, 渡邊清政,大舘暁, 武村勇輝, 秋山毅志, 大野哲靖, LHD実験グループ
  • Organizer: 第11回 核融合エネルギー連合講演会
  • Place of Presentation: 福岡県福岡市西区
  • Year and Date: 2016-07-14
• [Presentation] Structure of resonant magnetic perturbation in LHD detached plasma (2016)
  • Author(s): Y. Narushima, M. Kobayashi, H. Tanaka, S. Sakakibara, Y. Suzuki, K. Y. Watanabe, S. Ohdachi, Y. Takemura, T. Akiyama, N. Ohno, F. Castejon, D. Lopez-Bruna and the LHD Experiment Group
  • Organizer: 43rd European Physical Society Conference on Plasma Physics
  • Place of Presentation: Leuven, Belgium
  • Year and Date: 2016-07-04
  • Int'l Joint Research
• [Presentation] LHDプラズマ中の磁気島遷移時の磁気島構造 (2015)
  • Author(s): Y. Narushima, S. Sakakibara, Y. Suzuki, K. Y. Watanabe, S. Ohdachi, Y. Takemura, M. Kobayashi, H. Tanaka, T. Akiyama, N. Ohno, and the LHD Experiment Group
  • Organizer: プラズマ・核融合学会 第32回年会
  • Place of Presentation: 愛知県 名古屋大学
  • Year and Date: 2015-11-24
• [Presentation] Spontaneous healing of magnetic islands in the LHD by plasma flow (2015)
  • Author(s): Y. Narushima, C. C. Hegna, S. Sakakibara, F. Castejón, K. Y. Watanabe, D. López-Bruna, S. Ohdachi, Y. Suzuki, S. Nishimura, M. Furukawa, Y. Takemura, K. Ida, M. Yoshinuma, I. Yamada, M. Yokoyama, S. Satake, B. Huang, and the LHD Experiment Group
  • Organizer: 20th International Stellarator-Heliotron Workshop
  • Place of Presentation: ドイツ グライフスバルト
  • Year and Date: 2015-10-05
  • Int'l Joint Research