Elucidation of fine structure formation process during magnetic reconnection using ultra-high resolution ion Doppler tomography

• Project/Area Number: 17H04863
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Plasma science
• Research Institution: The University of Tokyo
• Principal Investigator: Tanabe Hiroshi 東京大学, 大学院新領域創成科学研究科, 助教 (30726013)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥18,720,000 (Direct Cost: ¥14,400,000、Indirect Cost: ¥4,320,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2017: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
• Keywords: プラズマ・核融合 / 磁気リコネクション / プラズマ診 / コンピュータトモグラフィ / イオン加熱 / プラズマ診断

Outline of Final Research Achievements

This research project experimentally proceeds the investigation of fine structure formation through magnetic reconnection, which is known as the fundamental process of the explosive energy conversion phenomena such as in solar flare, under the influence of guiding field which is perpendicular to reconnection plane. In the merging spherical tokamak formation experiments which utilize reconnection heating, the fine structure was formed when reconnection electric field increases its maximum and it was observed that the structure is impulsively ejected toward downstream when the resistivity reaches the anomalous regime, and it was found that the microscopic localized heating structure around the X-point is finally converted to a global one which surrounds the whole flux surfaces of the two merging plasmas.

Academic Significance and Societal Importance of the Research Achievements

リコネクション加熱を核融合分野に応用した、世界最大の球状トカマク実験MASTをはじめとした高ガイド磁場実験で観測され、核融合・宇宙・実験室の分野の枠を超えて近年注目されている、X点近傍に現れる微細構造形成メカニズムを明らかにすることに成功した。リコネクション電場の成長とともに、X点近傍に局在化した加熱構造が生成され、高速リコネクションの発現とともにX点近傍にブロブ構造が現れるとともに同構造排出先の合体下流で巨大加熱が得られ、同領域に接続された合体プラズマを覆うグローバルな磁気面上でイオンが加熱されることを解明。核融合プラズマ応用シナリオの開拓として、後者の最適化が重要であることを明らかにした。

Research Products

• [Int'l Joint Research] カラム研究所/トカマクエナジー(英国)
• [Int'l Joint Research] プリンストンプラズマ物理研究所(米国)
• [Int'l Joint Research] カラム研究所/トカマクエナジー(英国)
• [Int'l Joint Research] プリンストンプラズマ物理研究所(米国)
• [Journal Article] First Global Doppler Tomography Measurement of Ion Heating of Merging Tokamak Plasmas (2019)
  • Author(s): Tanaka Haruaki、Ono Yasushi、Tanabe Hiroshi、Cao Qinghong
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 139 Issue: 8 Pages: 358-359
  • DOI: 10.1541/ieejfms.139.358
  • NAID: 130007686683
  • ISSN: 0385-4205, 1347-5533
  • Year and Date: 2019-08-01
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Recent Progress in High Resolution 2D Imaging Measurements of Reconnection Heating during Merging Plasma Startup in TS-3 (2019)
  • Author(s): TANABE Hiroshi、CAO Qinghong、TANAKA Haruaki、AHMADI Tara、AKIMITSU Moe、SAWADA Asuka、INOMOTO Michiaki、ONO Yasushi
  • Journal Title: Plasma and Fusion Research Volume: 14 Issue: 0 Pages: 3401110-3401110
  • DOI: 10.1585/pfr.14.3401110
  • NAID: 130007695136
  • ISSN: 1880-6821
  • Year and Date: 2019-07-24
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Investigation of fine structure formation of guide field reconnection during merging plasma startup of spherical tokamak in TS-3U (2019)
  • Author(s): Tanabe H.、Cao Q.、Tanaka H.、Ahmadi T.、Akimitsu M.、Sawada A.、Inomoto M.、Ono Y.
  • Journal Title: Nuclear Fusion Volume: 59 Issue: 8 Pages: 086041-086041
  • DOI: 10.1088/1741-4326/ab1cdf
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reconnection heating experiments and simulations for torus plasma merging startup (2019)
  • Author(s): Ono Yasushi、Inoue Shizuo、Tanabe Hiroshi、Cheng Chio-Zong、Hara Hirohisa、Horiuchi Ritoku
  • Journal Title: Nuclear Fusion Volume: to be published Issue: 7 Pages: 076025-076025
  • DOI: 10.1088/1741-4326/ab14a4
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effects of reconnection downstream conditions on electron parallel acceleration during merging start-up of spherical tokamak (2019)
  • Author(s): Inomoto Michiaki、Ushiki Tomohiko、Guo Xuehan、Sugawara Takumichi、Kondo Kyohei、Mihara Takumi、Minami Yusuke、Inai Yuki、Kaneko Hiraku、Yanai Ryoma、Takahata Yoshifumi、Tanabe Hiroshi、Ono Yasushi、Sanpei A、Kamio Shuji
  • Journal Title: Nuclear Fusion Volume: to be published Issue: 8 Pages: 086040-086040
  • DOI: 10.1088/1741-4326/ab1e0f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Dependence of the pickup-like ion effective heating on the poloidal and toroidal magnetic fields during magnetic reconnection (2019)
  • Author(s): Usami Shunsuke、Horiuchi Ritoku、Ohtani Hiroaki、Ono Yasushi、Inomoto Michiaki、Tanabe Hiroshi
  • Journal Title: Physics of Plasmas Volume: 26 Issue: 10 Pages: 102103-102103
  • DOI: 10.1063/1.5099423
  • NAID: 120007149367
  • Peer Reviewed
• [Journal Article] Recent progress of high resolution 2D imaging measurement of reconnection heating during merging plasma startup in TS-3 (2019)
  • Author(s): Tanabe Hiroshi、Cao Qinghong、Tanaka Haruaki、Ahmadi Tara、Akimitsu Moe、Sawada Asuka、Inomoto Michiaki、Ono Yasushi
  • Journal Title: Plasma and Fusion Research Volume: to be published
  • NAID: 130007695136
  • Peer Reviewed / Open Access
• [Journal Article] High-Resolution 2D Magnetic Field Measurement of Magnetic Reconnection Using Printed-Circuit Board Coils (2018)
  • Author(s): AKIMITSU Moe、ONO Yasushi、CAO Qinghong、TANABE Hiroshi
  • Journal Title: Plasma and Fusion Research Volume: 13 Issue: 0 Pages: 1202108-1202108
  • DOI: 10.1585/pfr.13.1202108
  • ISSN: 1880-6821
  • Year and Date: 2018-09-25
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of High-resolution Two-dimensional Magnetic Field Measurement System by Use of Printed-circuit Technology (2018)
  • Author(s): Akimitsu Moe、Ono Yasushi、Cao Qinghong、Masuki Ryota、Tanabe Hiroshi
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 138 Issue: 9 Pages: 480-481
  • DOI: 10.1541/ieejfms.138.480
  • NAID: 130007479879
  • ISSN: 0385-4205, 1347-5533
  • Year and Date: 2018-09-01
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effective Proton Heating through Collisionless Driven Reconnection in the Presence of Guide Field (2018)
  • Author(s): Shunsuke Usami, Ritoku Horiuchi, Hiroaki Ohtani, Yasushi Ono, Hiroshi, Tanabe
  • Journal Title: Plasma and Fusion Research Volume: 13 Issue: 0 Pages: 3401025-3401025
  • DOI: 10.1585/pfr.13.3401025
  • NAID: 130006744398
  • ISSN: 1880-6821
  • Year and Date: 2018-04-10
  • Peer Reviewed / Open Access
• [Journal Article] Recent progress of magnetic reconnection research in the MAST spherical tokamak (Invited) (2017)
  • Author(s): H. Tanabe, T. Yamada , T. Watanabe , K. Gi , M. Inomoto , R. Imazawa , M. Gryaznevich , C. Michael , B. Crowley , N. J. Conway , R. Scannell , J. R. Harrison , I. Fitzgerald , A. Meakins , N. C. Hawkes , K. G. McClements , T, O Gorman , C,Z. (Frank) Cheng , Y. Ono , the MAST team
  • Journal Title: Physics of Plasmas Volume: 24 Issue: 5 Pages: 056108-056108
  • DOI: 10.1063/1.4977922
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Investigation of Merging/reconnection Heating during Solenoid-free Startup of Plasmas in the MAST Spherical Tokamak (2017)
  • Author(s): H. Tanabe, T. Yamada, K. Gi, T. Watanabe, M. Inomoto, R. Imazawa, M. Gryaznevich, R. Scannell, N. Conway, C. Michael, B. Crowley, I. Fitzgerald, A. Meakins, N. Hawkes, K. McClements, J. Harrison, T. O'Gorman, C. Z. Cheng, Y. Ono
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 5 Pages: 056037-056037
  • DOI: 10.1088/1741-4326/aa6608
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Separated Double-Current Layers in a High-Guide-Field Reconnection Experiment (2017)
  • Author(s): Kyohei Kondo, Michiaki Inomoto, Xuehan Guo, Tomohiko Ushiki, Takumichi Sugawara, Takumi Mihara, Shuji Kamio, Hiroshi Tanabe, Yasushi Ono
  • Journal Title: Plasma and Fusion Research Volume: 12 Issue: 0 Pages: 1202033-1202033
  • DOI: 10.1585/pfr.12.1202033
  • NAID: 130006081763
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Overview of recent physics results from MAST (2017)
  • Author(s): Kirk A.、Adamek J.、Akers R.J.、Allan S.、Inomoto M.、Imazawa R.、Ono Y.、Tanabe H.、the MAST Team and the EUROfusion MST1 Team
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 10 Pages: 102007-102007
  • DOI: 10.1088/1741-4326/aa65e0
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Full-2D imaging measurement of ion heating/transport process during high field merging experiment in TS-6 (2019)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, M. Akimitsu, M. Inomoto and Y. Ono
  • Organizer: 3rd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2019)
  • Int'l Joint Research / Invited
• [Presentation] 超解像イオンドップラートモグラフィを用いた高磁場合体・磁気リコネクションのイオン加熱・輸送過程の研究 (2019)
  • Author(s): 田辺博士，曹慶紅，田中遥暁，Tara Ahmadi，秋光萌，Thomas O'Gorman，Mikhail Gryaznevich，井通暁，小野靖
  • Organizer: 第36回プラズマ・核融合学会年会
• [Presentation] Micro/macro-scale ion heating and transport process of magnetic reconnection during merging plasma startup of TS-6 spherical tokamak (2019)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, M. Akimitsu, M. Gryaznevich,T. O'Gorman, J. Wood, R. Scannell, K. G. McClements, M. Inomoto and Y. Ono
  • Organizer: 61th Annual Meeting of the APS Division of Plasma Physics
  • Int'l Joint Research
• [Presentation] Investigation of ion heating/transport process of magnetic reconnection during CS-free merging plasma startup of spherical tokamak in TS-6 (2019)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, M. Akimitsu, T. Ahmadi, R. Someya, M. Inomoto, Y. Ono
  • Organizer: International Spherical Tokamak Workshop (ISTW) 2019
  • Int'l Joint Research
• [Presentation] 実験室リコネクションのドップラートモグラフィ計測 (2019)
  • Author(s): 田辺博士，曹慶紅，田中遥暁，Tara Ahmadi，秋光萌，Chio-zong Cheng，井通暁，小野靖
  • Organizer: 宇治リコネクションワークショップ2019
  • Invited
• [Presentation] Ion and electron heating characteristics of magnetic reconnection in high field flux tube merging experiments (2019)
  • Author(s): H. Tanabe, M. Gryaznevich, Q. Cao, H. Tanaka, T. Ahmadi, M. Akimitsu, C. Z. Cheng, M. Inomoto and Y. Ono
  • Organizer: HINODE13/IPELS2019
  • Int'l Joint Research / Invited
• [Presentation] Experimental study of reconnection heating/transport process and its application to high temperature spherical tokamak formation (2019)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, M. Akimitsu, M. Inomoto and Y. Ono
  • Organizer: 9th East-Asia School and Workshop on Laboratory, Space and Astrophysical Plasmas (EASW9)
  • Int'l Joint Research / Invited
• [Presentation] 趣旨説明＋リコネクション加熱実験～本郷新実験 TS-3U(TS-6)の動向その他～ (2019)
  • Author(s): 田辺博士, 曹慶紅, 秋光萌, 澤田明日香, 田中遥暁, Tara Ahmadi, 井通暁, 小野靖
  • Organizer: 第26回ひので・実験室研究会
  • Invited
• [Presentation] Fine structure formation by reconnection heating/transport process in toroidal plasma merging experiments (2019)
  • Author(s): H. Tanabe, Q. Cao, M. Akimitsu, A. Sawada, H. Tanaka, T. Ahmadi, M. Inomoto and Y. Ono
  • Organizer: MAX PLANCK PRINCETON CENTER WORKSHOP 2019 (MPCC2019)
  • Int'l Joint Research / Invited
• [Presentation] “新実験TS-3Ｕにおける超解像二次元画像診断を用いた合体・リコネクション加熱輸送過程の研究 (2018)
  • Author(s): 田辺博士, 田中遥暁, 曹慶紅, 秋光萌, 澤田明日香, Setthivoine You, 井通暁, 小野靖
  • Organizer: 第35回プラズマ・核融合学会
• [Presentation] “Investigation of ion heating/transport process during high guide field merging/ reconnection experiment (2018)
  • Author(s): H. Tanabe, H. Tanaka, Q. Cao, M. Akimitsu, A. Sawada, S. You, M. Inomoto and Y, Ono
  • Organizer: The 27th International Toki Conference on Plasma and Fusion Research & The 13th Asia Pacific Plasma Theory Conference
  • Int'l Joint Research / Invited
• [Presentation] Investigation of global ion heating/transport process during merging/ reconnection startup of spherical tokamak in TS-3U (2018)
  • Author(s): H. Tanabe, Q. Cao, M. Akimitsu, A. Sawada, H. Tanaka, S. Kamiya, S. You, M. Inomoto, C. Z. Cheng and Y. Ono
  • Organizer: 2nd Asia-Pacific Conference on Plasma Physics (AAPPS2018)
  • Int'l Joint Research
• [Presentation] Investigation of ion heating/transport process during high guide field reconnection using full-2D ultra high resolution ion Doppler tomography (2018)
  • Author(s): H. Tanabe, Q. Cao, M. Akimitsu, A. Sawada, H. Tanaka, S. Kamiya, S. You, M. Inomoto and Y. Ono
  • Organizer: 60th Annual Meeting of the APS Division of Plasma Physics
  • Int'l Joint Research
• [Presentation] Investigation of fine structure formation of guide field reconnection during merging plasma startup of spherical tokamak in TS-3U (2018)
  • Author(s): H. Tanabe, H. Hatano, T. Hayashi, Q. Cao, A. Sawada, M. Akimitsu, M. Inomoto and Y. Ono
  • Organizer: 27th IAEA Fusion Energy Conference
  • Int'l Joint Research
• [Presentation] Investigation of ion heating/transport process during high guide field reconnection using ultra-high resolution ion Doppler tomography in TS-3U (2018)
  • Author(s): H. Tanabe, H. Tanaka, Q. Cao, M. Akimitsu, A. Sawada, S. You, M. Inomoto and Y, Ono
  • Organizer: The US-Japan workshops and schools on magnetic reconnection (MR2018)
  • Int'l Joint Research / Invited
• [Presentation] ドップラープラズマ計測の新展開 (2018)
  • Author(s): 田辺博士
  • Organizer: APET特別講演会「ITER時代の核融合プラズマ研究の新展開」
  • Invited
• [Presentation] Investigation of ion heating/transport process during high guide field merging/reconnection experiment in TS-3U (2018)
  • Author(s): H. Tanabe, Q. Cao, S. Himeno, M. Akimitsu, A. Sawada, A. Borade, S. You, M. Inomoto, Y. Ono
  • Organizer: The 19th International Congress on Plasma Physics (ICPP2018)
  • Int'l Joint Research
• [Presentation] TS-3U 装置における超解像イオンドップラートモグラフィ計測を用いた合体リコネクション加熱輸送過程の研究 (2018)
  • Author(s): 田辺博士, 曹慶紅, 姫野俊一, 秋光萌, 澤田明日香, Anup Borade, Setthivoine You, 井通暁, 小野靖
  • Organizer: 第12回核融合エネルギー連合講演会
• [Presentation] トカマク合体を用いたリコネクション加熱分布計測 (2018)
  • Author(s): 田辺博士, 波多野博法, 林拓巳, 曹慶紅, 姫野俊一, 兼田泰志, 秋光萌, 澤田明日香, Anup Borade, 洪重奉, Setthivoine You, 井通暁, 小野靖
  • Organizer: 第25回ひので・実験室研究会
• [Presentation] TS-3U 装置における超解像イオンドップラートモグラフィ計測を用いた 合体リコネクション加熱輸送過程の研究 (2018)
  • Author(s): 田辺博士, 曹慶紅, 姫野俊一, 秋光萌, 澤田明日香, Anup Borade, Setthivoine You, 井通暁, 小野靖
  • Organizer: 第12回核融合エネルギー連合講演会
• [Presentation] Investigation of ion heating/transport process during high guide field reconnection using ultra-high resolution ion Doppler tomography in TS-3U (2018)
  • Author(s): H. Tanabe, H. Tanaka, Q. Cao, M. Akimitsu, A. Sawada, S. You, M. Inomoto and Y, Ono
  • Organizer: US-Japan Workshop on Magnetic Reconnection (MR2018)
  • Int'l Joint Research / Invited
• [Presentation] 新実験TS-3Uにおける超解像2次元画像診断を用いた合体・リコネクション加熱輸送過程の研究 (2018)
  • Author(s): 田辺博士, 田中遥暁, 曹慶紅, 秋光萌, 澤田明日香, Setthivoine You, 井通暁, 小野靖
  • Organizer: 第35回プラズマ・核融合学会年会
• [Presentation] Recent progress of magnetic reconnection research in high field merging experiment using 2D imaging diagnostics (2017)
  • Author(s): H. Tanabe, T. Yamada, T. Watanabe, K. Gi, M. Inomoto, R. Imazawa, M. Gryaznevich, R. Scannell, N. Conway, C. Michael, B. Crowley, T. O’Gorman, J. Harrison, I. Fitzgerald, A. Meakins, N. Hawkes, K. G. McClements, C. Z. Cheng, Y. Ono and the MAST team
  • Organizer: 1st Asia-Pacific Conference on Plasma Physics (AAPPS2017)
  • Int'l Joint Research / Invited
• [Presentation] Development of a sub-cm high resolution ion Doppler tomography diagnostics for fine structure measurement of guide field reconnection in TS-U (2017)
  • Author(s): H. Tanabe, H. Koike, H. Hatano, T. Hayashi, Q. Cao, S. Himeno, T. Kaneda, M. Akimitsu, A. Sawada and Y. Ono
  • Organizer: 59th Annual Meeting of the APS Division of Plasma Physics
  • Int'l Joint Research
• [Presentation] Development of a new 96 channel high resolution ion Doppler tomography dedicated for fine structure measurement of reconnection heating in TS-U (2017)
  • Author(s): H. Tanabe, H. Koike, H. Hatano, M. Inomoto, Y. Ono and the MAST team
  • Organizer: The 2017 International Workshop on the Interrelationship between Plasma Experiments in the Laboratory and in Space (IPELS 2017)
  • Int'l Joint Research
• [Presentation] 超解像イオンドップラートモグラフィを用いた磁気再結合のマクロ・ミクロスケール加熱構造形成過程の研究 (2017)
  • Author(s): 田辺博士, 波多野博法, 小池秀弥, 林拓巳, 曹慶紅, 兼田泰志, 秋光萌, 澤田明日香, 井通暁, 小野靖
  • Organizer: Plasma Conference 2017
• [Presentation] 実験室リコネクションのその場計測で見られる加速・加熱について (2017)
  • Author(s): H. Tanabe, T. Yamada, T. Watanabe, K. Gi, M. Inomoto, R. Imazawa, M. Gryaznevich, the MAST team, H. Koike, H. Hatano, C. Z. Cheng and Y. Ono
  • Organizer: 磁気リコネクション・粒子加速研究会
  • Invited
• [Remarks] 小野・井研究室
  • URL: http://tanuki.t.u-tokyo.ac.jp
• [Remarks] 第12回核融合エネルギー連合講演会 若手優秀発表賞受賞
  • URL: http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2018_08/jspf2018_08-439.pdf
• [Remarks] 第36回プラズマ・核融合学会年会 若手優秀発表賞(正会員部門)
  • URL: http://www.jspf.or.jp/jspf_annual2019/wakate2019.html
• [Remarks] 第12回核融合エネルギー連合講演会 若手優秀発表賞
  • URL: http://www.jspf.or.jp/Journal/PDF_JSPF/jspf2018_08/jspf2018_08-439.pdf