Development of plasma flow velocity field imaging using vector tomography technique

2021 Fiscal Year Annual Research Report

• Project/Area Number: 18K18747
• Research Institution: The University of Tokyo
• Principal Investigator: 田辺 博士 東京大学, 大学院新領域創成科学研究科, 准教授 (30726013)
• Project Period (FY): 2018-06-29 – 2022-03-31
• Keywords: プラズマ・核融合 / プラズマ診断 / 球状トカマク / コンピュータトモグラフィ / 加速・加熱・輸送

Outline of Annual Research Achievements

最終年度にあたる2021年度は、成果のとりまとめおよび論文・学会発表を中心に研究を遂行した。東京大学TS-6装置を用いたプラズマ合体・リコネクション実験でとらえた特徴的な構造形成現象を中心に研究成果の公表を開始、2021年に延期された核融合エネルギー国際会議IAEA-FEC2020(2021年5月実施)における論文発表をはじめ、アジア・太平洋物理学会連合プラズマ物理分科会(AAPPS-DPP2021)における招待講演、那珂核融合研究所との共同研究によるポロイダル視線のドップラー計測への応用成果等のプラズマ核融合学会での成果公表を実施した。
プラズマ合体・リコネクション実験で、X点近傍の加速・加熱・熱輸送を通じて従来シミュレーション等で予測された傾向と逆極性の構造が形成される新現象発見は、時期研究の種として基盤B(22H01193)採択の形で評価を受けたほか、実験発で発見された新現象としてNuclear Fusion誌に採択された。また大型装置応用としてJT-60Uの過去の放電データへの応用も推進され、ポロイダル計測視野のドップラープラズマ計測で得られたpassiveデータの活用により、今まで未活用であった計測用NBI不在で荷電交換分光計測が使えない状況でも、ドップラートモグラフィの応用によってkeV領域のプラズマでもNBIフリーで空間分布抽出可能性を見出し、大型装置応用の見込みを得て現在さらなる精度向上を試みている。トカマクエナジーST40共同実験へのドップラートモグラフィ応用や高磁場合体実験等の多角的な取り組みはアジア・太平洋物理学会連合プラズマ物理分科会(AAPPS-DPP2021)におけるU40若手研究者賞(2021 AAPPS-DPP Young Researcher Award (U40))として表彰を受け、論文・表彰・招待講演の形で最終年度の締めくくりとなった。

Research Products

• [Int'l Joint Research] プリンストンプラズマ物理研究所(PPPL)(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: プリンストンプラズマ物理研究所(PPPL)
• [Int'l Joint Research] トカマクエナジー/カラム研究所(英国)
  • Country Name: UNITED KINGDOM
  • Counterpart Institution: トカマクエナジー/カラム研究所
• [Journal Article] Two-dimensional resistive MHD simulation of the optimized plasma formation in the spherical tokamaks (2021)
  • Author(s): Ahmadi T.、Tanabe H.、Ono Y.
  • Journal Title: Nuclear Fusion Volume: 61 Pages: 066001～066001
  • DOI: 10.1088/1741-4326/abebce
  • Peer Reviewed
• [Journal Article] Double-filter high-resolution soft x-ray tomographic diagnostic for investigating electron acceleration in TS-6 reconnection merging experiments (2021)
  • Author(s): Xiang Junguang、Takeda Shinjiro、Cai Yunhan、Tanabe Hiroshi、Cao Qinghong、Tanaka Haruaki、Ono Yasushi
  • Journal Title: Review of Scientific Instruments Volume: 92 Pages: 083504～083504
  • DOI: 10.1063/5.0058112
  • Peer Reviewed
• [Journal Article] Plasma heating and current sheet structure in anti-parallel magnetic reconnection (2021)
  • Author(s): Cheng C. Z.、Inoue S.、Ono Y.、Tanabe H.、Horiuchi R.、Usami S.
  • Journal Title: Physics of Plasmas Volume: 28 Pages: 072101～072101
  • DOI: 10.1063/5.0039818
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Control of electron acceleration process during merging start-up of spherical tokamak (2021)
  • Author(s): Inomoto M.、Mihara T.、Kondo K.、Kaneko H.、Kusano K.、Kaneko K.、Maeda Y.、Shinohara A.、Jin H.、Suzuki T.、Tanabe H.、Ono Y.、Kamio S.、Kawamori E.
  • Journal Title: Nuclear Fusion Volume: 61 Pages: 116069～116069
  • DOI: 10.1088/1741-4326/ac2107
  • Peer Reviewed
• [Journal Article] Global ion heating/transport during merging spherical tokamak formation (2021)
  • Author(s): Tanabe H.、Tanaka H.、Cao Q.、Cai Y.、Akimitsu M.、Ahmadi T.、Cheng C.Z.、Inomoto M.、Ono Y.
  • Journal Title: Nuclear Fusion Volume: 61 Pages: 106027～106027
  • DOI: 10.1088/1741-4326/ac217c
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of Glass-Tube-Pair Type Doppler Probe Array for 1D Profile Measurement of Two Component Ion-Flow Vector (2021)
  • Author(s): SOMEYA Ryo、TANAKA Haruaki、FUNATO Yugo、CAI Yunhan、AKIMITSU Moe、TANABE Hiroshi、ONO Yasushi
  • Journal Title: Plasma and Fusion Research Volume: 16 Pages: 1202078～1202078
  • DOI: 10.1585/pfr.16.1202078
  • Peer Reviewed / Open Access
• [Journal Article] Global Ion Heating during ST Merging Driven by High Guide Field Reconnection (2021)
  • Author(s): TANAKA Haruaki、TANABE Hiroshi、CAO Qinghong、ONO Yasushi
  • Journal Title: Plasma and Fusion Research Volume: 16 Pages: 2402068～2402068
  • DOI: 10.1585/pfr.16.2402068
  • Peer Reviewed / Open Access
• [Journal Article] Development of Soft X-ray Stereo Imaging System for Time-evolution Measurement of High-energy Electron Distribution (2021)
  • Author(s): Takeda Shinjiro、Xiang Junguang、Cai Yunhan、Tanabe Hiroshi、Ono Yasushi
  • Journal Title: IEEJ Transactions on Fundamentals and Materials Volume: 141 Pages: 604～605
  • DOI: 10.1541/ieejfms.141.604
  • Peer Reviewed
• [Journal Article] Overview of Merging Spherical Tokamak Experiments and Simulations for Burning, High-Beta and/or Absolute Minimum-B Plasma Formation (2021)
  • Author(s): Y. Ono, M. Inomoto, H. Tanabe, H. Yamaguchi, M. Akimitsu, M. Gryaznevich, S. McNamara, P. Buxton, J. Kompulla, J.Wood, V. Nemytov, K. McClements, C.Z. Cheng, S. Usami and R. Horiuchi
  • Journal Title: Fusion Energy 2020 Volume: IAC/P4-3 Pages: 1-8
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Particle Simulation on Merging Processes of Two Spherical Tokamak-Type Plasmoids Confined in a Conducting Vessel (2021)
  • Author(s): S. Usami, R. Horiuchi, T. Moritaka, Y. Ono, M. Inomoto and H. Tanabe
  • Journal Title: Fusion Energy 2020 Volume: TH/P5-17 Pages: 1-8
  • Peer Reviewed
• [Journal Article] "Global ion heating/transport during merging spherical tokamak formation" (2021)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, A. Sawada, C.Z. Cheng and Y. Ono
  • Journal Title: Fusion Energy 2020 Volume: EX/P7-20 Pages: 1-8
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 英国核融合ベンチャートカマクエナジー社の企業活動事例紹介 (2021)
  • Author(s): 田辺博士
  • Organizer: 第17回YGN若手勉強会「核融合の早期実現という破壊的イノベーション」(日本原子力学会 若手連絡会)
  • Invited
• [Presentation] High field application of merging/reconnection plasma startup in the ST40 and TS-6 spherical tokamaks (2021)
  • Author(s): H. Tanabe, M. Gryaznevich, S. Mcnamara, J. Wood, H. Tanaka, M. Akimitsu, Y. Cai, D. Osin, P. Buxton, A. Rengle, O. Asunta, C. Z. Cheng, M. Inomoto and Y. Ono
  • Organizer: 5th Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2021)
  • Int'l Joint Research / Invited
• [Presentation] Application study of magnetic reconnection for high temperature spherical tokamak formation (2021)
  • Author(s): H. Tanabe, H. Tanaka, Y. Cai, M. Akimitsu, T. Ahmadi, R. Someya, M. Gryaznevich, S. McNamara, C. Z.Cheng, M. Inomoto and Y. Ono
  • Organizer: 63rd Annual Meeting of the APS Division of Plasma Physic (APS-DPP2021)
  • Int'l Joint Research
• [Presentation] NBIフリーイオン温度計測の高温プラズマシナリオ開発への応用展開 (2021)
  • Author(s): 田辺博士, 吉田麻衣子, 田中遥暁, 若月琢馬, Mikhail Gryaznevich, 井通暁, 小野靖
  • Organizer: 第38回プラズマ・核融合学会年会
• [Presentation] Global ion heating/transport during merging spherical tokamak formation (2021)
  • Author(s): H. Tanabe, Q. Cao, H. Tanaka, T. Ahmadi, A. Sawada, C.Z. Cheng and Y. Ono
  • Organizer: 28th IAEA Fusion Energy Conference (FEC 2020)
  • Int'l Joint Research
• [Presentation] Overview of Merging Spherical Tokamak Experiments and Simulations for Burning, High-Beta and/or Absolute Minimum-B Plasma Formation (2021)
  • Author(s): Y. Ono, M. Inomoto, H. Tanabe, H. Yamaguchi, M. Akimitsu, M. Gryaznevich, S. McNamara, P. Buxton, J. Kompulla, J.Wood, V. Nemytov, K. McClements, C.Z. Cheng, S. Usami and R. Horiuchi
  • Organizer: 28th IAEA Fusion Energy Conference (FEC 2020)
  • Int'l Joint Research
• [Presentation] Particle Simulation on Merging Processes of Two Spherical Tokamak-Type Plasmoids Confined in a Conducting Vessel (2021)
  • Author(s): S. Usami, R. Horiuchi, T. Moritaka, Y. Ono, M. Inomoto and H. Tanabe
  • Organizer: 28th IAEA Fusion Energy Conference (FEC 2020)
  • Int'l Joint Research
• [Remarks] 小野・井研究室ホームページ
  • URL: http://tanuki.t.u-tokyo.ac.jp/
• [Remarks] AAPPS-DPP Young Researcher (U40) Award受賞
  • URL: http://aappsdpp.org/DPP2021/2021prize/U40%20and%20U30(2021)J.pdf