非平衡プラズマの強相関乱流

• Project/Area Number: 15H02155
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Plasma science
• Research Institution: Kyushu University
• Principal Investigator: 伊藤 早苗 九州大学, 応用力学研究所, 協力研究員 (70127611)
• Co-Investigator(Kenkyū-buntansha): 小菅 佑輔 九州大学, 応用力学研究所, 准教授 (00700296) ; 小林 達哉 核融合科学研究所, ヘリカル研究部, 助教 (30733703) ; 伊藤 公孝 中部大学, 総合工学研究所, 特任教授 (50176327) ; 山田 琢磨 九州大学, 基幹教育院, 准教授 (90437773)
• Project Period (FY): 2015-04-01 – 2020-03-31
• Project Status: Granted(Fiscal Year 2018)
• Budget Amount: ¥36,530,000 (Direct Cost : ¥28,100,000、Indirect Cost : ¥8,430,000); Fiscal Year 2019 : ¥7,410,000 (Direct Cost : ¥5,700,000、Indirect Cost : ¥1,710,000); Fiscal Year 2018 : ¥6,890,000 (Direct Cost : ¥5,300,000、Indirect Cost : ¥1,590,000); Fiscal Year 2017 : ¥7,020,000 (Direct Cost : ¥5,400,000、Indirect Cost : ¥1,620,000); Fiscal Year 2016 : ¥6,760,000 (Direct Cost : ¥5,200,000、Indirect Cost : ¥1,560,000); Fiscal Year 2015 : ¥8,450,000 (Direct Cost : ¥6,500,000、Indirect Cost : ¥1,950,000)
• Keywords: プラズマ乱流 / 乱流競合過程 / 乱流構造 / 圧力と流速の勾配 / 強相関乱流 / 複数駆動源 / 強相関 / 非平衡プラズマ

Outline of Annual Research Achievements

圧力勾配や速度の不均一性等からプラズマ乱流が発達、巨視的な極性ベクトル場や軸性ベクトル場が確率的に生じ競合・干渉する。この研究計画では、それを「強相関乱流プラズマ」と定義し、多種の干渉しあう非線形過程を通じて生じる巨視的構造形成について研究する事を目的とする。
具体的な例として、密度勾配乱流により速度不均一が生じ、二重連結流が生まれることが示された。発達する二重連結流構造をトポロジカルインデックスで評価した。一方、密度勾配乱流がミクロな局所拡散的な輸送を生むだけではなく乱流塊の移送とともに大域的な輸送現象が生じることが知られているが、その時に、顕著な運動量輸送を生み、特異な流れ構造を生み出すことが見出された。流れ場の変動と乱流塊の移送メカニズムに関する研究も進めた。
非平衡性について加熱エネルギー源や密度補給源まで取り入れ、より広い自由度まで含めた研究への発展を始めた。一例として、高温プラズマ中の乱流駆動熱流が、局所的な拡散モデルに従わず、勾配―熱流関係にヒステリシスが現れることが近年知られて居る。それに着目することで周知の難問「閉じ込め時間の水素同位体効果」に理解が進むのではないかとの着想を得た。また、磁気アイランドという磁場のトポロジーが異なる状況で乱流と流れの結合がどのような様相を示すか、研究を進めた。磁場トポロジーによる揺動のモジュレーションと、帯状流のような流れによる乱流揺動のモジュレーションという、二つの非線形過程が共存競合する状況を観測することに成功し、研究の新展開を促した。
さらには、３次相関を観測することで、強相関乱流の様々な非線形相関・干渉効果を研究することが可能であることを説明し、実験家向きのまとめも発信した。

Current Status of Research Progress

1 :  Research has progressed more than it was originally planned.

Reason

密度勾配乱流により速度分布が急峻化し、速度勾配駆動乱流により密度分布が急峻になる過程をはじめ、スカラー場とベクトル場の乱流輸送干渉を実験的に検証するなど、大きな成果が得られて居る。異なる軸性ベクトル場の乱流輸送の干渉を観測する方法を提示するなどの成果も得られている。粒子補給が乱流揺動を駆動するなど新規な発想を含む研究が発展している。予想以上に進展して居ると結論する。

Strategy for Future Research Activity

今までの研究により成果が充実し、強相関乱流の性質や実験による確認法等の研究が大きく進んだ。当初計画に従い、複数の揺動や流れの干渉と競合、非線形散逸率の理論と実験との比較、粒子や運動量の流束の観測と因果関係の検定、などの課題に研究成果が得られて来た。クロスバイスペクトルに着目した実験研究法のレビューも出版した。
今年度には、密度勾配や磁場方向流れ場勾配が駆動する揺動（ドリフト波やD’Angeloモード）、そしてメソスケールやマクロスケールをもつ揺動が混在する多スケール乱流が発達する問題に取り組み、幅広い状況を対象に、理論研究を展開する。状態の遷移や選択則を、流れのトポロジカルインデックスとして評価する方法を得たが、その定式化により普遍的な見通しが得られるか否かにチャレンジする。研究対象もさらに一般化する。今までの研究は、流れ場構造が軸対称性を持つ場合を中心に研究して来た。一方、多種流れの勾配が共存する状況での研究を進めた結果、流れ場が対称性を破り、ストリーマーのような局在構造を作り、帯状流構造と競合する可能性がある。こうした状況の研究にも着手する。位相空間の自由度の効果も検討する。
強相関乱流を考察するための切り口として、非平衡性の特徴を、多種の勾配と流れの共存と言う視野から研究してきたが、それに留まらず、外部からの供給源（外部加熱や粒子補給）を含むべく拡張も試みる。
実験では、基礎実験装置PANTAや乱流計測シミュレータを活用する。周波数および空間のなかで、乱流構造の選択則の検証に着手する。一方、本研究計画の成果に基づき、大型閉じ込め実験装置での複数の流れ勾配の競合による新たな動的応答の可能性が指摘され、ストリーマーの発生の観測を指導した。それらの国際的共同実験観測の解析を進める。

Research Products

• [Int'l Joint Research] Southwestern Institute of Physics/Zhejiang University/Dalian University(China)
• [Int'l Joint Research] Lorraine University/CEA(France)
• [Int'l Joint Research] UCSD/GA(USA)
• [Int'l Joint Research] Max-Planck-institute for Plasma Physics/Technische Univ. Munchen(Germany)
• [Int'l Joint Research] CIEMAT(Spain)
• [Int'l Joint Research]
• [Journal Article] Transport hysteresis and hydrogen isotope effect on confinement (2018)
  • Author(s): Itoh S-I、Itoh K
  • Journal Title: Plasma Physics and Controlled Fusion Volume : 60
  • DOI: 10.1088/1361-6587/aaa2ed
  • Peer Reviewed
• [Journal Article] Spatio-temporal dynamics of turbulence trapped in geodesic acoustic modes (2018)
  • Author(s): Sasaki M.、Kobayashi T.、Itoh K.、Kasuya N.、Kosuga Y.、Fujisawa A.、Itoh S.-I.
  • Journal Title: Physics of Plasmas Volume : 25
  • DOI: 10.1063/1.5008541
  • Peer Reviewed
• [Journal Article] Quantification of turbulent driving forces for geodesic acoustic mode in JFT-2M tokamak (2018)
  • Author(s): T. Kobayashi, M. Sasaki, T. Ido, K. Kamiya, Y. Miura, Y. Nagashima, K. Ida, S. Inagaki, A. Fujisawa, S.-I. Itoh, and K. Itoh
  • Journal Title: Physical Review Letter Volume : 120 Pages : 045002-045002
  • DOI: 10.1103/physrevlett.120.045002
  • Peer Reviewed
• [Journal Article] Three-Dimensional Structure of the Streamer in Linear Plasmas (2018)
  • Author(s): Yamada Takuma、Inagaki Shigeru、Sasaki Makoto、Nagashima Yoshihiko、Kin Fumiyoshi、Arakawa Hiroyuki、Kobayashi Tatsuya、Yamasaki Kotaro、Kasuya Naohiro、Kosuga Yusuke、Fujisawa Akihide、Itoh Kimitaka、Itoh Sanae-I.
  • Journal Title: Journal of the Physical Society of Japan Volume : 87 Pages : 034501-034501
  • DOI: 10.7566/jpsj.87.034501
  • Peer Reviewed
• [Journal Article] Position Identification of Measurement for the Study of Symmetry-Breaking of Turbulence Structure in Toroidal Plasmas (2018)
  • Author(s): Itoh Kimitaka、Itoh Sanae-I.、Nagashima Yoshihiko、Yamada Takuma、Fujisawa Akihide
  • Journal Title: Journal of the Physical Society of Japan Volume : 87 Pages : 025002-025002
  • DOI: 10.7566/jpsj.87.025002
  • Peer Reviewed
• [Journal Article] Effects of hydrogen isotope in coupling between confinement, wall material and SoL turbulence, (2017)
  • Author(s): Kimitaka Itoh, Sanae-I; Itoh, Makoto Sasaki, Yusuke Kosuga,
  • Journal Title: Null Fusion Volume : 57 Pages : 056031-056031
  • DOI: 10.1088/1741-4326/aa65eb
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On the Application of Cross Bispectrum and Cross Bicoherence (2017)
  • Author(s): S.-I. Itoh, K. Itoh, Y. Nagashima and Y. Kosuga
  • Journal Title: Plasma Fus. Research Volume : 12 Pages : 1101003-1101003
  • DOI: 10.1585/pfr.12.1101003
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Zonal flow generation in parallel flow shear driven turbulence (2017)
  • Author(s): Y. Kosuga , S.-I. Itoh , K. Itoh
  • Journal Title: Phys. Plasmas Volume : 24 Pages : 032304-032304
  • DOI: 10.1063/1.4978485
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Role of phase space structures in collisionless drift wave turbulence and impact on transport modeling (2017)
  • Author(s): Y. Kosuga , S.-I. Itoh , P.H. Diamond , K. Itoh , M. Lesur
  • Journal Title: Nucl. Fusion Volume : 57 Pages : 072006-072006
  • DOI: 10.1088/1741-4326/57/7/072006
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Multiple-Instabilities in Magnetized Plasmas with Density Gradient and Velocity Shears (2017)
  • Author(s): Sasaki M.、Kasuya N.、Toda S.、Yamada T.、Kosuga Y.、Arakawa H.、Kobayashi T.、Inagaki S.、Fujisawa A.、Nagashima Y.、Itoh K.、Itoh S.-I.
  • Journal Title: Plasma and Fusion Research Volume : - Pages : 1401042-1401042
  • DOI: 10.1585/pfr.12.1401042
  • Peer Reviewed / Open Access
• [Journal Article] Topological bifurcation of helical flows in magnetized plasmas with density gradient and parallel flow shear (2017)
  • Author(s): Sasaki M.、Kasuya N.、Itoh K.、Toda S.、Yamada T.、Kosuga Y.、Nagashima Y.、Kobayashi T.、Arakawa H.、Yamasaki K.、Fujisawa A.、Inagaki S.、Itoh S.-I.
  • Journal Title: Physics of Plasmas Volume : 24 Pages : 112103-112103
  • DOI: 10.1063/1.5000343
  • Peer Reviewed
• [Journal Article] Enhancement and suppression of turbulence by energetic-particle-driven geodesic acoustic modes (2017)
  • Author(s): Sasaki M.、Itoh K.、Hallatschek K.、Kasuya N.、Lesur M.、Kosuga Y.、Itoh S.-I.
  • Journal Title: Scientific Reports Volume : 7
  • DOI: 10.1038/s41598-017-17011-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] How turbulence fronts induce plasma spin-up (2017)
  • Author(s): Y. Kosuga, S.-I. Itoh, P.H. Diamond, K. Itoh
  • Journal Title: Phys. Rev. E Volume : 95
  • DOI: 10.1103/physreve.95.031203
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] How pattern is selected in drift wave turbulence: Role of parallel flow shear (2017)
  • Author(s): Kosuga Y.
  • Journal Title: Physics of Plasmas Volume : 24
  • DOI: 10.1063/1.5001857
  • Peer Reviewed
• [Journal Article] Model validation for radial electric field excitation during L?H transition in JFT-2M tokamak (2017)
  • Author(s): Kobayashi T.、Itoh K.、Ido T.、Kamiya K.、Itoh S.-I.、Miura Y.、Nagashima Y.、Fujisawa A.、Inagaki S.、Ida K.、Hoshino K.
  • Journal Title: Nuclear Fusion Volume : 57
  • DOI: 10.1088/1741-4326/aa5d03
  • Peer Reviewed
• [Journal Article] Observation of subcritical geodesic acoustic mode excitation in the large helical device (2017)
  • Author(s): Ido T.、Itoh K.、Lesur M.、Osakabe M.、Shimizu A.、Ogawa K.、Nishiura M.、Yamada I.、Yasuhara R.、Kosuga Y.、Sasaki M.、Ida K.、Inagaki S.、Itoh S.-I.、the LHD Experiment Group
  • Journal Title: Nucl. Fusion Volume : 57 Pages : 72009-72009
  • DOI: 10.1088/1741-4326/aa665a
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Mesoscale electric fluctuations interacting with zonal flows, magnetic fluctuations, and turbulence (2017)
  • Author(s): K. Zhao, Y. Nagashima, P. H. Diamond, J. Dong, K. Kimitaka, S.-I. Itoh, L. Yan, J. Cheng, A. Fujisawa, S. Inagaki, Y. Kosuga, M. Sasaki, Z. Huang, D. Yu, Q. Li, X. Ji, X. Song, Y. Huang, Y. Liu, Q. Yang, X. Ding, X. Duan
  • Journal Title: Nuclear Fusion Volume : 57
  • DOI: 10.1088/1741-4326/aa6f35
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Temporal-spatial structures of plasmas flows and turbulence around tearing mode islands in the edge tokamak plasmas (2017)
  • Author(s): K. Zhao, Y. Nagashima, F. Li, Y. Shi, P. H. Diamond, J. Dong, K. Itoh, S.-I. Itoh, G. Zhuang, H. Liu, Z. Chen, J. Cheng, L. Nie, Y. Ding, Q. Hu, Z. Chen, B. Rao, Z. Cheng, L. Gao, X. Zhang, Z. J. Yang, N. Wang, L. Wang, W. Jin, W. Yan, J. Xu, Y. Wu, L. Yan, A. Fujisawa, S. Inagaki, Y. Kosuga, M. Sasaki
  • Journal Title: Nuclear Fusion Volume : 57
  • DOI: 10.1088/1741-4326/aa8341
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Analysis of higher harmonics on bidirectional heat pulse propagation experiment in helical and tokamak plasmas (2017)
  • Author(s): Kobayashi T.、Ida K.、Inagaki S.、Tsuchiya H.、Tamura N.、Choe G.H.、Yun G.S.、Park H.K.、Ko W.H.、Evans T.E.、Austin M.E.、Shafer M.W.、Ono M.、L?pez-bruna D.、Ochando M.A.、Estrada T.、Hidalgo C.、Moon C.、Igami H.、Yoshimura Y.、Tsujimura T.Ii.、Itoh S.-I.、Itoh K.
  • Journal Title: Nuclear Fusion Volume : 57 Pages : 076013-076013
  • DOI: 10.1088/1741-4326/aa6f1f
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Method for Estimating Harmonic Frequency Dependence of Diffusion Coefficient and Convective Velocity in Heat Pulse Propagation Experiment Tatsuya (2017)
  • Author(s): Tatsuya Kobayashi, Kimitaka Itoh, Katsumi Ida, Shigeru Inagaki, Sanae-I. Itoh
  • Journal Title: Journal of the Physical Society Japan Volume : 86 Pages : 074501-074501
  • DOI: 10.7566/jpsj.86.074501
  • Peer Reviewed
• [Journal Article] Hysteresis and Fast Timescale in Transport Relation of Toroidal Plasmas (2017)
  • Author(s): K. Itoh, S.-I. Itoh, K. Ida, S. Inagaki, Y. Kamada, K. Kamiya, J. Dong, C. Hidalgo, T. Evans, W. Ko, H. Park, T. Tokuzawa, S. Kubo, T. Kobayashi, Y. Kosuga, M. Sasaki, G. Yun, S. Song, N. Kasuya, Y. Nagashima, C. Moon, M. Yoshinuma, R. Makino, T. Tsujimura, H. Tsuchiya, U. Stroth
  • Journal Title: Nuclear Fusion Volume : 57 Pages : 1020211-7
  • DOI: 10.1088/1741-4326/aa796a
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Reduction of ion thermal transport due to non-uniformity effects of the radial electric field at the edge of the JT-60U tokamak (2017)
  • Author(s): Kamiya K.、Itoh K.、Itoh S.-I.
  • Journal Title: Nuclear Fusion Volume : 57
  • DOI: 10.1088/1741-4326/aa7f3b
  • Peer Reviewed
• [Journal Article] Turbulent transport reduction induced by transition on radial electric field shear and curvature through amplitude and cross-phase in torus plasma (2017)
  • Author(s): Kobayashi T.、Itoh K.、Ido T.、Kamiya K.、Itoh S.-I.、Miura Y.、Nagashima Y.、Fujisawa A.、Inagaki S.、Ida K.
  • Journal Title: Scientific Reports Volume : 7 Pages : 14971-14971
  • DOI: 10.1038/s41598-017-14821-y
  • Peer Reviewed / Open Access
• [Journal Article] Role of electric field curvature in the formation of edge transport barrier in the JT-60U tokamak (2017)
  • Author(s): Kamiya K、Itoh K、Itoh S-I、Ida K、Kobayashi T
  • Journal Title: Plasma Physics and Controlled Fusion Volume : 60
  • DOI: 10.1088/1361-6587/aa8a01
  • Peer Reviewed
• [Journal Article] Phenomenological Classification of Turbulence States in Linear Magnetized Plasma PANTA (2017)
  • Author(s): Kobayashi T.、Inagaki S.、Kosuga Y.、Sasaki M.、Nagashima Y.、Yamada T.、Arakawa H.、Kasuya N.、Fujisawa A.、Itoh S.-I. 、Itoh K.
  • Journal Title: Plasma and Fusion Research Volume : - Pages : 1401019-1401019
  • DOI: 10.1585/pfr.12.1401019
  • Peer Reviewed / Open Access
• [Journal Article] Nonlinear Coupling of Drift Waves and High Frequency Fluctuation on PANTA (2017)
  • Author(s): HASAMADA Kazunobu、KOSUGA Yusuke、KIN Fumiyoshi、INAGAKI Sigeru、NAGASHIMA Yoshihiko、KOBAYASHI Tatsuya、SASAKI Makoto、KASUYA Naohiro、YAMASAKI Kotaro、ITOH Sanae-I.、ITOH Kimitaka、FUJISAWA Akihide
  • Journal Title: Plasma and Fusion Research Volume : 12 Pages : 12010341-3
  • DOI: 10.1585/pfr.12.1201034
  • Peer Reviewed / Open Access
• [Journal Article] Effects of radial electric field on suppression of electron-temperature-gradient mode through multiscale nonlinear interactions (2017)
  • Author(s): C. Moon, T. Kaneko, K. Itoh, K. Ida, T. Kobayashi, S. Inagaki, S.-I. Itoh & R. Hatakeyama
  • Journal Title: Plasma Phys. Contr. Fusion Volume : 58 Pages : 105007-105007
  • DOI: 10.1088/0741-3335/58/10/105007
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Transport hysteresis of core plasma, isotope effect, and H-mode physics (2017)
  • Author(s): S.-I. Itoh, K. Itoh and S. Inagaki
  • Journal Title: Nuclear Fusion Volume : 57 Pages : 022003-022003
  • DOI: 10.1088/0029-5515/57/2/022003
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On the width of a pedestal in the H-mode (2017)
  • Author(s): K. Itoh, S.-I. Itoh, K. Kamiya and T. Kobayashi
  • Journal Title: Nuclear Fusion Volume : 57
  • DOI: 10.1088/0029-5515/57/2/022005
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Toroidal momentum channeling of geodesic acoustic modes driven by fast ions (2017)
  • Author(s): M. Sasaki, N. Kasuya, K. Itoh, Y. Kosuga, M. Lesur, K. Hallatschek and S.-I. Itoh
  • Journal Title: Nuclear Fusion Volume : 57 Pages : 036025-036025
  • DOI: 10.1088/1741-4326/aa4eb4
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A simple model for electron dissipation in trapped ion turbulence (2017)
  • Author(s): M. Lesur, T. Cartier-Michaud, T. Drouot, P. H. Diamond, Y. Kosuga, T. R´eveill´e, E. Gravier, X. Garbet, S.-I. Itoh and K. Itoh
  • Journal Title: Physics of Plasmas Volume : 24 Pages : 012511-012511
  • DOI: 10.1063/1.4974269
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Phenomenological classification of turbulence states in linear magnetized plasma PANTA (2017)
  • Author(s): T. Kobayashi, S. Inagaki, M. Sasaki, Y. Kosuga, H. Arakawa, F. Kin, T. Yamada, Y. Nagashima, N. Kasuya, A. Fujisawa, S.-I. Itoh and K. Itoh
  • Journal Title: Plasma and Fusion Research Volume : 印刷中
  • Acknowledgement Compliant
• [Journal Article] Reconstruction of high temporal resolution Thomson scattering data during a modulated electron cyclotron resonance heating using conditional averaging (2016)
  • Author(s): T. Kobayashi, K. Ida, K. Itoh, M. Yoshinuma, C. Moon, S. Inagaki, I. Yamada, H. Funaba, R. Yasuhara, S. Ohdachi, Y. Yoshimura, H. Igami, T. Shimozuma, S. Kubo, T. I. Tsujimura and LHD experiment group
  • Journal Title: Review of Scientific Instruments Volume : 87 Pages : 043505-043505
  • DOI: 10.1063/1.4945258
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Improvement of the Reynolds stress probe for end-plate biasing experiment in a cylindrical laboratory plasma (2016)
  • Author(s): T. Kanzaki, Y. Nagashima, S. Inagaki, F. Kin, Y. Miwa, M. Sasaki, T. Yamada, A. Fujisawa, T. Kobayashi, N. Kasuya, Y. Kosuga, S.-I. Itoh and K. Itoh
  • Journal Title: Plasma and Fusion Research Volume : 11 Pages : 1201091-1201091
  • DOI: 10.1585/pfr.11.1201091
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] On the origin of steep and localized radial electric field in the transport barrier at plasma edge (2016)
  • Author(s): K. Itoh, S.-I. Itoh, T. Kobayashi, K. Kamiya, T. Ido, T. Tokuzawa, S. Inagaki, N. Kasuya
  • Journal Title: Contrib. Plasma Phys. Volume : - Pages : 522-527
  • DOI: 10.1002/ctpp.201610042
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Turbulence Dynamics with the Coupling of Density Gradient and Parallel Velocity Gradient in the Edge Plasmas (2016)
  • Author(s): Y. Kosuga, S.-I. Itoh and K. Itoh
  • Journal Title: Contributions to Plasma Physics Volume : 56 Pages : 511-515
  • DOI: 10.1002/ctpp.201610047
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Experimental validation of non-uniformity effect of the radial electric field on the edge transport barrier formation in JT-60U H-mode plasmas (2016)
  • Author(s): K. Kamiya, K. Itoh and S.-I. Itoh
  • Journal Title: Scientific Reports Volume : 6 Pages : 30585-30585
  • DOI: 10.1038/srep30585
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Experimental Identification of Electric Field Excitation Mechanisms in a Structural Transition of Tokamak Plasmas (2016)
  • Author(s): T. Kobayashi, K. Itoh, T. Ido, K. Kamiya, S.-I. Itoh, Y. Miura, Y. Nagashima, A. Fujisawa, S. Inagaki, K. Ida and K. Hoshino
  • Journal Title: Scientific Reports Volume : 6 Pages : 30720-30720
  • DOI: 10.1038/srep30720
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Ion internal transport barrier in neutral beam heated plasmas on HL-2A (2016)
  • Author(s): Yu, Deliang; Wei, Yanling; Liu, Liang; Dong, Jiaqi; Ida, Katsumi; Itoh, Kimitaka; et al.
  • Journal Title: Nucl. Fusion Volume : 56
  • DOI: 10.1088/0029-5515/56/5/056003
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Hydrogen isotope effect on the Dimits shift (2016)
  • Author(s): S.-I. Itoh and K. Itoh
  • Journal Title: Nuclear Fusion Volume : 56
  • DOI: 10.1088/0029-5515/56/10/106028
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] On Magnetic Signals of a Large-Scale Quasi-electrostatic Perturbation (2016)
  • Author(s): K. Itoh, S.-I. Itoh, K. Ida and Y. Kosuga
  • Journal Title: Journal of the Physical Society of Japan Volume : 85 Pages : 094504-094504
  • DOI: 10.7566/jpsj.85.094504
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Eddy, drift wave and zonal flow dynamics in a linear magnetized plasma (2016)
  • Author(s): H. Arakawa, S. Inagaki, M. Sasaki, Y. Kosuga, T. Kobayashi, N. Kasuya, Y. Nagashima, T. Yamada, M. Lesur, A. Fujisawa, S. -I. Itoh and K. Itoh
  • Journal Title: Scientific Reports Volume : 6 Pages : 33371-33371
  • DOI: 10.1038/srep33371
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Synchronization of Geodesic Acoustic Modes and Magnetic Fluctuations in Toroidal Plasmas (2016)
  • Author(s): K. J. Zhao, Y. Nagashima, P. H. Diamond, J. Q. Dong, K. Itoh, S.-I. Itoh, L. W. Yan, J. Cheng, A. Fujisawa, S. Inagaki, Y. Kosuga, M. Sasaki, Z.X. Wang, L. Wei, Z. H. Huang, D.L. Yu, W. Y. Hong, Q. Li, X. Q. Ji, X. M. Song,Y. Huang, Yi. Liu, Q. W. Yang, X. T. Ding and X. R. Duan
  • Journal Title: Physical Review Letters Volume : 117 Pages : 145002-145002
  • DOI: 10.1103/physrevlett.117.145002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A branch of energetic-particle driven geodesic acoustic modes due to magnetic drift resonance (2016)
  • Author(s): M. Sasaki, N. Kasuya, K. Hallatschek, K. Itoh, Y. Kosuga and S.-I. Itoh
  • Journal Title: Physics of Plasmas Volume : 23 Pages : 102501-102501
  • DOI: 10.1063/1.4963397
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Observation of the inward propagation of spontaneous toroidal flow from the plasma boundary in LHD (2016)
  • Author(s): K. Kamiya, K. Ida, K. Itoh, S.-I. Itoh, M. Yoshinuma, M. Yokoyama, S. Kubo, H. Tsuchiya, N. Tamura, S. Masuzaki, C. Suzuki, T. Akiyama and LHD experiment group
  • Journal Title: Physics of Plasmas Volume : 23 Pages : 102309-102309
  • DOI: 10.1063/1.4965908
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Structure formation in parallel ion flow and density profiles by cross-ferroic turbulent transport in linear magnetized plasma (2016)
  • Author(s): T. Kobayashi, S. Inagaki, Y. Kosuga, M. Sasaki, Y. Nagashima, T. Yamada, H. Arakawa, N. Kasuya, A. Fujisawa, S.-I. Itoh and K. Itoh
  • Journal Title: Physics of Plasmas Volume : 23 Pages : 102311-102311
  • DOI: 10.1063/1.4965915
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Abrupt onset of tongue deformation and phase space response of ions in magnetically-confined plasmas (2016)
  • Author(s): K. Ida, T. Kobayashi, K. Itoh, M. Yoshinuma, T. Tokuzawa, T. Akiyama, C. Moon, H. Tsuchiya, S. Inagaki and S.-I. Itoh
  • Journal Title: Scientific Reports Volume : 6 Pages : 36217-36217
  • DOI: 10.1038/srep36217
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Strong Destabilization of Stable Modes with a Half-Frequency Associated with Chirping Geodesic Acoustic Modes in the Large Helical Device (2016)
  • Author(s): T. Ido, K. Itoh, M. Osakabe, M. Lesur, A. Shimizu, K. Ogawa, K. Toi, M. Nishiura, S. Kato, M. Sasaki, K. Ida, S. Inagaki, S.-I. Itoh, and the LHD Experiment Group
  • Journal Title: Physical Review Letters Volume : 116 Pages : 015002-015002
  • DOI: 10.1103/physrevlett.116.015002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Nonlinear Excitation of Subcritical Instabilities in a Toroidal Plasma (2016)
  • Author(s): M. Lesur, K. Itoh, T. Ido, M. Osakabe, K. Ogawa, A. Shimizu, M. Sasaki, K. Ida, S. Inagaki, S.-I. Itoh, and the LHD Experiment Group
  • Journal Title: Physical Review Letters Volume : 116 Pages : 015003-015003
  • DOI: 10.1103/physrevlett.116.015003
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] On the Study of Higher Harmonics of Heat Pulse Propagation in the Modulated-Heating Experiments (2016)
  • Author(s): K. Itoh, S.-I. Itoh, S. Inagaki, N. Kasuya, A. Fujisawa
  • Journal Title: J. Phys. Soc. Jpn. Volume : 85 Pages : 0145011-6
  • DOI: 10.7566/jpsj.85.014501
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] A Concept of Cross-Ferroic Plasma Turbulence (2016)
  • Author(s): S. Inagaki, T. Kobayashi, Y. Kosuga, S.-I. Itoh, T. Mitsuzono, Y. Nagashima, H. Arakawa, T. Yamada, Y. Miwa, N. Kasuya, M. Sasaki, M. Lesur, A. Fujisawa, K. Itoh
  • Journal Title: Scientific Reports Volume : 6 Pages : 221891-6
  • DOI: 10.1038/srep22189
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A calibration of setting of mach probes by observing GAM oscillations (2016)
  • Author(s): K. Itoh, K. Zhao, J. Dong, S.-I. Itoh, A. Fujisawa, S. Inagaki, M. Sasaki, Y. Nagashima, Y. Kosuga, J. Cheng, T. Kobayashi
  • Journal Title: Plasma Fusion Res. Volume : 11
  • DOI: 10.1585/pfr.11.1402002
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Flux of Parallel Flow Momentum by Parallel Shear Flow Driven Instability (2016)
  • Author(s): Y. Kosuga, S.-I. Itoh, K. Itoh
  • Journal Title: Plasma Fusion Res. Volume : 11
  • DOI: 10.1585/pfr.11.1203018
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] A structural bifurcation of transport in toroidal plasmas (2016)
  • Author(s): K. Itoh and S.-I. Itoh
  • Journal Title: Plasma Phys. Control. Fusion Volume : 58
  • DOI: 10.1088/0741-3335/58/4/045017
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Contribution of geodesic acoustic modes in the limit cycle oscillation near H-mode transition in JFT-2M plasmas (2015)
  • Author(s): K. Itoh, T. Kobayashi, T. Ido, S.-I. Itoh, K. Kamiya
  • Journal Title: Plasma Phys. Control. Fusion Volume : 57
  • DOI: 10.1088/0741-3335/57/9/092001
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Azimuthal inhomogeneity of turbulence structure and its impact on intermittent particle transport in linear magnetized plasmas (2015)
  • Author(s): T. Kobayashi, S. Inagaki, M. Sasaki, Y. Kosuga, H. Arakawa, T. Yamada, Y. Nagashima, Y. Miwa, N. Kasuya, A. Fujisawa, S.-I. Itoh, K. Itoh
  • Journal Title: Phys. Plasmas Volume : 22 Pages : 1123011-8
  • DOI: 10.1063/1.4934537
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Hydrogen Isotope Effect on Confinement (2017)
  • Author(s): S.-I. Itoh, K. Itoh
  • Organizer: 7th Asia-Pacific Transport Working Group (APTWG) Meeting
• [Presentation] Transport Hysteresis and Hydrogen Isotope Effect on Confinement (2017)
  • Author(s): S.-I. Itoh and K. Itoh
  • Organizer: PLASMA Conference 2017
• [Presentation] 平行流れシアが駆動する乱流における対流胞 (2017)
  • Author(s): 小菅佑輔、伊藤早苗、伊藤公孝、佐々木真
  • Organizer: 日本物理学会第72回年次大会
  • Place of Presentation: 大阪大学（大阪府）
  • Year and Date: 2017-03-17
• [Presentation] JFT-2MトカマクにおけるLH遷移時の電場形成の物理機構 (2016)
  • Author(s): 小林達哉, 伊藤公孝 井戸毅, 神谷健作, 伊藤早苗, 三浦幸俊, 永島芳彦, 藤澤彰英, 稲垣滋, 居田克巳, 星野克道
  • Organizer: 第33回プラズマ・核融合学会年会
  • Place of Presentation: 東北大学（宮城県）
  • Year and Date: 2016-11-29
• [Presentation] Hysteresis and Fast Timescale in Transport Relation of Toroidal Plasmas (2016)
  • Author(s): K. Itoh, S.-I. Itoh, K. Ida, S. Inagaki, Y. Kamada, K. Kamiya, J. Q. Dong, C. Hidalgo, T. Evans, W. H. Ko, H. Park, T. Tokuzawa, S. Kubo, T. Kobayashi, Y. Kosuga, M. Sasaki, G. S. Yun, S. D. Song, N. Kasuya, Y. Nagashima, C. Moon, M. Yoshinuma, R. Makino, T. Tsujimura, H. Tsuchiya, U. Stroth
  • Organizer: 26th IAEA Fusion Energy Conference
  • Place of Presentation: 国立京都国際会館（京都府）
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] 磁場方向流れ場駆動乱流の波数スペクトル時間発展 (2016)
  • Author(s): 小菅佑輔、伊藤早苗、伊藤公孝
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（石川県）
  • Year and Date: 2016-09-13
• [Presentation] Dimits shiftへの水素同位体効果 (2016)
  • Author(s): 伊藤早苗、伊藤公孝
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（石川県）
  • Year and Date: 2016-09-13
• [Presentation] スケール混合と輸送障壁の構造 (2016)
  • Author(s): 伊藤公孝、伊藤早苗、小林達哉、神谷健作
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学（石川県）
  • Year and Date: 2016-09-13
• [Presentation] Role of granula,ons in phase space turbulence (2016)
  • Author(s): Y. Kosuga
  • Organizer: The 18th International Congress on Plasma Physics (ICPP 2016)
  • Place of Presentation: 台湾
  • Year and Date: 2016-06-27
  • Int'l Joint Research / Invited
• [Presentation] Spatio-temporal dynamics of L-H transition - An advanced data analysis (2016)
  • Author(s): T. Kobayashi, K. Itoh, T.Ido, K. Kamiya, S.-I. Itoh, Y. Miura, Y. Nagashima, A. Fujisawa, S. Inagaki, K.Ida and K. Hoshino
  • Organizer: The 18th International Congress on Plasma Physics (ICPP 2016)
  • Place of Presentation: 台湾
  • Year and Date: 2016-06-27
  • Int'l Joint Research / Invited
• [Presentation] プラズマの輸送に現れるヒステリシスと強相関性 (2016)
  • Author(s): 伊藤早苗、稲垣滋、小菅佑輔、小林達哉、伊藤公孝
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス
  • Year and Date: 2016-03-19
• [Presentation] 強相関乱流 (2015)
  • Author(s): 伊藤早苗、 稲垣滋、 伊藤公孝、 糟谷直宏、 小菅佑輔、 佐々木真、 小林達哉、 居田克巳
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学千里山キャンパス
  • Year and Date: 2015-09-16
• [Presentation] Turbulence Dynamics with the coupling of density gradient and parallel velocity gradient in the edge plasma (2015)
  • Author(s): Y. Kosuga, S.-I. Itoh, K. Itoh
  • Organizer: 15th International Workshop on Plasma Edge Theory in Fusion Devices
  • Place of Presentation: Nara, Japan
  • Year and Date: 2015-09-09
  • Int'l Joint Research
• [Presentation] On the origin of steep radial electric field in the transport barrier at plasma edge (2015)
  • Author(s): K. Itoh, S.-I. Itoh, K. Kamiya, T. Ido, T. Tokuzawa, S. Inagaki, N. Kasuya
  • Organizer: 15th International Workshop on Plasma Edge Theory in Fusion Devices
  • Place of Presentation: Nara, Japan
  • Year and Date: 2015-09-09
  • Int'l Joint Research / Invited
• [Presentation] On immediate influence of source input on edge-core coupling (2015)
  • Author(s): S.-I. Itoh, K. Itoh, S. Inagaki, Y. Kosuga
  • Organizer: 15th International Workshop on Plasma Edge Theory in Fusion Devices
  • Place of Presentation: Nara, Japan
  • Year and Date: 2015-09-09
  • Int'l Joint Research
• [Presentation] Inward particle flux driven by parallel flow shear driven instability (2015)
  • Author(s): Y. Kosuga
  • Organizer: 8th Festival de Theorie
  • Place of Presentation: Aix-en-Provence, France
  • Year and Date: 2015-07-08
  • Int'l Joint Research / Invited
• [Presentation] On the spatial structure of solitary radial electric field at the plasma edge in toroidal confinement devices (2015)
  • Author(s): K. Itoh, S.-I. Itoh, K. Kamiya, N. Kasuya
  • Organizer: The 5th Asia-Pacific Transport Working Group International Conference (APTWG)
  • Place of Presentation: Dalian, China
  • Year and Date: 2015-06-09
  • Int'l Joint Research
• [Presentation] Hysteresis in Gradient-Flux Relation of Core Plasmas (2015)
  • Author(s): S.-I. Itoh, K. Itoh, S. Inagaki, N. Kasuya
  • Organizer: The 5th Asia-Pacific Transport Working Group International Conference (APTWG)
  • Place of Presentation: Dalian, China
  • Year and Date: 2015-06-09
  • Int'l Joint Research
• [Presentation] Inward particle flux driven by parallel flow shear driven instability (2015)
  • Author(s): Y. Kosuga, S.-I. Itoh, K. Itoh
  • Organizer: The 5th Asia-Pacific Transport Working Group International Conference (APTWG)
  • Place of Presentation: Dalian, China
  • Year and Date: 2015-06-09
  • Int'l Joint Research
• [Presentation] Changes of Particle Flux during End-Plate Biasing Experiment in PANTA (2015)
  • Author(s): F. Kin, T. Yamada, S. Inagaki, H. Arakawa, T. Kobayashi, Y. Nagashima, N. Kasuya, A. Fujisawa, Y. Miwa, H. Kono, T. Mizokami, M. Sasaki, M. Lesur, Y. Kosuga, K. Itoh, S.-I. Itoh
  • Organizer: The 5th Asia-Pacific Transport Working Group International Conference (APTWG)
  • Place of Presentation: Dalian, China
  • Year and Date: 2015-06-09
  • Int'l Joint Research