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アルヴェン固有モード・センシングシステムによるアルファ粒子損失機構の研究

Research Project

Project/Area Number 16082209
Research Category

Grant-in-Aid for Scientific Research on Priority Areas

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionNational Institute for Fusion Science

Principal Investigator

東井 和夫  National Institute for Fusion Science, 大型ヘリカル研究部, 教授 (20093057)

Co-Investigator(Kenkyū-buntansha) 大舘 暁  核融合科学研究所, 大型ヘリカル研究部, 助教 (00270489)
榊原 悟  核融合科学研究所, 大型ヘリカル研究部, 准教授 (90280594)
武智 学  日本原子力研究開発機構, 核融合研究開発部門, 研究員 (40370423)
Project Period (FY) 2004 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥59,700,000 (Direct Cost: ¥59,700,000)
Fiscal Year 2007: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2006: ¥9,400,000 (Direct Cost: ¥9,400,000)
Fiscal Year 2005: ¥19,800,000 (Direct Cost: ¥19,800,000)
Fiscal Year 2004: ¥26,900,000 (Direct Cost: ¥26,900,000)
Keywordsプラズマ・核融合 / アルファ粒子 / 高速イオン / アルヴェン固有モード / TAE / 高速粒子モード / 損失イオンプローブ / ピッチ角 / アルヴェン波 / MHDモード / シアアルヴェンスペクトル / 高速イオン損失 / 摂動高周波磁場 / ラーマ半径 / 磁気プローブ / 荷電交換中性粒子束
Research Abstract

本研究では、トーラスプラズマにおけるアルファ粒子によるアルヴェン固有モード(AE)の励起とAEの高速イオン輸送に及ぼす影響を明らかにすることを目指し、LHDやCHSなどのヘリカル装置とJT-60Uトカマクにおいて中性ビーム入射(NBI)で生成した高速イオンによるAE励起とAEの高速イオン輸送への影響の解明、及びAEの安定性評価に重要な減衰率の測定と減衰機構の解明を進めている。主要な成果は下記の通りである。(1)CHSにおいてプラズマ周辺部へ挿入可能な方向性プローブとプラズマ外に設置したシンチレータ型損失高速イオンプローブによる測定から、高速イオンにより励起された高速粒子モード(EPM)によりプラズマ内部からプラズマ外へ輸送される高速イオン束を観測し損失機構を明らかにした。(2)JT-60UトカマクではAEによる高速イオン輸送を中性子放射の径方向分布から導出し、高速イオンの磁場リップル輸送の理論との比較からAEの影響を定量的に評価した。(3)LHDでは、NBI電流駆動により非単調回転変換分布を生成したとき、トカマクの反転磁気シアAEに類似したアルヴェン固有モードが励起されることを見出した。(4)AEやEPMは高速イオンにより不安定化されるが、CHSでは電子サイクロトロン加熱で生成したヘリカル磁場リップルに捕捉された高速電子も高速イオンと同様にAEやEPMを励起できることを明らかにし、高速電子励起のバースト的EPMを観測した。高速電子の軌道計算からこのような励起の可能性を明らかにした。(5)CHSではアンテナにより10kHzから300kHzまでの交流磁場印加によりプラズマ周辺部でTAEを励起し、減衰率を測定した。減衰率は固有周波数の10-20%と相当高く連続スペクトル減衰が重要と考えられる。当初の目的とした成果に加え、新たな興味深い成果が得られた。

Report

(4 results)
  • 2007 Annual Research Report
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (22 results)

All 2008 2007 2006 2005

All Journal Article (15 results) (of which Peer Reviewed: 6 results) Presentation (7 results)

  • [Journal Article] Radial Transport Characteristics of Fast Ions Due to Energetic-Particle Modes insi de the last Closed-Flux Surface in the Compact Helical System2008

    • Author(s)
      K. Nagaoka, M. Isobe, K. Tbi, A. Shimizu, A. Fujisama, et. al.
    • Journal Title

      Physical review Letters 100

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Confinement degradation and transport of energetic ions due to Alfve'n eigenmodes in JT-60U weak shear plasmas2007

    • Author(s)
      M. Ishikawa, M. Takechi, K. Shinohara, C. Z. Cheng, G. Matsunaga, et. al.
    • Journal Title

      Nuclear Fusion 47

      Pages: 849-855

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Particle simulation of bursting Alfve'n modes in JT-60U2007

    • Author(s)
      S. Briguglio, G. Fogaccia, G. Vlad, F. Zonca, , K. Shinohara, M. Ishikawa, M. Takechi
    • Journal Title

      Physics of Plasmas 14

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] トカマクにおけるアルウェン固有モードと高速イオンの相互作用2007

    • Author(s)
      篠原孝司, 武智学, 石川正男
    • Journal Title

      Journal of Plasma and Fusion Research 83

      Pages: 873-882

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fast data acquisition system based on digital oscilloscopes for fluctuation measur ements in a long pulse JT-60U tokamak plasma2007

    • Author(s)
      G. Matsunaga, M. Takechi amd K. Toi
    • Journal Title

      Fusion Engineering and Design 82

      Pages: 207-213

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] ヘリカルプラズマにおけるアルヴェン固有モードと高速粒子との相互作用2007

    • Author(s)
      東井和夫, 長壁正樹, 磯部光孝
    • Journal Title

      Journal of Plasma and Fusion Research 83

      Pages: 883-899

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Summary of the 9th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems (Takayama, Japan, 9-11 November 2005)2006

    • Author(s)
      K.Toi
    • Journal Title

      Nuclear Fusion 46・10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Studies of fast-ion transport induced by energetic particle modes using fast-particle diagnostics with high time resolution in CHS2006

    • Author(s)
      M.Isobe, K.Toi, H.Matsushita, K.Goto, C.Suzuki et al.
    • Journal Title

      Nuclear Fusion 46・10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Experimental observations of enhanced radial transport of energetic particles with Alfven eigenmode on the LHD2006

    • Author(s)
      M.Osakabe, S.Yamamoto, K.Toi, Y.Takeiri, S.Sakakibara et al.
    • Journal Title

      Nuclear Fusion 46・10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Observation of confinement degradation of energetic ions due to Alfven eigenmodes in JT-60U weak shear plasmas2006

    • Author(s)
      M.Ishikwa, M.Takechi, K.Shinohara, Y.Kusama, G.Matsunaga et al.
    • Journal Title

      Nuclear Fusion 46・10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Fast data acquisition system based on digital oscilloscopes for fluctuation measurements in a long pulse JT-60U tokamak plasma2006

    • Author(s)
      G.Matsunagaa, M.Takechi, K.Toi
    • Journal Title

      Fusion Engineering and Design 82・2

      Pages: 207-213

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Density Fluctuation Measurement Using Motional Stark Effect Optics in JT-60U2006

    • Author(s)
      T.Suzuki, T.Fujita, N.Oyama, A.Isayama, G.Matsunaga, T.Oikawa, N.Asakura, M.Takechi
    • Journal Title

      Rev. Sci. Instrum. 77.10

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Experimental studies of energetic-ion-driven MHD instabilities in Large helical Device plasmas2005

    • Author(s)
      S.Yamamoto et al.
    • Journal Title

      Nuclear Fusion 45・5

      Pages: 326-336

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Excitation of toroidicity-induced Alfven eigenmodes by the electrodes inserted in a heliotron/torsatron plasma2005

    • Author(s)
      G.Matsunaga et al.
    • Journal Title

      Physical Review Letters 94・22

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Experimental Studies of Energetic-Ion-Driven MHD Instabilities in the Large Helical Device Plasmas2005

    • Author(s)
      S.Yamamoto, K.Toi, S.Ohdachi, N.Nakajima, S.Sakakibara, C.Nuhrenberg et al.
    • Journal Title

      Nuclear Fusion Vol.45(to be published)

    • Related Report
      2004 Annual Research Report
  • [Presentation] Excitation of Stable Alfven Eigenmodes by Application of Alternating Magnetic Field Perturbations in the Compact Helical System2007

    • Author(s)
      T. Ito, K. Toi, G. Matsunaga, M. Isobe, K. Nagaoka
    • Organizer
      17th International Toki Conference(ITC17)on Ph ysics of Flows and Turbulence in Plasmas
    • Place of Presentation
      セラトピア土岐(日本)
    • Year and Date
      2007-10-18
    • Related Report
      2007 Annual Research Report
  • [Presentation] Local Observations of Fast Ion Responses to Energetic Particle Modes Using a Directional Probe in the Compact Helical Systems(CHS)(Invited talk)2007

    • Author(s)
      K. Nagaoka, M. Isobe, K. Toi, K. Goto, T. Ito, et. al.
    • Organizer
      10th IAEA Technical Meeting on Energetic Particl es in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-10
    • Related Report
      2007 Annual Research Report
  • [Presentation] MHD instabilities excited by supra-thermal electrons in low density ECRH plasmas of Compact Helical System(CHS)(Oral presentation)2007

    • Author(s)
      M. Isobe, K. Tbi, Y. Yoshimura, K. Nagaoka, A. Shimizu, et. al.
    • Organizer
      10th IAEA Technical Meeting on Energetic Particl es in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-10
    • Related Report
      2007 Annual Research Report
  • [Presentation] Measurement of Radial Structure of Alfven Eigenmodes with Fast Response Hα-Detector Array in the Large Helical Device(Oral presentation)2007

    • Author(s)
      K. Ogawa, K. Toi, F. Watanabe, M. Isobe, C. Suzuki, et. al.
    • Organizer
      10th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] Damping Mechanism of Alfven Eigenmode on CHS and Its Sensing System on JT-60U2007

    • Author(s)
      G. Matsunaga, K. Toi, M. Takechi, K. Shinohara, A. Fukuyama
    • Organizer
      10th IAEA Technical Meeting on Energetic Particl es in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] Energy shift of the resonant particles being associated frequency shift of TAE-mode on LHD2007

    • Author(s)
      M. Osakabe, S. Yamamoto, K. Toi, Y. Takeiri, K. Nagaoka, et. al.
    • Organizer
      10th IAEA Tbchnical Meeting on Energetic Particl es in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-09
    • Related Report
      2007 Annual Research Report
  • [Presentation] Observation of Alfven Eigenmodes with Frequency Sweeping in a Large Helical Device Plasma with Large Counter Beam-Driven Current(Invited talk)2007

    • Author(s)
      K. Toi, F. Watanabe, T. Tokuzawa, K. Ida, S. Yamamoto, et. al.
    • Organizer
      10th IAEA Technical Meeting on Energetic Particl es in Magnetic Confinement Systems
    • Place of Presentation
      クロスター・ゼーオン(ドイツ)
    • Year and Date
      2007-10-08
    • Related Report
      2007 Annual Research Report

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Published: 2004-04-01   Modified: 2018-03-28  

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