Effects of energetic-ion-driven MHD instabilities in a reversed magnetic shear plasma on energetic ion transport

• Project/Area Number: 21360457
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: TOI Kazuo 核融合科学研究所, ヘリカル研究部, 教授 (20093057)
• Co-Investigator(Kenkyū-buntansha): OSAKABE Masaki 核融合科学研究所, ヘリカル研究部, 准教授 (90280601) ; ISOBE Mitsutaka 核融合科学研究所, ヘリカル研究部, 准教授 (00300731)
• Co-Investigator(Renkei-kenkyūsha): OHDACHI Satoshi 核融合科学研究所, ヘリカル研究部, 准教授 (00270489) ; IDO Takeshi 核融合科学研究所, ヘリカル研究部, 准教授 (50332185) ; TOKUZAWA Tokihiko 核融合科学研究所, ヘリカル研究部, 准教授 (90311208) ; SHIMIZU Akihiro 核融合科学研究所, ヘリカル研究部, 助教 (00390633) ; OZAKI Tetsu 核融合科学研究所, ヘリカル研究部, 准教授 (50183033) ; TODO Yasushi 核融合科学研究所, シミュレーション科学研究部, 教授 (00249971) ; MATSUNAGA Go 日本原子力研究開発機構, 核融合研究開発部門, 研究員 (10391260)
• Project Period (FY): 2009 – 2011
• Project Status: Completed(Fiscal Year 2011)
• Budget Amount: ¥10,010,000 (Direct Cost : ¥7,700,000、Indirect Cost : ¥2,310,000); Fiscal Year 2011 : ¥1,300,000 (Direct Cost : ¥1,000,000、Indirect Cost : ¥300,000); Fiscal Year 2010 : ¥1,950,000 (Direct Cost : ¥1,500,000、Indirect Cost : ¥450,000); Fiscal Year 2009 : ¥6,760,000 (Direct Cost : ¥5,200,000、Indirect Cost : ¥1,560,000)
• Keywords: アルファ粒子 / アルヴェン固有モード / 反転磁気シア / 高周波帯状流 / 高速イオン輸送 / 測地線音響モード

Research Abstract

A reversed magnetic shear(RS)-plasma where the shear is positive in plasma central region and negative in the edge region, different from the tokamak RS-plasma was produced in the Large Helical Device(LHD). In such plasma, reversed magnetic shear Alfven eigenmode(RSAE) and geodesic acoustic mode(GAM) were concurrently excited by energetic ions. Characteristics of observed RSAE and GAM, nonlinear coupling of these instabilities, and their impacts on confinement of energetic ions and background bulk plasma were compared with those in tokamaks. The comparison study is important for systematic and comprehensive understanding of these instabilities.

Research Products

• [Journal Article] Beam Ion Losses Caused by Magnetic Field Ripples in Various Plasma Parameter Ranges in the Large Helical Device (2012)
  • Author(s): K.Ogawa
  • Journal Title: Plasma and Fusion Research Volume : 7
  • DOI: 10.1585/pfr.7.2402014
  • Peer Reviewed
• [Journal Article] Magnetic Configuration Effects on Fast Ion Losses Induced by Fast Ion Driven Toroidal Alfven Eigenmodes in the Large Helical Device (2012)
  • Author(s): K. Ogawa, M. Isobe(磯部光孝), K. Toi(東井和夫), et al.
  • Journal Title: Plasma Science and Technology Volume : Vol.14 Pages : 269-272
  • DOI: 10.1088/1009-0630/14/4/01
  • Peer Reviewed
• [Journal Article] Experimental Check of Deceleration of Neutral Beam-Injected Energetic Ions in the HL-2A Tokamak (2011)
  • Author(s): M.Isobe, et al.
  • Journal Title: Plasma and Fusion Research Volume : 6
  • DOI: 10.1088/0741-3335/53/2/024008
  • Peer Reviewed
• [Journal Article] Energetic-ion-driven global instabilities in stellarator/helical plasmas and comparison with tokamak plasmas (2011)
  • Author(s): K.Toi(東井和夫), K.Ogawa(小川国大), M.Isobe(磯部光孝), M.Osakabe(長壁正樹), D.A.Spong(ORNL), Y.Todo
  • Journal Title: Plasma Physics and Controlled Fusion Volume : 53
  • Peer Reviewed
• [Journal Article] Observationof energetic-ion losses induced by various MHD instabilities in the Large Helical Device(LHD) (2010)
  • Author(s): K. Ogawa, M. Isobe(磯部光孝), K. Toi(東井和夫), D. A. Spong, A. Shimizu, M. Osakabe(長壁正樹), et al.
  • Journal Title: Nuclear Fusion Volume : Vol.50
  • DOI: 10.1088/0029-5515/50/8/084005
  • Peer Reviewed
• [Journal Article] Observation of Reversed-Shear Alfv?n Eigenmodes Excited by Energetic Ions in a Helical Plasma (2010)
  • Journal Title: PHYSICAL REVIEW LETTERS Volume : 105 Issue : 14 Pages : 145003-1 - 145003-4
  • Publisher: AMER PHYSICAL SOC
  • DOI: 10.1103/physrevlett.105.145003
  • Peer Reviewed
• [Journal Article] Observation of energetic-ion losses induced by various MHD instabilities in the Large Helical Device (LHD) (2010)
  • Author(s): K.Ogawa(小川国大), M.Isobe(磯部光孝), K.Toi(東井和夫), D.A.Spong, A.Sghimizu, M.Osakabe(長壁正樹), et al.
  • Journal Title: Nuclear Fusion Volume : 50
  • Peer Reviewed
• [Journal Article] Observation of Reversed-Shear Alfven Eigenmodes Excited by Energetic Ions in a Helical Plasma (2010)
  • Author(s): K.Toi(東井和夫), F.Watanabe, T.Tokuzawa, K.Ida, S.Morita, T.Ido, A.Shimizu, M Isobe(磯部光孝), M.Osakabe(長壁正樹), et al.
  • Journal Title: Physical Review Letters Volume : 105
  • Peer Reviewed
• [Presentation] LHDプラズマにおける高速イオン励起GAMによる大振幅電位揺動とイオン温度上昇 (2012)
  • Author(s): 東井和夫、中村充希、井戸毅、清水昭博, 他
  • Organizer: 第67回日本物理学会年次大会、関西学院大学、西宮
  • Place of Presentation: 関西学院大学(口頭発表)
  • Year and Date: 2012-03-24
• [Presentation] Studies of Interaction between Energetic Particles and MHD Modes on LHD (2012)
  • Author(s): K.Toi
  • Organizer: 2012 US-Japan MHD workshop "Effect of 3D Magnetic Field on MHD Equilibrium and Stability : Totowa optimum control of toroidal plasmas" and ITPA Topical Group Meeting on Energetic Particles, 5-9 Mar., 2012, Toki, Japan
  • Place of Presentation: 核融合科学研究所(Invited)
  • Year and Date: 2012-03-05
• [Presentation] Observation of MHD Instabilities in an Acoustic Range of Frequency in LHD ECRH Plasmas with Suprathermal Electrons (2011)
  • Author(s): M. Isobe(磯部光孝)
  • Organizer: 12^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: オースチン(米国)
  • Year and Date: 2011-09-09
• [Presentation] Magnetic Configuration Effects on TAE Induced Losses and Comparison with Orbit Following Model in LHD (2011)
  • Author(s): K.Ogawa, M.Isobe, K.Toi, D.A.Spong, M.Osakabe
  • Organizer: 12^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems, 7-10 Sep., Austin, USA
  • Place of Presentation: オムニホテル:オースチン・ダウンタウンホテル(Invited)
  • Year and Date: 2011-09-09
• [Presentation] Chracteristics of Energetic-Ion-Driven Geodesic Acoustic Modes in the Large Helical Device(LHD) (2011)
  • Author(s): K. Toi(東井和夫)
  • Organizer: 12^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: オースチン(米国)
  • Year and Date: 2011-09-07
• [Presentation] Effect of energetic-particle induced n=0 instabilities to bulk-ions on LHD (2011)
  • Author(s): M. Osakabe(長壁正樹)
  • Organizer: 12^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: オースチン(米国)
  • Year and Date: 2011-09-07
• [Presentation] Characteristics of Energetic-Ion-Driven Geodesic Acoustic Modes in the Large Helical Device (LHD) (2011)
  • Author(s): K.Toi, K.Ogawa, M.Isobe, M.Osakabe, et al
  • Organizer: 12^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems, 7-10 Sep., Austin, USA
  • Place of Presentation: オムニホテル:オースチン・ダウンタウンホテル(Oral)
  • Year and Date: 2011-09-07
• [Presentation] Energetic-particle-driven global instabilities in helical plasmas and comparison with tokamak plasmas (2011)
  • Author(s): K.Toi
  • Organizer: 5^<th> ITER International Summer School, 20-24 June, 2011, University Paul Cezanne campus in Aix en Provence, France
  • Place of Presentation: プロヴァンス大学ポールセザンヌ校(フランス)(Invited)
  • Year and Date: 2011-06-24
• [Presentation] Role of Low-Order Rational Surfaces in Transport Barrier Formation on the Large Helical Device (2010)
  • Author(s): K. Toi(東井和夫)
  • Organizer: 23th IAEA Fusion Energy Conference
  • Place of Presentation: Daejeon(韓国)
• [Presentation] Role of Low-Order Rational Surfaces in Transport Barrier Formation on the Large Helical Device (2010)
  • Author(s): K.Toi(東井和夫), F.Watanabe, K.Tanaka, T.Tokuzawa, K.Ogawa, M.Isobe(磯辺光孝), M.Osakabe(長壁正樹), et al.
  • Organizer: 23th IAEA Fusion Energy Conference Daejeon Korea 11-16 Oct.2010;発表番号 PD/P-01
  • Place of Presentation: デジョン(韓国)
  • Year and Date: 2010-10-16
• [Presentation] Interplay between Energetic Particles and Alfven Eigenmodes in Toroidal Plasmas (2009)
  • Author(s): K. Toi(東井和夫)
  • Organizer: 17^<th> International Stellarator/Heliotron Workshop
  • Place of Presentation: プリンストン(米国)
  • Year and Date: 2009-10-16
• [Presentation] Energetic-particle modes driven by suprathermal electrons produced by off-axis second harmonic ECRH in Compact Helical System(CHS) (2009)
  • Author(s): M. Isobe(磯部光孝)
  • Organizer: 11^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: キエフ(ウクライナ)
  • Year and Date: 2009-09-23
• [Presentation] Reversed Shear Alfven Eigenmodes and Geodesic Acoustic Mode in Reversed Magnetic Shear Configuration with Negative Concavity on the Large Helical Device (2009)
  • Author(s): K. Toi(東井和夫)
  • Organizer: 11^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: キエフ(ウクライナ)
  • Year and Date: 2009-09-22
• [Presentation] Measurement of Fast-Ion losses Induced by Toroidal Alfven Eigenmodes in the Large Helical Device (2009)
  • Author(s): K.Ogawa(小川国大)
  • Organizer: 11^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: キエフ(ウクライナ)
  • Year and Date: 2009-09-22
• [Presentation] Clump and Hole formation in the energetic particle spectra by the toroidicity induced Alfven Eigenmodes and their behaviors during the mode activieites (2009)
  • Author(s): M. Osakabe(長壁正樹)
  • Organizer: 11^<th> IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems
  • Place of Presentation: キエフ(ウクライナ)
  • Year and Date: 2009-09-21