Heating and flow drive by low frequency waves in high beta plasmas

2013 Fiscal Year Final Research Report

• Project/Area Number: 22686085
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Nuclear fusion studies
• Research Institution: The University of Tokyo
• Principal Investigator: INOMOTO Michiaki 東京大学, 新領域創成科学研究科, 准教授 (00324799)
• Research Collaborator: KAMIO Shuji 自然科学研究機構, 核融合科学研究所, 助教 (80795525) ; II Toru 東京大学, 工学系研究科, 博士後期課程 ; KUWAHATA Akihiro 東京大学, 工学系研究科, 博士後期課程 ; ITAGAKI Hirotomo 東京大学, 新領域創成科学研究科, 博士後期課程 ; WATANABE Takenori 東京大学, 新領域創成科学研究科, 博士後期課程 ; YAMASAKI Kotaro 東京大学, 工学系研究科, 博士後期課程
• Project Period (FY): 2010-04-01 – 2014-03-31
• Keywords: プラズマ・核融合 / プラズマ加熱 / 高ベータプラズマ

Research Abstract

Low frequency waves are excited in the high beta region of magnetically confined plasmas by magnetic reconnection during plasma merging process. These waves partly contribute to the conversion from magnetic energy to ion thermal energy. When the reconnection includes significant guide magnetic field perpendicular to the reconnection magnetic field, monotonic large-amplitude waves are excited as kinetic Alven waves. However, these waves are not dominant factors providing the observed ion heating. On the other hand, when there is no guide field, very low fewquency waves are globally excited. These shear Alfven waves directly drive ion flows and eventually provide conversion from magnetic to ion thermal energy. It is concluded that these very low frequency waves work for the heating method for high beta plasmas.

Research Products

• [Journal Article] プラズマ合体時の磁気リコネクションにおける軟X 線放射の観測 (2014)
  • Author(s): 牛木知彦, 井通暁, 小口治久
  • Journal Title: 電気学会論文誌A Volume: Vol.134, No.9(掲載予定)
  • Peer Reviewed
• [Journal Article] スライド型2 次元トムソン散乱計測を用いた球状トカマク合体時の電子加熱の定量的評価 (2014)
  • Author(s): 郭学瀚, 井通暁, 小野靖
  • Journal Title: 電気学会論文誌A Volume: Vol.134, No.9(掲載予定)
  • Peer Reviewed
• [Journal Article] Mitigation of rotational instability of high-beta field-recersed configuration by double-sided magnetized plasmoid injection (2014)
  • Author(s): H. Itagaki, T. Asai, M. Inomoto, Ts. Takahashi
  • Journal Title: Phys. Plasmas Volume: 21 Pages: 030703
  • DOI: 10.1063/1.4868434
  • Peer Reviewed
• [Journal Article] Plasmoid-Induced Pull Reconnection Experiments in University of Tokyo Spherical Tokamak (2013)
  • Author(s): T.G Watanabe, Y. Ono, T. Yamada, S. Kamio, Q.H. Cao, H. Itagaki, K. Takemura, K. Yamasaki, K. Ishiguchi, M. Inomoto
  • Journal Title: Plasma and Fusion Res Volume: 8 Pages: 2401148
  • DOI: 10.1585/pfr.8.2401148
  • Peer Reviewed
• [Journal Article] Development of a Quasi-steady Equilibrium Field System for Plasma Merging ST Startup Experiments on the UTST Device (2013)
  • Author(s): H. Itagaki, M. Inomoto, S. Kamio, Q.H. Cao, K. Takemura, K. Yamasaki, T.G. Watanabe, T. Yamada
  • Journal Title: Plasma and Fusion Res Volume: 8 Pages: 1402139
  • DOI: 10.1585/pfr.8.1402139
  • Peer Reviewed
• [Journal Article] Initiation of Impulsively Fast Magnetic Reconnection Induced by Current Sheet Ejection (2013)
  • Author(s): M. Inomoto, S. Kamio, A. Kuwahata, T.G. Watanabe, K. Yamasaki, K. Kadowaki, T. Ito, Y. Kaminou, T. Yamada, Y. Ono
  • Journal Title: Plasma and Fusion Res Volume: 8 Pages: 2401112
  • DOI: 10.1585/pfr.8.2401112
  • Peer Reviewed
• [Journal Article] Experimental Study of Two-fluid Effect during Magnetic Reconnection in the UTST Merging Experiment (2013)
  • Author(s): K. Yamasaki, S. Kamio, K. Takemura, Q.H. Qao, T.G. Watanabe, H. Itagaki, T. Yamada, M. Inomoto, Y. Ono
  • Journal Title: Plasma and Fusion Res Volume: 8 Pages: 2401130
  • DOI: 10.1585/pfr.8.2401130
  • Peer Reviewed
• [Journal Article] Excitation and propagation of electromagnetic fluctuations with ioncyclotron range of frequency in magnetic reconnection laboratory experiment (2013)
  • Author(s): M. Inomoto, A. Kuwahata, H. Tanabe, Y. Ono
  • Journal Title: Phys. Plasmas Volume: 20 Pages: 061209
  • DOI: 10.1063/1.4811469
  • Peer Reviewed
• [Journal Article] Stability and confinement improvement of a oblate field-reversed configuration by using neutral beam injection (2013)
  • Author(s): T. Ii, M. Inomoto, K. Gi, T. Umezawa, T. Ito, K. Kadowaki, Y. Kaminou, Y. Ono
  • Journal Title: Nucl. Fusion Volume: 53 Pages: 073002
  • DOI: 10.1088/0029-5515/53/7/073002
  • Peer Reviewed
• [Journal Article] Electron Acceleration by Magnetic Reconnection During Spherical Tokamak Merging Experiment (2013)
  • Author(s): S. Kamio, K. Yamasaki, K. Takemura, Q.H. Cao, T. G. Watanabe, H. Itagaki, T. Tsutsui, K. Ishiguchi, R. Imazawa, T. Yamada, C.Z. Cheng, M. Inomoto, Y. Takase, Y. Ono
  • Journal Title: 電気学会論文誌A Volume: 133-A Pages: 166-172
  • DOI: 10.1541/ieejfms.133.166
  • Peer Reviewed
• [Journal Article] Development of Multi-channel Doppler Spectroscopic Measurement System Using 8x8 Mutlianode Photomultiplier Tube Assembly (2012)
  • Author(s): S. Kamio, N. Suzuki, Q.H. Cao, T.G. Watanabe, K. Abe, M. Sakumura, K. Ishiguchi, R. Imazawa, T. Yamada, M. Inomoto, Y. Ono
  • Journal Title: Review of Scientific Instruments Volume: 83 Pages: 083103
  • DOI: 10.1063/1.4739774
  • Peer Reviewed
• [Journal Article] 磁気リコネクションを介した異極性プラズマ合体実験における低周波磁場揺動の計測 (2012)
  • Author(s): 桑波田晃弘, 田辺博士, 伊藤慎悟, 井通暁, 小野靖
  • Journal Title: 電気学会論文誌A Volume: 132-A Pages: 233-238
  • DOI: 10.1541/ieejfms.132.233
  • Peer Reviewed
• [Journal Article] Magnetic Helicity Injection Mechanism for Double-Null Startup of the UTST Spherical Tokamak Plasmas (2011)
  • Author(s): T. G. Watanabe, Y. Ono, T. Yamada, S. Kamio, Q. Cao, N. Suzuki, K. Ishiguchi, M. Inomoto
  • Journal Title: Plasma and Fusion Res Volume: 6 Pages: 1202131
  • DOI: 10.1585/pfr.6.1202131
  • Peer Reviewed
• [Journal Article] Low Frequency Magnetic Fluctuations during Magnetic Reconnection in Laboratory Experiment (2011)
  • Author(s): A. Kuwahata, H. Tanabe, S. Ito, M. Inomoto, Y. Ono
  • Journal Title: Plasma and Fusion Res Volume: 6 Pages: 1201127
  • DOI: 10.1585/pfr.6.1201127
  • Peer Reviewed
• [Journal Article] Multipoint Spectroscopic Measurement of Spherical Tokamak Heating by Magnetic Reconnection in UTST (2011)
  • Author(s): S.Kamio, Q.H. Cao, K. Abe, M. Sakumura, N. Suzuki, T. Watanabe, K. Ishiguchi, R. Imazawa, T. Yamada, M. Inomoto, Y. Ono
  • Journal Title: Plasma and Fusion Res Volume: 6 Pages: 2402033
  • DOI: 10.1585/pfr.6.2402033
  • Peer Reviewed
• [Journal Article] Development of Effective Power Supply Using Electric Double Layer Capacitor for Static Magnetic Field Coils in Fusion Plasma Experiments (2011)
  • Author(s): M. Inomoto, K. Abe, T. Yamada, A. Kuwahata, S. Kamio, Q.H. Cao, M. Sakumura, N. Suzuki, T. Watanabe, Y. Ono
  • Journal Title: Review of Scientific Instruments Volume: 82 Pages: 023502
  • DOI: 10.1063/1.3553283
  • Peer Reviewed
• [Presentation] Overview of UTST/TS-4 experiments (2014)
  • Author(s): M. Inomoto, TS group
  • Organizer: The Second A3 Foresight Workshop on Spherical Torus (ST)
  • Place of Presentation: Tsinghua Univ. Beijing, China
  • Year and Date: 2014-01-06
• [Presentation] Laboratory Experiment of Magnetic Reconnection between Merging Flux Tubes with Strong Guide Field (2013)
  • Author(s): M. Inomoto, S. Kamio, A. Kuwahata, Y. Ono, TS group
  • Organizer: 2013 AGU Fall meeting
  • Place of Presentation: Moscone center, San Francisco, CA, USA
  • Year and Date: 2013-12-09
• [Presentation] Current profiles of high-beta compact toroids formed by plasma merging (2013)
  • Author(s): M. Inomoto, T. Ii, A. Kuwahata, T.G. Watanabe, K. Yamasaki, M. Annoura, Y. Kaminou, Y. Ono
  • Organizer: 2013 US-Japan Workshop on "Advanced controll and Confinement Improvement of Innovative Compact Toroidal Configurations"
  • Place of Presentation: 神戸国際会議場(兵庫県)
  • Year and Date: 2013-09-24
• [Presentation] 磁気リコネクション室内実験における非定常性と高速化 (2013)
  • Author(s): 井通暁, 神尾修治, 桑波田晃弘, 渡辺岳典, 伊藤大智, 門脇和丈, 竹村剛一良, 山崎広太郎, 山田琢磨, 小野靖
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学(広島県)
  • Year and Date: 2013-03-26
• [Presentation] Overview of UTST plasma merging experiment (2013)
  • Author(s): M. Inomoto, T. Yamada, S. Kamio, H. Itagaki, Q.H. Cao, T.G. Watanabe, K. Yamasaki, K. Takemura, A. Wang, Y. Takase, Y. Ono
  • Organizer: The First A3 Foresight Workshop on Spherical Torus (ST)
  • Place of Presentation: Seoul National Univ, Seoul, Korea
  • Year and Date: 2013-01-15
• [Presentation] Initiation of impulsively fast magnetic reconnection induced by current sheet ejection (2012)
  • Author(s): M. Inomoto, Y. Hayashi, H. Tanabe, T. Ii, A. Kuwahata, T. Ito, K. Kadowaki, Y. Kaminou, T. Yamada, Y. Ono
  • Organizer: 22nd International Toki Conference "Cross-Validation of Experiments and Modeling for Fusion and Astrophysical Plasmas"
  • Place of Presentation: セラトピア土岐(岐阜県)
  • Year and Date: 2012-11-19
• [Presentation] Generation of toroidal shear flow in oblate FRCs formed by counter-helicity plasma merging (2012)
  • Author(s): M. Inomoto, T. Ii, H. Oka, Y. Kaminou, H. Tanabe, A. Kuwahata, Y. Ono, and TS group
  • Organizer: CT2012 - Advanced Controls and Diagnostics for Confinement Improvement of Compact Toroids
  • Place of Presentation: Newport Beach, CA, USA
  • Year and Date: 2012-09-25
• [Presentation] 磁気リコネクション室内実験における電流シート近傍の波動励起 (2012)
  • Author(s): 井通暁, 桑波田晃弘, 高博シン, 小野靖
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学(神奈川県)
  • Year and Date: 2012-09-19
• [Presentation] Fast magnetic reconnection with plasmoid / current sheet ejection events in laboratory experiment (2012)
  • Author(s): M. Inomoto, Y. Hayashi, Y. Ono
  • Organizer: 39th COSPAR Scientific Assembly
  • Place of Presentation: Mysore, India
  • Year and Date: 2012-07-18
• [Presentation] Laboratory experiment of magnetic reconnection in the presense of strong guide field (2012)
  • Author(s): M. Inomoto, S. Kamio, A. Kuwahata, T.G. Watanabe, K. Yamasaki, B. Gao, Y. Ono
  • Organizer: 12th International Workshop on Interrelationship between Plasma Experiments in the Laboratory and in Space(IPELS2013)
  • Place of Presentation: 白馬東急ホテル(長野県)
  • Year and Date: 2012-07-04
• [Presentation] Excitation of Large-amplitude magnetic Fluctuation in Plasma Merging Experiment (2012)
  • Author(s): M. Inomoto, A. Kuwahata, B. Gao, H. Tanabe, T. Ito, Y. Ono, and TS group
  • Organizer: US-Japan Workshop on Magnetic Reconnection MR2012
  • Place of Presentation: Princetion, NJ. USA
  • Year and Date: 2012-05-24
• [Presentation] 磁気リコネクション室内実験における電流シート近傍の磁場および静電揺動計測 (2012)
  • Author(s): 井通暁, 桑波田晃弘, 高博シン, 小野靖
  • Organizer: 日本物理学会第67回年次大会
  • Place of Presentation: 関西学院大学(兵庫県)
  • Year and Date: 2012-03-26
• [Presentation] 磁気リコネクション室内実験の進展 (2012)
  • Author(s): 井通暁, 小野靖, 林由記, 田辺博士, 桑波田晃弘, TS グループ
  • Organizer: 日本天文学会2012年春季大会
  • Place of Presentation: 龍谷大学(京都府)
  • Year and Date: 2012-03-22
• [Presentation] Excitation of Low Frequency Electromagnetic Waves in Magnetic Reconnection Laboratory Experiment (2011)
  • Author(s): M. Inomoto, A. Kuwahata, S. Ito, H. Tanabe, Y. Hayashi, P. Copinger, T. Ii, B. Gao, T. Ito, T. Yamada, Y. Ono
  • Organizer: Fifth Hinode Science Conference
  • Place of Presentation: Cambridge, Massachusetts, USA
  • Year and Date: 2011-10-13
• [Presentation] Wave and Plasmoid Mediated Reconnections in Laboratory Experiments (2011)
  • Author(s): M. Inomoto, Y. Hayashi, S. Ito, P. Copinger, S. Kamio, H. Tanabe, T. Ii, A. Kuwahata, Q.H. Cao, H. Itagaki, H. Sakamoto, A. Matsuda, S. Inoue, K. Gi, N. Suzuki, G. Watanabe, T. Yamada, Y. Ono
  • Organizer: 11th International Workshop on Interrelationship between Plasma Experiments in the Laboratory and in Space(IPELS)
  • Place of Presentation: Whistler, Canada
  • Year and Date: 2011-07-15
• [Presentation] Kinetic behaviors of energetic ions in oblate field-reversed configuration (2010)
  • Author(s): M.Inomoto, H. Imanaka, Y. Hayashi, S. Ito, Y. Ito, H. Nonaka, H. Tanabe, T. II, K. Suzuki, A. Kuwahata, T. Sakamoto, A. Matsuda, A. Azuma, Y. Nemoto, A. Ohsaki, T. Asai, Y. Ono
  • Organizer: 23rd IAEA Fusion Energy Conference
  • Place of Presentation: Daejon, Korea
  • Year and Date: 2010-10-15
• [Remarks] 小野靖・井通暁研究室ホームページ
  • URL: http://tanuki.t.u-tokyo.ac.jp