乱流プラズマの構造相図の作成

2008 Fiscal Year Annual Research Report

• Project/Area Number: 20560767
• Research Institution: Kyushu University
• Principal Investigator: 稲垣 滋 Kyushu University, 応用力学研究所, 准教授 (60300729)
• Keywords: 乱流 / プラズマ核融合 / 自己組織化 / 相図 / 基礎実験 / 遷移現象

Research Abstract

本研究課題では、プラズマ乱流の形成する構造を非平衡系における相と考え、外部制御パラメータによってプラズマ乱流はどのような相を持つのかを明らかにすることを目的とする。
“相"とは、平衡系において定義されている概念であり、“不均一性"が存在する非平衡系では定義できない。しかし、遠非平衡系であるトロイダルプラズマについては、L-mode,H-modeと呼ばれる質的に異なる構造が存在し、プラズマは相転移のようにその二つの状態間を遷移する事が知られている。また、異なる構造間では乱流の状態も質的に異なる(L-modeでは乱流が強く,H-modeでは乱流が抑制されている)ため、不均一性を乱流の状態という形で繰り込む事で相図は非平衡系へと拡張可能である。
平成20年度では、プラズマ乱流状態を外部から制御する実験として、直線磁場装置を用いて、3kW以下での加熱入力制御、300-1200Gaussの磁場制御、入射中性ガス量及びガス排気速度の調整による1-6mTorrまでの中性粒子密度制御を行った。中性粒子制御に関しては、中性粒子分布をモンテカルロコードによってシミュレーションし、計測と比較する事で中性粒子制御の有効性を確認した。乱流解析では多チャンネルラングミュアプローブアレイ計測に対して、従来のフーリエスペクトル解析によるモード解析、そしてストリーマーの解析の適用を進めた。
相図作成としては、イオン反磁性方向に伝搬する周方向モード数m=1の構造の強度に着目して整理を行った。本年度で特筆すべき成果は、乱流スペクトル構造の自発遷移の観測である。遷移現象は一般に相の界面近傍で観測されるものであり、今回の乱流スペクトルの遷移の観測は、プラズマ乱流構造を相図としてまとめる事が可能である事を強く支持する。

Research Products

• [Journal Article] Reynolds stress probe measurements for investigation of nonlinear processes of turbulence in the large mirror device and in the large mirror device-upgrade (2009)
  • Author(s): Y. Nagashima, S. -I. Itoh, K. Itoh, A. Fujisawa, S. Inagaki, Y. Kawai, S. Shinohara, M. Fukao, T. Yamada, K. Terasaka, T. Maruta, K. Kamataki, H. Arakawa, M. Yagi, N. Kasuya, G. R. Tynan, P. H. Diamond, Y. Takase
  • Journal Title: J. Plasma Fusion Res. Series (in press)
  • Peer Reviewed
• [Journal Article] Measurement of Nonlinear Mode Coupling in the Large Mirror Device-Upgrade (2009)
  • Author(s): T. Yamada, S. -I. Itoh, S. Inagaki, Y. Nagashima, S. Shinohara, T. Maruta, K. Terasaka, K. Kmaataki, N. Kasuya, M. Yagi, Y. Kawai, A. Fujisawa, K. Itoh
  • Journal Title: J. Plasma Fusion Res. Series (in press)
  • Peer Reviewed
• [Journal Article] Dynamics of Drift and Flute Modes in Linear Cylindrical ECR Plasma (2009)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Journal Title: J. Plasma Fusion Res. Series (in press)
  • Peer Reviewed
• [Journal Article] Spatiotemporal Behavior of Drift Waves in LMD-U (2008)
  • Author(s): T. Yamada, S. -I. Itoh, K. Terasaka, N. Kasuya, Y. Nagashima, S. Shinohara, T. Maruta, M. Yagi, S. Inagaki, Y. Kawai, A. Fujisawa, K. Itoh
  • Journal Title: Plasma Fusion Res. 3 Pages: S1021-(1-4)
  • Peer Reviewed
• [Journal Article] Transport Dynamics and Multi-Scale Coupling of Turbulence in LHD (2008)
  • Author(s): S. Inagaki, N. Tamura, Y. Nagashima, T. Tokuzawa, T. Yamada, K. Ida, T. Maruta, S. Kubo, K. Terasaka, T. Shimozuma, Y. Nagayama, K. Kawahata, A. Komori, S. Shinohara, A. Fujisawa, M. Yagi, Y. Kawai, S. -I. Itoh, K. Itoh, the LHD experimental group
  • Journal Title: Plasma Fusion Res. 3 Pages: S1006-(1-7)
  • Peer Reviewed
• [Journal Article] Experimental Study of Drift Wave Turbulence on Linear Plasma (2008)
  • Author(s): T. Yamada, S. -I. Itoh, T. Maruta, N. Kasuya, S. Shinohara, Y. Nagashima, M. Yagi, K. Terasaka, S. Inagaki, Y. Kawai, M. Fukao, A. Fujisawa, K. Itoh
  • Journal Title: Plasma Fusion Res. 3 Pages: 044-(1-5)
  • Peer Reviewed
• [Journal Article] Observation of Zonal Flow Type Oscillation in Linear Cylindrical ECR Plasmas (2008)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Journal Title: Plasma Fusion Res. 3 Pages: 047-(1-5)
  • Peer Reviewed
• [Journal Article] Nonlinear energy transfer of drift-wave fluctuation in a cylindrical laboratory plasma (2008)
  • Author(s): Y. Nagashima, S. -I. Itoh, S. Shinohara, M. Fukao, A. Fujisawa, K. Terasaka, Y. Kawai, N. Kasuya, M. Yagi, S. Inagaki, T. Yamada, K. Itoh
  • Journal Title: Plasma Fusion Res. 3 Pages: 056-(1-3)
  • Peer Reviewed
• [Presentation] Observation of zonal flow type oscillation in linear cylindrical ECR plasma (2009)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Organizer: 64th Annual Meeting of the Physical Society of Japan
  • Place of Presentation: Rikkyo Univ. (Ikebukuro Campus), Tokyo, Japan
  • Year and Date: 20090327-20090330
• [Presentation] Observation of transition dynamics in turbulence spectrum on LMD-U (2009)
  • Author(s): H.Arakawa, K.Kamataki, S.Inagaki, 他12名
  • Organizer: 64th Annual Meeting of the Physical Society of Japan
  • Place of Presentation: Rikkyo Univ. (Ikebukuro Campus), Tokyo, Japan
  • Year and Date: 2009-03-28
• [Presentation] Zonal flow type oscillation in linear ECR plasma (2008)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Organizer: 12th Assembly of Kyushu-Okinawa-Yamaguchi Branch, Japan Society of Plasma Science and Fusion Research
  • Place of Presentation: Kyushu Univ., Fukuoka, Japan
  • Year and Date: 20081222-20081223
• [Presentation] Radial Interaction in Dynamic Heat Transport of LHD Plasmas (2008)
  • Author(s): S. Inagaki, N. Tamura, T. Tokuzawa, K. Ida, T. Shimozuma, S. Kubo, Y. Nagayama, K. Kawahata, S. Sudo, A. Komori, K. Itoh, S. -I. Itoh, LHD Experimental Group
  • Organizer: 22nd IAEA Fusion Energy Conference - 50th Anniversary of Controlled Nuclear Fusion Research
  • Place of Presentation: Geneva, Switzerland
  • Year and Date: 20081012-20081018
• [Presentation] Reynolds stress probe measurements for investigation of nonlinear processes of turbulence in the large mirror device and in the large mirror device-upgrade (selected for oral presentation) (2008)
  • Author(s): Y. Nagashima, S. -I. Itoh, K. Itoh, A. Fujisawa, S. Inagaki, Y. Kawai, S. Shinohara, M. Fukao, T. Yamada, K. Terasaka, T. Maruta, K. Kamataki, H. Arakawa, M. Yagi, N. Kasuya, G. R. Tynan, P. H. Diamond, Y. Takase
  • Organizer: 14th International Congress on Plasma Physics (ICPP2008)
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 20080908-20080912
• [Presentation] Radial structure of competitive phenomena of drift and flute modes in linearcylindrical ECR plasma (2008)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Organizer: 14th International Congress on Plasma Physics (ICPP2008)
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 20080908-20080912
• [Presentation] Measurement of drift wave turbulence in the Large Mirror Device-Upgrade (2008)
  • Author(s): T. Yamada, S. -I. Itoh, S. Inagaki, Y. Nagashima, S. Shinohara, T. Maruta, K. Terasaka, K. Kamataki, N. Kasuya, M. Yagi, Y. Kawai, A. Fujisawa, K. Itoh
  • Organizer: 14th International Congress on Plasma Physics (ICPP2008)
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 20080908-20080912
• [Presentation] Density and potential fluctuation structures in LMD-U (2008)
  • Author(s): S. Inagaki, T. Yamada, Y. Nagashima, K. Kamataki, N. Kasuya, S. Shinohara, K. Terasaka, M. Yagi, A. Fujisawa, K. Itoh, S. -I. Itoh
  • Organizer: 14th International Congress on Plasma Physics (ICPP2008)
  • Place of Presentation: Fukuoka, Japan
  • Year and Date: 20080908-20080912
• [Presentation] Measurement of Plasma turbulence structures with a two-dimensional movable probe in LMD-U (2008)
  • Author(s): H. Arakawa, K. Kamataki, S. Inagaki, T. Maruta, Y. Nagashima, T. Yamada, S. Shinohara, K. Terasaka, S. Sugita, M. Yagi, K. Kasuya, A. Fujisawa, K. Itoh, S. -I. Itoh
  • Organizer: 2nd ITER International Summer School in conjunction with the 47th Summer School of JSPF for Young Plasma Scientists “Confinement (from device to plasma)"
  • Place of Presentation: Kyushu Univ., Fukuoka, Japan
  • Year and Date: 20080722-20080725
• [Presentation] Investigation of Competitive Behavior between Drift Instability and Flute Instability in Linear Cylindrical ECR Plasma (2008)
  • Author(s): K. Kamataki, S. -I. Itoh, Y. Nagashima, S. Inagaki, S. Shinohara, M. Yagi, T. Yamada, Y. Kawai, A. Fujisawa, K. Itoh
  • Organizer: 2nd ITER International Summer School in conjunction with the 47th Summer School of JSPF for Young Plasma Scientists “Confinement (from device to plasma)"
  • Place of Presentation: Kyushu Univ., Fukuoka, Japan
  • Year and Date: 20080722-20080725
• [Presentation] Observation of transition phenomena of spectra of density fluctuation in LMD-U (2008)
  • Author(s): H.Arakawa, K.Kamataki, S.Inagaki, T, 他11名
  • Organizer: 12th Assembly of Kyushu-Okinawa-Yamaguchi Branch, Japan Society of Plasma Science and Fusion Research
  • Place of Presentation: Kyushu Univ., Fukuoka, Japan
  • Year and Date: 2008-12-22
• [Presentation] Analysis of neutral particle in linear turbulent plasma device LMD-U (2008)
  • Author(s): Y.Sawanaga, S.Inagaki, 他4名
  • Organizer: 12th Assembly of Kyushu-Okinawa-Yamaguchi Branch, Japan Society of Plasma Science and Fusion Research
  • Place of Presentation: Kyushu Univ., Fukuoka, Japan
  • Year and Date: 2008-12-22
• [Presentation] Analysis of neutral particle in linear turbulent plasma device LMD-U (2008)
  • Author(s): Y.Sawanaga, S.Inagaki, 他4名
  • Organizer: 25th Annual Meeting of the Japan Society of Plasma Science and Nuclear Fusion Research
  • Place of Presentation: Utsunomiya, Japan
  • Year and Date: 2008-12-03
• [Presentation] Observation of turbulence transitions in Ar plasmas on LMD-U (2008)
  • Author(s): H.Arakawa, K.Kamataki, S.Inagaki, 他11名
  • Organizer: 2008 Autumn Meeting of the Physical Society of Japan
  • Place of Presentation: Iwate Univ., Iwate, Japan
  • Year and Date: 2008-09-22
• [Presentation] Two-Dimensional Spatial Structure of Plasma Turbulence in LMD-U (2008)
  • Author(s): S.Inagaki, 他13名
  • Organizer: 35th European Physical Society Conference on Plasma Physics
  • Place of Presentation: Crete Greece
  • Year and Date: 2008-06-12
• [Book] 2^<nd> ITER INTERNATIONAL SUMMER SCHOOL in conjunction with the 47^<th> Summer School of JSPF for Young Plasma Scientists : CONFINEMENT (2009)
  • Author(s): S. -I. Itoh, M. Shindo, S. Inagaki, M. Yagi
  • Total Pages: 243
  • Publisher: American Institute of Physics Conference Proceedings