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Study of the non-linear behavior of interchange MHD instability and its effect on the helical plasma confinement

Research Project

Project/Area Number 25289342
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Nuclear fusion studies
Research InstitutionNational Institute for Fusion Science

Principal Investigator

WATANABE Kiyomasa  核融合科学研究所, ヘリカル研究部, 教授 (00249963)

Co-Investigator(Kenkyū-buntansha) 佐藤 雅彦  核融合科学研究所, ヘリカル研究部, 助教 (80455211)
徳沢 季彦  核融合科学研究所, ヘリカル研究部, 准教授 (90311208)
Co-Investigator(Renkei-kenkyūsha) SAKAKIBARA Satoru  核融合科学研究所, ヘリカル研究部, 教授 (90280594)
OHTACHI Satoshi  核融合科学研究所, ヘリカル研究部, 教授 (00270489)
SUZUKI Yashihiro  核融合科学研究所, ヘリカル研究部, 教授 (20397558)
TSUCHIYA Hayato  核融合科学研究所, ヘリカル研究部, 教授 (90509522)
TAKEMURA Yuki  核融合科学研究所, ヘリカル研究部, 教授 (60705606)
ITAGAKI Masafumi  北海道大学, 大学院工学研究院, 名誉教授 (30281786)
OKAMOTO Masaaki  石川工業高等専門学校, 電気工学科, 准教授 (60508290)
SHIBATA Yoshihide  岐阜工業高等専門学校, 電気情報工学科, 助教 (20633209)
Research Collaborator SOGA Ryouta  名古屋大学, 大学院工学研究科
TAKEHARA Keita  名古屋大学, 大学院工学研究科
Project Period (FY) 2013-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2014: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2013: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywords核融合炉心プラズマ / 環状磁場プラズマ / 電磁流体力学的不安定性 / ミリ波帯電磁波反射計測 / 電子密度揺動計測 / 交換型不安定性 / ヘリカルプラズマ / ミリ波反射計 / 非線形飽和 / 核融合プラズマ / MHD不安定性 / ヘリオトロン / 交換型不安定生性 / ミリ波干渉計 / ミリ波反射系計
Outline of Final Research Achievements

In order to investigate the effects of the interchange instability, which is expected to prevent the discharges with high pressure in helical type fusion reactor, on the plasma confinement, we install the reflect meter with micro-waves in the Large Helical Device (LHD), measure the fluctuation of the magnetic container and the plasma flow velocity on the container, and make the numerical simulation to make clear the driving mechanism of the instability. We find that the occurrence of collapse observed in LHD, which is a phenomenon that the plasma pressure is rapidly reduced, is strongly related with the instability with a magnetic island, which is not consistent with that of conventional interchange instability. We find interchange instability with the island structure, which has smaller growth rate than that of the conventional interchange instability, but the value is not so small comparing with the conventional one when the plasma resistivity is fairly large.

Report

(5 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • 2013 Annual Research Report
  • Research Products

    (26 results)

All 2017 2016 2015 2014 Other

All Int'l Joint Research (1 results) Journal Article (8 results) (of which Peer Reviewed: 7 results,  Acknowledgement Compliant: 4 results) Presentation (17 results) (of which Int'l Joint Research: 5 results,  Invited: 3 results)

  • [Int'l Joint Research] カルロス3世大学(スペイン)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Distorted magnetic island formation during slowing down to mode locking in helical plasmas2017

    • Author(s)
      T. Tokuzawa, Y. Takemura, K.Y. Watanabe, S. Sakakibara, Y. Narushima, H. Tsuchiya, Y. Nagayama, S. Inagaki, K. Ida, M. Yoshinuma, K. Tanaka, Y. Suzuki, I. Yamada, and the LHD Experiment Group
    • Journal Title

      Nuclear Fusion

      Volume: 57 Issue: 7 Pages: 076003-076003

    • DOI

      10.1088/1741-4326/aa6d26

    • NAID

      120007029203

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Experimental Study on Slowing-down Mechanism of Locked Mode-like Instability in LHD2017

    • Author(s)
      Y. Takemura, K.Y. Watanabe, T. Tokuzawa, S. Sakakibara, Y. Narushima, M. Okamoto, S. Ohdachi, Y. Suzuki, K. Ida, M. Yoshinuma, H. Tsuchiya, I. Yamada and the LHD Experiment Group
    • Journal Title

      Plasma and Fusion Research

      Volume: 12

    • NAID

      130005766010

    • Related Report
      2016 Annual Research Report
    • Acknowledgement Compliant
  • [Journal Article] Magnetohydrodynamic stability at the edge region in H-mode plasmas with long edge-localized-mode-free phases in the large helical device2016

    • Author(s)
      Toi, K., Ohdachi, S., Ueda, R., Watanabe, K. Y., Nicolas, T., Suzuki, Y., Ogawa, K., Tanaka, K., Takemura, Y. and LHD Experiment Group
    • Journal Title

      Plasma Phys and Control Fusion

      Volume: 58 Issue: 9 Pages: 094002-094002

    • DOI

      10.1088/0741-3335/58/9/094002

    • NAID

      120007186421

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Developments of frequency comb microwave reflectometer for the interchange mode observations in LHD plasma2016

    • Author(s)
      R. Soga, T. Tokuzawa, K.Y. Watanabe, K. Tanaka, I. Yamada, S. Inagaki and N. Kasuya
    • Journal Title

      Journal of Instrumentation

      Volume: 11

    • NAID

      120007180053

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Magnetic turbulence and pressure gradient feedback effect of the 1/2 mode soft-hard magnetohydrodynamic limit in large helical device2014

    • Author(s)
      J. Varela, K. Y. Watanabe, S. Ohdachi, and Y. Narushima
    • Journal Title

      Phys. Plasmas

      Volume: 9 Issue: 9

    • DOI

      10.1063/1.4895499

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of multi-scale turbulence and non-local transport in LHD plasma2014

    • Author(s)
      T. Tokuzawa, S. Inagaki, K. Ida, K. Itoh, et al.
    • Journal Title

      Phys. Plasmas

      Volume: 21 Issue: 5 Pages: 055904-055904

    • DOI

      10.1063/1.4876619

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Hard magnetohydrodynamic limit in 1/3 sawtooth like activity in LHD2014

    • Author(s)
      J. Varela, K. Y. Watanabe, S. Ohdachi and Y. Narushima
    • Journal Title

      Physics of Plasmas

      Volume: 21 Issue: 3

    • DOI

      10.1063/1.4867066

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characteristics of magnetic island formation due to resistive interchange instability in helical plasma2014

    • Author(s)
      R. Ueda, K. Y. Watanabe, Y. Matsumoto, M. Itagaki, M. Sato and S. Oikawa
    • Journal Title

      Physics of Plasmas

      Volume: 21 Issue: 5

    • DOI

      10.1063/1.4875340

    • Related Report
      2013 Annual Research Report
    • Peer Reviewed
  • [Presentation] LHDにおけるロックトモード様不安定性の安定性解析2016

    • Author(s)
      渡邊清政,岡本征晃1,武村勇輝, 佐藤雅彦, 徳沢季彦, 榊原悟, L.Garcia
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-11-29
    • Related Report
      2016 Annual Research Report
  • [Presentation] ロックトモード様不安定性の実験研究2016

    • Author(s)
      武村勇輝、渡邊清政、徳沢季彦、榊原悟、成嶋吉朗、岡本征晃、大舘暁、鈴木康浩、居田克巳、吉沼幹朗、土屋隼人、山田一博
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-11-29
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] LHDにおける高空間分解ECE計測のための金属レンズ付きアンテナの開発2016

    • Author(s)
      竹原啓太, 徳沢季彦, 渡邉清政, LHD実験グループ
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-11-29
    • Related Report
      2016 Annual Research Report
  • [Presentation] LHDにおけるロックドモード様不安定性発現時のプラズマ回転速度変化の観測2016

    • Author(s)
      徳沢季彦, 武村勇輝, 渡邊清政, 居田克巳, 吉沼幹朗, 榊原悟, 成嶋吉朗, 土屋隼人, 長山好夫, LHD実験グループ
    • Organizer
      プラズマ・核融合学会第33回年会
    • Place of Presentation
      東北大学(仙台市)
    • Year and Date
      2016-11-29
    • Related Report
      2016 Annual Research Report
  • [Presentation] Magnetic island formation in locked‐like mode in helical plasmas2016

    • Author(s)
      T.Tokuzawa, Y.Takemura, K.W.Watanabe, S.Sakakibara, Y.Narushima, H.Tsuchiya, Y.Nagayama, S.Inagaki, K.Ida, M.Yoshinuma, K.Tanaka, Y.Suzuki, I.Yamada, and LHD Experiment Group
    • Organizer
      26th IAEA Fusion Energy Conference
    • Place of Presentation
      国立京都国際会館(京都市)
    • Year and Date
      2016-10-17
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Observation of oscillation of poloidal rotation velocity in LHD2016

    • Author(s)
      T. Tokuzawa, Y. Takemura, K.W. Watanabe, S. Inagaki, K. Ida, M. Yoshinuma, S. Sakakibara, Y. Narushima, H. Tsuchiya, Y. Nagayama, K. Tanaka, I. Yamada, and the LHD Experiment Group
    • Organizer
      18th International Congress on Plasma Physics
    • Place of Presentation
      Kaohsiung, Taiwan
    • Year and Date
      2016-06-27
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] On recent MHD topics of LHD2016

    • Author(s)
      K.Y.Watanabe
    • Organizer
      US-Japan MHD Workshop on “Fundamental understanding of 3-D magnetic field effects for optimization of fusion devices”
    • Place of Presentation
      Toki(Japan)
    • Year and Date
      2016-03-07
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHDにおける外部共鳴摂動磁場のMHD平衡・安定性に対する影響の研究2015

    • Author(s)
      渡邊清政,榊原悟,成嶋吉朗,政宗貞男,武村勇輝,大舘暁,鈴木康浩
    • Organizer
      第32回プラズマ・核融合学会 年会
    • Place of Presentation
      名古屋大学東山キャンパス
    • Year and Date
      2015-11-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] LHD実験における低次MHDモードの内部構造の特徴2015

    • Author(s)
      武村勇輝,渡邊清政,大舘暁,鈴木康浩,田中謙治,榊原悟,成嶋吉朗,山田一博
    • Organizer
      第32回プラズマ・核融合学会 年会
    • Place of Presentation
      名古屋大学東山キャンパス
    • Year and Date
      2015-11-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] 改良したマイクロ波コム反射計を用いたLHDプラズマにおける交換型不安定性の構造観測2015

    • Author(s)
      曽我良太、徳沢季彦、渡邊清政、榊原悟、田中謙治、山田一博、稲垣滋、LHD実験グループ
    • Organizer
      第32回プラズマ・核融合学会 年会
    • Place of Presentation
      名古屋大学東山キャンパス
    • Year and Date
      2015-11-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] Effect of Resonant Magnetic Field on MHD properties in LHD plasmas2015

    • Author(s)
      K.Y.Watanabe, Y.Narushima, S.Sakakibara, S.Ohdachi, Y.Suzuki, Y.Takemura and LHD experiment group
    • Organizer
      20th International Stellarator-Heliotron Workshop
    • Place of Presentation
      Greifswald(Germany)
    • Year and Date
      2015-10-05
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Estimation of internal structure of resistive interchange instability in LHD2015

    • Author(s)
      Y. Takemura, K.Y. Watanabe, S. Ohdachi, K. Tanaka, S. Sakakibara, Y. Narushima, Y. Suzuki and LHD Experiment Group
    • Organizer
      20th International Stellarator-Heliotron Workshop
    • Place of Presentation
      Greifswald(Germany)
    • Year and Date
      2015-10-05
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHDプラズマにおける交換型不安定性の観測とその構造に関する研究2015

    • Author(s)
      曽我良太,渡邊清政,徳沢季彦,LHD研究グループ
    • Organizer
      日本物理学会 第70回年次大会
    • Place of Presentation
      早稲田大学(東京)
    • Year and Date
      2015-03-21 – 2015-03-24
    • Related Report
      2014 Annual Research Report
  • [Presentation] Multi-point Measurements for Study of Plasma Turbulence in the LHD2014

    • Author(s)
      Tokihiko Tokuzawa, Shigeru Inagaki, Akira Ejiri, Ryota Soga, Ichihiro Yamada, Shin Kubo, Mikiro Yoshinuma, Katsumi Ida, Chihiro Suzuki, Kenji Tanaka, Tsuyoshi Akiyama, Naohiro Kasuya1), Kimitaka Itoh, Kiyomasa Watanabe, Hiroshi Yamada, Kazuo Kawahata and LHD EXPERIMENT GROUP
    • Organizer
      Plasma Conference 2014
    • Place of Presentation
      Toki Messe, Niigata (NIigata)
    • Year and Date
      2014-11-18 – 2014-11-21
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] Propagation of Resistive Interchange Modes2014

    • Author(s)
      Masahiko Sato, Akihiro Ishizawa and Noriyoshi Nakajima
    • Organizer
      Plasma Conference 2014
    • Place of Presentation
      Toki Messe, Niigata (NIigata)
    • Year and Date
      2014-11-18 – 2014-11-21
    • Related Report
      2014 Annual Research Report
  • [Presentation] Response of Interchange Instability to Resonant Magnetic Field by External Coil2014

    • Author(s)
      K.Y. WATANABE, S. MSAMUNE, S.SAKAKIBARA, Y. TAKEMURA, M. Sato, S.Ohdachi, Y. Narushima, Y. Suzuki and LHD experiment group
    • Organizer
      24th International Toki Conference (ITC-24) on "Expanding Horizons of Plasma and Fusion Science through Cross-Fertilization"
    • Place of Presentation
      Ceratopia Toki (Toki)
    • Year and Date
      2014-11-04 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] 外部共鳴摂動磁場印加に対する交換型MHD不安定性の応答2014

    • Author(s)
      渡邊 清政, 政宗 貞男, 榊原 悟, 武村 勇輝, 佐藤 雅彦, 大館 暁, 成嶋 吉朗, 鈴木 康浩
    • Organizer
      第10回核融合エネルギー連合講演会
    • Place of Presentation
      筑波大学(筑波)
    • Year and Date
      2014-06-19 – 2014-06-20
    • Related Report
      2014 Annual Research Report

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Published: 2013-05-21   Modified: 2019-07-29  

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