Study of turbulent density fluctuation observed before H-mode transition based on development of 2-dimensional beam emission spectroscopy

• Project/Area Number: 15K06645
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Kyoto University
• Principal Investigator: Kobayashi Shinji 京都大学, エネルギー理工学研究所, 助教 (70346055)
• Co-Investigator(Renkei-kenkyūsha): Kado Shin-ichiro 京都大学, エネルギー理工学研究所, 准教授 (10300732) ; Oishi Tetsutaro 核融合科学研究所, 高密度プラズマ物理研究系, 助教 (80442523) ; Ohshima Shinsuke 京都大学, エネルギー理工学研究所, 助教 (00469610)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2015: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
• Keywords: ビーム放射分光 / 密度揺動 / ヘリカルプラズマ / H-mode遷移 / 前駆振動 / ビーム放射分光法 / 2次元密度揺動分布 / 乱流揺動 / アバランシェフォトダイオード

Outline of Final Research Achievements

In this research, 2-dimensional (2D) density fluctuation measurement system using beam emission spectroscopy (BES) has been prepared to obtain MHD and high-frequency turbulent fluctuations. Especially, target of this research is to clarify the oscillations obtained before H-mode transition triggered by high-intensity gas puffing in Heliotron J. The frequency-wavenumber vector has been obtained by the preparation of the 2D-BES system. By applying envelope analysis to the high-frequency density fluctuation observed before the H-mode transition, a clear correlation between the high-frequency fluctuation and the low frequency density fluctuation corresponding to the particle exhaust phenomena has been found. One candidate to explain the phenomena is non-linear coupling between the two fluctuations.

Research Products

• [Int'l Joint Research] CIEMAT(スペイン)
• [Int'l Joint Research] Univ. Wisconsin-Madison(米国)
• [Int'l Joint Research] University of Wisconsin(米国)
• [Int'l Joint Research] CIEMAT(Spain)
• [Int'l Joint Research] 核工業西南物理研究院(中国)
• [Int'l Joint Research] HSX group, University of Wisconsin(米国)
• [Journal Article] Study of Plasma Behavior during ECRH Injection in the GAMMA 10 SMBI Experiments (2018)
  • Author(s): Islam Md. Maidul、Nakashima Yousuke、Kobayashi Shinji、Nishino Nobuhiro、Ichimura Kazuya、et al.,
  • Journal Title: Journal of Physics: Conference Series Volume: 959 Pages: 012007-012007
  • DOI: 10.1088/1742-6596/959/1/012007
  • NAID: 120006654160
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Poloidal flow velocity measurement in high-density NBI plasmas of Heliotron J (2018)
  • Author(s): Xiangxun LU, Shinji KOBAYASHI, Shun TANOHIRA, Katsumi IDA, Shin NISHIMURA, et al.,
  • Journal Title: Plasma and Fusion Research Volume: 印刷中
  • NAID: 130007437804
  • Peer Reviewed / Open Access
• [Journal Article] Development of ultra-fast charge exchange recombination spectroscopy for temperature and flow velocity fluctuation measurements in Heliotron J (2017)
  • Author(s): S. Kobayashi, X.X. Lu, K. Ida, T. Kobayashi, M. Yoshinuma, S. Kado, S. Ohshima, K. Nagasaki, H. Okada, T. Minami, S. Yamamoto, D.L. Yu, Y. Nakamura, A. Ishizawa, S. Nishimura, K. Nishioka, S. Konoshima, T. Mizuuchi
  • Journal Title: Proc. 44st EPS conf. Plasma Physics Volume: 41F
  • Open Access / Int'l Joint Research
• [Journal Article] Suppression of fast-ion-driven MHD instabilities by ECH/ECCD on Heliotron J (2017)
  • Author(s): Yamamoto S.、Nagasaki K.、Kobayashi S.、Nagaoka K.、Cappa A.、Okada H.、Minami T.、Kado S.、Ohshima S.、Konoshima S.、Nakamura Y.、Ishizawa A.、Weir G.M.、Kenmochi N.、Ohtani Y.、Lu X.、Tawada Y.、Kokubu D.、Mizuuchi T.
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 12 Pages: 126065-126065
  • DOI: 10.1088/1741-4326/aa8f04
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Multi-machine analysis of turbulent transport in helical systems via gyrokinetic simulation (2017)
  • Author(s): A. Ishizawa, Y. Kishimoto, T.-H. Watanabe, H. Sugama, K. Tanaka, S. Satake, S. Kobayashi, K. Nagasaki, Y. Nakamura
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 6 Pages: 066010-066010
  • DOI: 10.1088/1741-4326/aa6603
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] ビーム放射分光が拓くMHD・乱流揺動の時空間構造 (2017)
  • Author(s): 小林進二
  • Journal Title: J. Plasma Fusion Res. Volume: 93 Pages: 2-9
  • Open Access / Acknowledgement Compliant
• [Journal Article] Development of beam emission spectroscopy for turbulence transport study in Heliotron J (2016)
  • Author(s): S. Kobayashi, S. Ohshima, H. Matsuda, X.X. Lu, D. Kokubu, K. Ida, T. Kobayashi, M. Yoshinuma, S. Kado, T. Oishi, K. Nagasaki, H. Okada, T. Minami, S. Yamamoto, Y. Nakamura, A. Ishizawa, N. Kenmochi, Y. Otani, S. Konoshima, T. Mizuuchi
  • Journal Title: Review of Scientific Instruments Volume: 87 Issue: 11
  • DOI: 10.1063/1.4959949
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Faraday-cup-type lost fast ion detector on Heliotron J (2016)
  • Author(s): S. Yamamoto, K. Ogawa, M. Isobe, D.S. Darrow, S. Kobayashi, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Ohshima, G.M. Weir, Y. Nakamura, S. Konoshima, N. Kemmochi, Y. Ohtani, T. Mizuuchi
  • Journal Title: Review of Scientific Instruments Volume: 87 Issue: 11
  • DOI: 10.1063/1.4960310
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effect of Laval Nozzle in the GAMMA 10 SMBI Experiments (2016)
  • Author(s): M.M. Islam, Y. Nakashima, S. Kobayashi, N. Nishino, Y. Nakano, K. Hosoi, K. Ichimura, Md.S. Islam, K. Shimizu, K. Fukui, M. Ohuchi, A. Terado, M. Yoshikawa, J. Kohagura, M. Hirata, R. Ikezoe, X. Wand, M. Ichimura, M. Sakamoto, T. Imai
  • Journal Title: Plasma and Fusion Research Volume: 11 Issue: 0 Pages: 2402053-2402053
  • DOI: 10.1585/pfr.11.2402053
  • NAID: 130005395219
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Characteristics of SMBI fueling with laval nozzle in GAMMA 10 based on experimental and simulation results (2016)
  • Author(s): M. M. Islam, Y. Nakashima, S. Kobayashi, N. Nishino, K. Hosoi, K. Ichimura, M. S. Islam, K. Fukui, K. Shimizu, M. Ohuchi, M. Arai, T. Yokodo, G. Lee, M. Yoshikawa, J. Kohagura, M. Hirata, R. Ikezoe, M. Ichimura, M. Sakamoto, and T. Imai
  • Journal Title: AIP Conference Proceedings Volume: 1771 Pages: 30018-30018
  • DOI: 10.1063/1.4964174
  • Peer Reviewed / Open Access
• [Journal Article] Edge plasma responses to energeticparticle- driven MHD instability in Heliotron J (2016)
  • Author(s): S. Ohshima, S. Kobayashi, S. Yamamoto, その他
  • Journal Title: Nuclear Fusion Volume: 56 Issue: 1 Pages: 016009-016009
  • DOI: 10.1088/0029-5515/56/1/016009
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] One-Dimensional Analysis of ECRH-Assisted Plasma Start-Up in JT-60SA (2015)
  • Author(s): Kazuyoshi Hada, Kazunobu Nagasaki, Kai Masuda, Shinji Kobayashi, Shunsuke Ide, Akihiko Isayama, Ken Kajiwara
  • Journal Title: Fusion Science and Technology Volume: 67 Issue: 4 Pages: 693-704
  • DOI: 10.13182/fst14-811
  • Peer Reviewed
• [Presentation] Configuration Control Effects on Confinement, Transport and Stability in a Helical-Axis Heliotron Device, Heliotron J (2017)
  • Author(s): T. Mizuuchi, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Kobayashi, S. Yamamoto, S. Ohshima, X.X. Lu, N. Kenmochi, Y. Ohtani, K. Nishioka, L. Zang, G. Weir, D.L. Yu, S.
  • Organizer: International Stellarator-Heliotron Workshop
  • Int'l Joint Research / Invited
• [Presentation] 高性能磁場閉じ込めプラズマを目指した粒子補給法の検討 (2017)
  • Author(s): 小林進二
  • Organizer: 筑波大学プラズマ研究センターシンポジウム
• [Presentation] Investigation of Plasma Behavior during ECRH Injection in the GAMMA 10 SMBI Experiments (2017)
  • Author(s): M.M. Islam, Y. Nakashima, S. Kobayashi, N. Nishino, K. Hosoi, K. Ichimura, M. S. Islam, K. Fukui, M. Ohuchi, T. Yokodo, G. Lee, S. Yamashita, T. Yoshimoto, M. Yoshikawa, J. Kohagura, M. Hirata, R. Ikezoe, M. Ichimura, M. Sakamoto, T. Imai
  • Organizer: Plasma Conference2017
• [Presentation] 超高速荷電交換再結合分光装置の開発 (2016)
  • Author(s): 小林進二，呂湘潯，居田克巳，小林達哉，吉沼幹朗，門信一郎，大島慎介，長崎百伸，岡田浩之，南貴司，山本聡，中村祐司，石澤明宏， 西岡賢二，木島滋，水内亨
  • Organizer: 第33回プラズマ・核融合学会年会
  • Place of Presentation: 東北大学青葉山キャンパス
  • Year and Date: 2016-11-29
• [Presentation] Study of H-Mode Transition Triggered by High-Intensity Gas Puffing in NBI Plasmas of Heliotron J (2016)
  • Author(s): S. Kobayashi, S. Ohshima, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Yamamoto, G. Weir, M. Kirimoto, H. Matsuda, K. Ida, T. Kobayashi, Y. Nakamura, A. Ishizawa, N .Kenmochi, Y. Otani, X. Lu, Y. Nakashima, K. Watanabe, R. Seki, S. Murakami, Y. Suzuki, S. Konoshima, T. Mizuuchi
  • Organizer: 26th IAEA Fusion Energy Conference
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] ヘリオトロンJにおける高強度ガスパフを用いたH-mode遷移の研究 (2016)
  • Author(s): 小林進二，大島慎介，松田啓嗣，長崎百伸，岡田浩之，南貴司，門信一郎，山本聡，G.M.Weir，釼持尚輝，大谷芳明，X.X.Lu，居田克巳，小林達哉，中嶋洋輔，中村祐司，石澤明宏，鈴木康浩，村上定義，渡邊清政，關良輔，木島滋，水内亨
  • Organizer: 第11回 核融合エネルギー連合講演会
  • Place of Presentation: 九州大学伊都キャンパス
  • Year and Date: 2016-07-14
• [Presentation] Characteristics of low frequency fluctuation at L-H transition in NBI plasmas of Heliotron J (2016)
  • Author(s): S. Kobayashi, S. Ohshima, H. Matsuda, D. Kokubu, K. Ida, T. Kobayashi, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Yamamoto, Y. Nakashima, Y. Nakamura, A. Ishizawa, N. Kenmochi, Y. Otani, X. Lu, K. Watanabe, R. Seki, S. Murakami, Y. Suzuki, S. Konoshima T. Mizuuchi
  • Organizer: 6th Asia Pacicic Transport Woiking Group (APTWG) International Conference
  • Place of Presentation: Korea University, Seoul, Korea
  • Year and Date: 2016-06-21
  • Int'l Joint Research
• [Presentation] Development of Beam Emission Spectroscopy for Turbulence Transport Study in Heliotron J (2016)
  • Author(s): S. Kobayashi, S. Ohshima, H. Matsuda, X. X. Lu, D. Kokubu, K. Ida, T. Kobayashi, M. Yoshinuma, S. Kado, T. Oishi, K. Nagasaki, H. Okada, T. Minami, S. Yamamoto, Y. Nakamura, A. Ishizawa, N. Kenmochi, Y. Otani, S. Konoshima, T. Mizuuchi
  • Organizer: 21st topical conference on high temperature plasma diagnostics
  • Place of Presentation: Madison, Wisconshin, U.S.A.
  • Year and Date: 2016-06-05
  • Int'l Joint Research
• [Presentation] Development of Ultrafast Charge-eXchange Recombination Spectroscopy System in Heliotron J (2016)
  • Author(s): X.X. Lu, S. Kobayashi, H. Matsuda, K. Ida, T. Kobayashi, M. Yoshinuma, K. Nagasaki, S. Kado, H. Okada, T. Minami, S. Ohshima, S. Yamamoto, N. Kenmochi, Y. Otani, Y. Nakano, D. Od, D. Kokubu, A. Ishizawa, Y. Nakamura, S. Konoshima, T. Mizuuchi "
  • Organizer: 21st topical conference on high temperature plasma diagnostics
  • Place of Presentation: Madison, Wisconshin, U.S.A.
  • Year and Date: 2016-06-05
  • Int'l Joint Research
• [Presentation] ビーム放射分光計測が拓くMHD・乱流揺動の時空間構造 (2015)
  • Author(s): 小林進二
  • 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
  • Invited
• [Presentation] Characteristics of low frequency oscillation during L-H dithering phase in high density plasmas of Heliotron J (2015)
  • Author(s): S.Kobayashi, S.Ohshima, K.Nagasaki, その他
  • Organizer: 15th International Workshop on H-Mode and Transport Barrier Physics
  • Place of Presentation: Garching, Germany
  • Year and Date: 2015-10-19
  • Int'l Joint Research
• [Presentation] Rapid NBI plasma initiation using pre-ionization method by non-resonant microwave injection in Heliotron J (2015)
  • Author(s): S.Kobayashi, K.Nagasaki, T.Stange, その他
  • Organizer: 20th International Stellarator-Heliotron Workshop
  • Place of Presentation: Greifswald, Germany
  • Year and Date: 2015-10-05
  • Int'l Joint Research
• [Remarks] プラズマエネルギー研究分野ホームページ
  • URL: http://www.iae.kyoto-u.ac.jp/new-iae//organization/generation/plasma.html
• [Remarks] 京都大学エネルギー理工学研究所水内研究室
  • URL: http://www.center.iae.kyoto-u.ac.jp/plasmak/index.html