Modeling of the plasma response by the externally applied magnetic field and the validation using imaging diagnostics

• Project/Area Number: 26249144
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Ohdachi Satoshi 核融合科学研究所, ヘリカル研究部, 教授 (00270489)
• Co-Investigator(Kenkyū-buntansha): 鈴木 康浩 核融合科学研究所, ヘリカル研究部, 准教授 (20397558) ; 山本 聡 京都大学, エネルギー理工学研究所, 助教 (70397529) ; 河村 学思 核融合科学研究所, ヘリカル研究部, 助教 (70509520) ; 榊原 悟 核融合科学研究所, ヘリカル研究部, 教授 (90280594)
• Research Collaborator: Du X. D. General Atomics社 ; Evans T. E. General Atomics社 ; Shafer M. General Atomics社
• Project Period (FY): 2014-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥38,610,000 (Direct Cost: ¥29,700,000、Indirect Cost: ¥8,910,000); Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000); Fiscal Year 2015: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000); Fiscal Year 2014: ¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
• Keywords: 磁気島 / 共鳴摂動磁場 / スパースモデリング / トモグラフィー / 核融合プラズマの平衡 / 画像計測 / プラズマ・核融合 / イメージング計測 / 軟X線計測 / MHD不安定性 / 外部摂動磁場 / MHD平衡 / 核融合プラズマ / 国際研究者交流 / 摂動磁場印可 / 周辺MHD揺動

Outline of Final Research Achievements

Change of the topology of the magnetic field which confines the plasma is directory observed on the DIII-D tokamak. Two tangentially viewing soft X-ray camera system located at two toroidal location make it possible to observe such change for the first time. The algorithm for the reconstruction of the local emission where the quite limited amount of the information can be used.

Academic Significance and Societal Importance of the Research Achievements

核融合炉を実現するためには、プラズマを閉じ込めている磁場のトポロジカルな変化を検出し閉じ込め性能に対する影響を詳しく調べる必要がある。これまで、プラズマ内部の静的な構造、例えば磁気島の生成について直接計測する手段がなかったが、本研究により直接的な計測が可能となった。

Research Products

• [Int'l Joint Research] General Atomics社/Oak Ridge National Laboratory(米国)
• [Int'l Joint Research] NFRI/KAIST(韓国)
• [Int'l Joint Research] General Atomic/Ork Ridge National Laboratory(米国)
• [Int'l Joint Research] NFRI/KAIST(韓国)
• [Journal Article] Experimental examination of a method to estimate temporal effect by neutrons and γ-rays on scintillation light in scintillator-based soft x-ray diagnostic of experimental advanced superconducting tokamak and large helical device (2019)
  • Author(s): Bando T.、Ohdachi S.、Zhou R. J.、Zhong G. Q.、Yuan Y.、Hu L. Q.、Ling B. L.
  • Journal Title: Review of Scientific Instruments Volume: 90 Issue: 1 Pages: 013507-013507
  • DOI: 10.1063/1.5054325
  • NAID: 120007184707
  • Peer Reviewed
• [Journal Article] Direct Measurements of Internal Structures of Born-locked Modes and the Key Role in Triggering Tokamak Disruptions (2019)
  • Author(s): X.D. Du, M.W. Shafer, Q.M. Hu, T.E. Evans, E.J. Strait, S. Ohdachi, and Y. Suzuki
  • Journal Title: Physics of Plasmas Volume: in press
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Tomographic Inversion Technique Using Orthogonal Basis Patterns (2019)
  • Author(s): Satoshi OHDACHI, Satoshi YAMAMOTO, Yasuhiro SUZUKI, Shishir PUROHIT, and Naofumi IWAMA
  • Journal Title: Plasma and Fusion Research Volume: in press
  • NAID: 130007663770
  • Peer Reviewed / Open Access
• [Journal Article] Excitation of helically-trapped-energetic-ion driven resistive interchange modes with intense deuterium beam injection and enhanced effect on beam ions/bulk plasmas of LHD (2018)
  • Author(s): Bando T.、Ohdachi S.、Isobe M.、Suzuki Y.、Toi K.、Nagaoka K.、Takahashi H.、Seki R.、Du X.D.、Ogawa K.、Ido T.、Shimizu A.、Ozaki T.、LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 58 Issue: 8 Pages: 082025-082025
  • DOI: 10.1088/1741-4326/aac699
  • NAID: 120007184697
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetic Island detection using dual tangential soft X-ray imaging system on magnetically confined devices (2018)
  • Author(s): Ohdachi, Satoshi and Du, Xiaodi and Shafer, Morgan and Suzuki, Yasuhiro and Evans, Todd
  • Journal Title: APS Meeting Abstracts Volume: -
  • Open Access / Int'l Joint Research
• [Journal Article] Simultaneous excitation of the snake-like oscillations and the m/n = 1/1 resistive interchange modes around the iota = 1 rational surface just after hydrogen pellet injections in LHD plasmas (2018)
  • Author(s): Bando T.、Ohdachi S.、Suzuki Y.、Sakamoto R.、Narushima Y.、Takemura Y.、Watanabe K. Y.、Sakakibara S.、Du X. D.、Motojima G.、Tanaka K.、Morisaki T.、LHD Experiment Group
  • Journal Title: Physics of Plasmas Volume: 25 Issue: 1 Pages: 012507-012507
  • DOI: 10.1063/1.5003058
  • NAID: 120007180071
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observation of the ballooning mode that limits the operation space of the high-density super-dense-core plasma in the LHD (2017)
  • Author(s): Ohdachi S.、Watanabe K.Y.、Tanaka K.、Suzuki Y.、Takemura Y.、Sakakibara S.、Du X.D.、Bando T.、Narushima Y.、Sakamoto R.、Miyazawa J.、Motojima G.、Morisaki T.、LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 6 Pages: 066042-066042
  • DOI: 10.1088/1741-4326/aa6c1e
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 2D turbulence structure observed by a fast framing camera system in linear magnetized device PANTA (2017)
  • Author(s): Ohdachi Satoshi、Inagaki Shigeru、Kobayashi Tatsuya、Goto Motoshi
  • Journal Title: Journal of Physics: Conference Series Volume: 823 Pages: 012009-012009
  • DOI: 10.1088/1742-6596/823/1/012009
  • Peer Reviewed / Open Access
• [Journal Article] Extension of high-beta plasma operation to low-collisionality regime (2017)
  • Author(s): S. Sakakibara, K.Y. Watanabe, H. Funaba, Y. Suzuki, S. Ohdachi, K. Ida, K. Tanaka, T. Tokuzawa, T. Morisaki, M. Osakabe, Y. Takeiri and LHD Experiment Group1
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 6 Pages: 066007-066007
  • DOI: 10.1088/1741-4326/aa65aa
  • NAID: 120007184712
  • Peer Reviewed / Acknowledgement Compliant
• [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] HINT modeling of three-dimensional tokamaks with resonant magnetic perturbation (2017)
  • Author(s): Yasuhiro Suzuki
  • Journal Title: Plasma Physics and Controlled Fusion Volume: 59 Issue: 5 Pages: 054008-054008
  • DOI: 10.1088/1361-6587/aa5adc
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Stochasticity in fusion plasmas (2016)
  • Author(s): Liang, Y., Ida, K., Kobayashi, T., Yoshinuma, M., Suzuki, Y., Narushima, Y., Evans, T. E., Ohdachi, S., Tsuchiya, H. and Inagaki, S.
  • Journal Title: Nucl. Fusion Volume: 56 Issue: 9 Pages: 90201-90201
  • DOI: 10.1088/0029-5515/56/9/090201
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Magnetohydrodynamic stability at the edge region in H-mode plasmas with long edge-localized-mode-free phases in the large helical device (2016)
  • 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
  • Peer Reviewed
• [Journal Article] Developments of scintillator-based soft x-ray diagnostic in LHD with CsI: Tl and P47 scintillators (2016)
  • Author(s): T Bando, S Ohdachi, Y Suzuki
  • Journal Title: Rev. Sci. Instrum Volume: 87 Issue: 11
  • DOI: 10.1063/1.4960418
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Upgrade of the tangentially viewing vacuum ultraviolet (VUV) telescope system for 2D fluctuation measurement in the large helical device (2016)
  • Author(s): ZJ Wang, TF Ming, X Gao, XD Du, S Ohdachi
  • Journal Title: Rev. Sci. Instrum Volume: 87 Issue: 11
  • DOI: 10.1063/1.4959951
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Pressure driven MHD instabilities in the intrinsic and externally enhanced magnetic stochastic region of LHD (2015)
  • Author(s): Ohdachi, S., Suzuki, Y., Tsuchiya, H., Watanabe, K. Y., Sakakibara, S., Narushima, Y., Du, X. D., Ming, T. F., Furukawa, M. and Toi, K.
  • Journal Title: Nulcear Fusion Volume: 55 Issue: 9 Pages: 093006-093006
  • DOI: 10.1088/0029-5515/55/9/093006
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Characteristics of MHD instabilities limiting the beta value in LHD (2015)
  • Author(s): S.Sakakibara, K.Y.Watanabe, Y.Takemura, M.Okamoto, S.Ohdachi, Y.Suzuki, Y.Narushima, K.Ida, M.Yoshinuma, K.Tanaka, T.Tokuzawa, I.Yamada, H.Yamada, Y.Takeiri and LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 55 Issue: 8 Pages: 083020-083020
  • DOI: 10.1088/0029-5515/55/8/083020
  • NAID: 120007184713
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Experimental observation of response to resonant magnetic perturbation and its hysteresis in LHD (2015)
  • Author(s): Y. Narushima, S. Sakakibara, S. Ohdachi, Y. Suzuki, K.Y. Watanabe, S. Nishimura, S. Satake, B. Huang, M. Furukawa, Y. Takemura, K. Ida, M. Yoshinuma, I. Yamada and The LHD Experiment Group
  • Journal Title: Nuclear Fusion Volume: 55 Issue: 7 Pages: 073004-073004
  • DOI: 10.1088/0029-5515/55/7/073004
  • NAID: 120007046129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of 2D soft X-ray measurement system in the large helical device (2014)
  • Author(s): Y. Takemura, S. Ohdachi, et. al.,
  • Journal Title: Review of Scintific Instrument Volume: 85 Issue: 11
  • DOI: 10.1063/1.4890261
  • Peer Reviewed / Acknowledgement Compliant
• [Presentation] Magnetic Island detection using dual tangential soft X-ray imaging system on magnetically confined devices (2018)
  • Author(s): Ohdachi, Satoshi and Du, Xiaodi and Shafer, Morgan and Suzuki, Yasuhiro and Evans, Todd
  • Organizer: American Physical Society, Division of Plasma Physics
  • Int'l Joint Research
• [Presentation] EXCITATION MECHANISM OF THE ENERGETIC PARTICLE DRIVEN RESISTIVE INTERCHANGE MODE AND STRATEGY TO CONTROL THE MODE IN LARGE HELICAL DEVICE (2018)
  • Author(s): S. OHDACHI, H. TAKAHASHI, Y. SUZUKI, M. OSAKABE, T. MORISAKI, T. BANDO, K. NAGAOKA, K. Y. WATANABE, K. TOI X. D. DU
  • Organizer: IAEA Fusion Energy Conference
  • Int'l Joint Research
• [Presentation] Tomographic Inversion Technique Using Orthogonal Basis Patterns (2018)
  • Author(s): Satoshi OHDACHI, Satoshi YAMAMOTO, Yasuhiro SUZUKI, Shishir PUROHIT, and Naofumi IWAMA
  • Organizer: International Toki Conference
  • Int'l Joint Research
• [Presentation] Energetic Particle Driven Resistive Interchange Mode in the Deuterium LHD Experiments (2017)
  • Author(s): S. Ohdachi, T. Bando, M. Isobe et al.
  • Organizer: International Stellarator/Heliotron Workshop 2017
  • Int'l Joint Research / Invited
• [Presentation] Excitation and suppression of trapped-energetic-ion driven resistive interchange modes in LHD plasmas with intense deuterium beam injection (2017)
  • Author(s): S. Ohdachi, T. Bando, M. Isobe et al.
  • Organizer: 15th IAEA Technical Meeting on Energetic Particles in Magnetic Confinement Systems 2017
  • Int'l Joint Research
• [Presentation] Quantitative estimation of beta-sequence effects on edge magnetic topology and its impact of divertor heat flux in LHD (2017)
  • Author(s): Y. Suzuki, S. Sakakibara, K. Watanabe et al.
  • Organizer: International Stellarator/Heliotron Workshop 2017
  • Int'l Joint Research
• [Presentation] Observation of the ballooning mode that limits the operation space of the high-density super-dense-core plasma in the LHD (2016)
  • Author(s): S. Ohdachi, et. al.,
  • Organizer: 26th IAEA Fusion Energy Conference
  • Place of Presentation: kyoto, Japan
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] Effect of the RMP on the ELM-like activities observed in the high-beta H-mode of LHD (2015)
  • Author(s): S. Ohdachi, et. al.
  • Organizer: 20th International Stellarator Heliotron Workshop
  • Place of Presentation: Greifswald, Germany
  • Year and Date: 2015-10-05
  • Int'l Joint Research
• [Presentation] A study of the fluctuations observed in the PANTA device using imaging diagnostics (2014)
  • Author(s): S. Ohdachi
  • Organizer: Plasma Conference 2014
  • Place of Presentation: 新潟、日本
  • Year and Date: 2014-11-18 – 2014-11-21
• [Presentation] Effects of stochastic field lines on the pressure driven MHD instabilities in the Large Helical Device” (2014)
  • Author(s): S. Ohdachi, et. al.,
  • Organizer: Americal Physical Society, Department of Plasma Physics
  • Place of Presentation: New Orleans, USA
  • Year and Date: 2014-10-27 – 2014-10-31
• [Presentation] Pressure driven MHD instabilities in intrinsic and externally enhanced magnetic stochastic region of LHD (2014)
  • Author(s): S. Ohdachi, et. al.,
  • Organizer: IAEA Fusion Energy Conference
  • Place of Presentation: St. Petersburg, Russia
  • Year and Date: 2014-10-13 – 2014-10-18