Measurement of Electron Temperature Profile using BXO Mode Conversion in Overdense Plasmas

• Project/Area Number: 25420885
• 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: Nagasaki Kazunobu 京都大学, エネルギー理工学研究所, 教授 (20237506)
• Co-Investigator(Renkei-kenkyūsha): KOBAYASHI Shinji 京都大学, エネルギー理工学研究所, 助教 (70346055) ; YAMAMOTO Satoshi 京都大学, エネルギー理工学研究所, 助教 (70397529) ; OHSHIMA Shinsuke 京都大学, エネルギー理工学研究所, 助教 (00469610)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 電子バーンスタイン波 / カットオフ / モード変換 / 電子温度計測 / オーバーデンスプラズマ / ラジオメータ

Outline of Final Research Achievements

We have studied the possibility of electron temperature profile measurement using electron Bernstein waves (EBW) in order to overcome accessible density limit, so called cut-off density.
A ray tracing code, KRAY, has been developed to trace the BXO mode conversion, which includes three dimensional magnetic configuration with finite beta. The calculation results show that the OX mode conversion efficiency of nearly 100% is available with current ECRH antenna system. Based on this calculation, we have designed and constructed a 8-channel radiometer system for EBW detection. We confirmed that the electron cyclotron waves of nW level power can be measured.

Research Products

• [Int'l Joint Research] Columbia University(米国)
• [Int'l Joint Research] Max-Planck Institute for Plasma Physics(ドイツ)
• [Int'l Joint Research] CIEMAT(スペイン)
• [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] Neoclassical parallel flow calculation in the presence of external parallel momentum sources in Heliotron J (2016)
  • Author(s): K. Nishioka, Y. Nakamura, S. Nishimura, H. Y. Lee, S. Kobayashi, T. Mizuuchi, K. Nagasaki, H. Okada, T. Minami, S. Kado, S. Yamamoto, S. Ohshima, S. Konoshima and F. Sano
  • Journal Title: Physics of Plasmas Volume: 23 Issue: 3 Pages: 032511-032511
  • DOI: 10.1063/1.4944913
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Summary of ECRH/ECCD Presentations at EC18 (2015)
  • Author(s): K. Nagasaki
  • Journal Title: EPJ Web of Conferences Volume: 87 Pages: 02001-02001
  • Open Access
• [Journal Article] Interpretation of Plasma Fluctuation Data from Combination Measurement of a Perpendicular-View Camera and a Langmuir Probe in Heliotron J (2015)
  • Author(s): L. Zang, T. Mizuuchi, N. Nishino, S. Ohshima, S. Yamamoto, Y. C. Sun, K. Kasajima, M. Takeuchi, K. Mukai, H. Y. Lee, N. Kenmochi, Y. Ohtani, K. Nagasaki, S. Kado, H. Okada, T. Minami, S. Kobayashi, N. Shi, S. Konoshima, Y. Nakamura, F. Sano
  • Journal Title: Fusion Science and Technology Volume: 68 Issue: 4 Pages: 758-765
  • DOI: 10.13182/fst14-862
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of a New Far Infrared Laser Interferometer in Heliotron J and First Results (2015)
  • Author(s): Y. Ohtani, S. Ohshima, N. Asavathavornvanit, T. Akiyama, T. Minami, K. Tanaka, K. Nagasaki, N. Shi, T. Mizuuchi, N. B. Marushchenko, S. Kobayashi, H. Okada, S. Kado, S. Yamamoto, L. Zang, G. M. Weir, N. Kenmochi, S. Konoshima, Y. Nakamura, Y. Turkin and F. Sano
  • Journal Title: Plasma and Fusion Research Volume: 10 Issue: 0 Pages: 1402091-1402091
  • DOI: 10.1585/pfr.10.1402091
  • NAID: 130005292404
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Second harmonic ECRH breakdown experiments in the TJ-II stellarator (2015)
  • Author(s): A. Cappa, E. Ascasibar, F. Castejon, D. Tafalla, F. Tabares, M. Ochando, J. Romero, E. de la Cal, J. Martinez and K. Nagasaki
  • Journal Title: Nuclear Fusion Volume: 55 Issue: 4 Pages: 043018-043018
  • DOI: 10.1088/0029-5515/55/4/043018
  • Peer Reviewed
• [Journal Article] Experimental characterization of plasma start-up using ECRH in preparation of W7-X operation (2015)
  • Author(s): M. Preynas, D. Assmus, H. Igami, S. Kado, S. Kobayashi, S. Kubo, H.P. Laqua, T. Mutoh, K. Nagasaki, M. Otte, T. Shimozuma, T. Stange and Y. Yoshimura
  • Journal Title: EPJ Web of Conferences Volume: 87 Pages: 02005-02005
  • DOI: 10.1051/epjconf/20158702005
  • Peer Reviewed / Open Access
• [Journal Article] Long-pulse Plasma Discharges by Upgraded ECH System in the LHD (2015)
  • Author(s): Y. Yoshimura, H. Kasahara, K. Nagasaki, M. Tokitani, N. Ashikawa, Y. Ueda, S. Ito, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, M. Nishiura, S. Kobayashi, Y. Mizuno, K. Okada, S. Ogasawara, R. Makino, I. Yamada, T. Tokuzawa, K. Tanaka, T. Mutoh, H. Yamada, and LHD Experiment Group
  • Journal Title: European Physical Journal Web of Conferences Volume: 87 Pages: 02020-02020
  • DOI: 10.1051/epjconf/20158702020
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] First measurement of time evolution of electron temperature profiles with Nd:YAG Thomson scattering system on Heliotron J (2014)
  • Author(s): N. Kenmochi, T. Minami, C. Takahashi, S. Tei, T. Mizuuchi, S. Kobayashi, K. Nagasaki, Y. Nakamura, H. Okada, S. Kado, S. Yamamoto, S. Ohshima, S. Konoshima, N. Shi, L. Zang, Y. Ohtani, K. Kasajima, and F. Sano
  • Journal Title: Review of Scientific Instruments. Volume: 85 Issue: 11
  • DOI: 10.1063/1.4890255
  • Peer Reviewed
• [Journal Article] Stabilization of energetic-ion-driven MHD modes by ECCD in Heliotron J (2013)
  • Author(s): K. Nagasaki, S. Yamamoto, S. Kobayashi, et al.
  • Journal Title: Nuclear Fusion Volume: 53 Issue: 11 Pages: 113041-113041
  • DOI: 10.1088/0029-5515/53/11/113041
  • Peer Reviewed
• [Journal Article] Development of a Laser Timing Controller for the High Time-Resolution Nd:YAG Thomson Scattering System in Heliotron J (2013)
  • Author(s): N. Kenmochi, T. Minami, S. Arai, C. Takahashi, T. Mizuuchi, S. Kobayashi, K. Nagasaki, Y. Nakamura, H. Okada, S. Yamamoto, S. Konoshima, S. Ohshima, K. Mukai, H. Y. Lee, L. Zang, Y. Nagae, M. Sha, Y. Ohtani, K. Kasajima, T. Harada, H. Watada, H. Fukushima, Y. Sugimoto, Y. Nakamura, K. Hashimoto, F. Sano
  • Journal Title: Plasma and Fusion Research Volume: 8 Issue: 0 Pages: 2402117-2402117
  • DOI: 10.1585/pfr.8.2402117
  • NAID: 130004687670
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] Observation of Edge Filamentary Structure Motion during Supersonic Molecular-Beam Injection Using a Fast Camera in Heliotron J (2013)
  • Author(s): L. Zang, N. Nishino, T. Mizuuchi, S. Ohshima, M. Takeuchi, K. Kasajima, M. Sha, K. Mukai, H. Y. Lee, K. Nagasaki, H. Okada, T. Minami, S. Kobayashi, S. Yamamoto, S. Konoshima, Y. Nakamura, F. Sano
  • Journal Title: Plasma and Fusion Research Volume: 8 Issue: 0 Pages: 1402066-1402066
  • DOI: 10.1585/pfr.8.1402066
  • NAID: 130004467863
  • ISSN: 1880-6821
  • Peer Reviewed
• [Journal Article] Gas fueling effect on plasma profile in Heliotron J (2013)
  • Author(s): T. Mizuuchi, H.Y. Lee, K. Mukai, K. Yamamoto, S. Kobayashi, H. Okada, S. Yamamoto, S. Ohshima, L. Zang, K. Nagasaki, et al.
  • Journal Title: Journal of Nuclear Materials Volume: 438 Pages: S453-S458
  • DOI: 10.1016/j.jnucmat.2013.01.092
  • Peer Reviewed
• [Journal Article] Observation of Edge Plasma Fluctuations with a Fast Camera in Heliotron J (2013)
  • Author(s): L. Zang, M. Takeuchi, N. Nishino, T. Mizuuchi, S. Ohshima, K. Kasajima, M. Sha, K. Mukai , H. Y. Lee, K. Nagasaki, H. Okada, T. Minami, S. Kobayashi, S. Yamamoto, K. Hanatani, Y. Nakamura, S. Konoshima, F. Sano
  • Journal Title: Plasma Science and Technology Volume: 15 Issue: 3 Pages: 213-213
  • DOI: 10.1088/1009-0630/15/3/04
  • Peer Reviewed
• [Journal Article] Effect of magnetic field configuration on parallel plasma flow during neutral beam injection in Heliotron J (2013)
  • Author(s): H Lee, S Kobayashi, M Yokoyama, T Mizuuchi, T Minami, T Harada, K Nagasaki, H Okada, T Minami, S Yamamoto, S Murakami, Y Nakamura, S Konoshima, S Ohshima, L Zang and F Sano
  • Journal Title: Plasma Phys. Control. Fusion Volume: 55 Issue: 3 Pages: 35012-35012
  • DOI: 10.1088/0741-3335/55/3/035012
  • Peer Reviewed
• [Presentation] Development of Electron Bernstein Emission Diagnostic for Heliotron J and LHD (2015)
  • Author(s): K. Nagasaki, Y. Nakamura, S. Kamioka, H. Igami, F. Volpe, T. Stange, K. Sakamoto, H. Okada, T. Minami, S. Kado, S. Kobayashi, S. Yamamoto, S. Ohshima, S. Konoshima, N. Kenmochi, Y. Otani, Y. Yoshimura, N. B. Marushchenko, T. Mizuuchi
  • Organizer: 25th International Toki Conference
  • Place of Presentation: Ceratopia Toki, Japan
  • Year and Date: 2015-11-03
  • Int'l Joint Research
• [Presentation] 3D Magnetic Field Effect on ECRH/ECCD in Helical Systems (2015)
  • Author(s): K. Nagasaki, T. Minami, H. Kenmochi, K. Sakamoto, Y. Nakamura, H. Okada, S. Kado, S. Kobayashi, S. Yamamoto, S. Ohshima, G. M. Weir, S. Konoshima, K. Hada, Y. Ohtani, X. Lu, H. Kishikawa, N. Asavathavornvanit, K. Murakami, Y. Yoshimura, H. Igami, T. Mizuuchi
  • Organizer: 20th International Stellarator-Heliotron Workshop
  • Place of Presentation: Greifswald, Germany
  • Year and Date: 2015-10-05
  • Int'l Joint Research
• [Presentation] Issues on ECCD in Negative Triangular Tokamaks and DEMO Reactor (2015)
  • Author(s): K. Nagasaki
  • Organizer: 1st Negative Triangularity Tokamak Concept Reactor Workshop
  • Place of Presentation: Hefei, Anhui, People’s Republic of China
  • Year and Date: 2015-05-09
  • Int'l Joint Research
• [Presentation] Effect of Magnetic Shear on Propagation and Absorption of EC Waves (2015)
  • Author(s): K. Nagasaki
  • Organizer: Japan-Korea Workshop on Heating and Current Drive
  • Place of Presentation: Daejeon Convention Center, Daejeon
  • Year and Date: 2015-02-26 – 2015-02-27
• [Presentation] Development of Electron Bernstein Emission Diagnostic in Heliotron J (2014)
  • Author(s): K. Nagasaki, Y. Nakamura, S. Kamioka, F. Volpe, H. Igami, K. Sakamoto, T. Mizuuchi, H. Okada, T. Minami, S. Kado, S. Kobayashi, S. Yamamoto, S. Ohshima, S. Konoshima, L. Zang, N. Kenmochia, Y. Ohtania, N. Marushchenko, Y. Turkin, F. Sano
  • Organizer: 24th International Toki Conference (ITC24) 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
• [Presentation] Plasma Start-up Using Microwaves in Fusion Devices (2014)
  • Author(s): K. Nagasaki, S. Kobayashi, M. Preynas, K. Hada, T. Mizuuchi, H. Okada, T. Minami, S. Kado, K. Masuda, Y. Nakamura, S. Yamamoto, S. Ohshima, S. Konoshima, K. Sakamoto, L. Zang, N. Kenmochi, Y. Otani, A. Isayama, S. Ide, F. Sano
  • Organizer: The 9th International Workshop “Strong Microwaves and Terahertz Waves: Sources and Applications
  • Place of Presentation: Nizhny Novgorod - Perm - Nizhny Novgorod
  • Year and Date: 2014-07-24 – 2014-07-30
• [Presentation] Control of Energetic-Particle-Driven Modes by ECH/ECCD in Helical Systems (2014)
  • Author(s): K. Nagasaki, S. Yamamoto, S. Kobayashi, K. Nagaoka, E. Ascasibar, M. Osakabe, Y. Yoshimura, T. Mizuuchi, H. Okada, T. Minami, S. Kado, S. Ohshima, S. Konoshima, N. Shi, K. Sakamoto, Y. Nakamura, L. Zang, N. Kenmochi, Y. Ohtani, F. Volpe, N. Marushchenko, F. Sano and the LHD experiment group
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
  • Place of Presentation: Nara Prefectural New Public Hall, Nara
  • Year and Date: 2014-04-22 – 2014-04-25
• [Presentation] Summary of ECRH/ECCD Session (2014)
  • Author(s): K. Nagasaki, April 22nd-25th, Nara Prefectural New Public Hall, Nara, 2014
  • Organizer: 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
  • Place of Presentation: ara Prefectural New Public Hall, Nara
  • Year and Date: 2014-04-22 – 2014-04-25
  • Invited
• [Presentation] Issues of Plasma Start-up in Stellarator/Heliotron Devices (2014)
  • Author(s): K. Nagasaki
  • Organizer: 13th Co-ordinated Working Group Meeting
  • Place of Presentation: Kyoto University
• [Presentation] Heating and Diagnostic Using Electron Bernstein Waves in Heliotron J (2013)
  • Author(s): K. Nagasaki, N. Fujita, Y. Nakamura, F. Volpe, K. Sakamoto, T. Mizuuchi, H. Okada, T. Minami, S. Kado, S. Kobayashi, S. Yamamoto, S. Ohshima, N. Shi, S. Konoshima, L. Zang, N. Kenmochi, H. Igami, Y. Yoshimura, N. B. Marushchenko, F. Sano
  • Organizer: Joint 19th ISHW and 16th IEA-RFP workshop
  • Place of Presentation: Padova University, Italy
• [Presentation] ヘリオトロンJ における電子バーンスタイン放射計測システムの開発 (2013)
  • Author(s): 長崎百伸、F. Volpe、中村祐司、藤田直己、坂本欣三、水内亨、岡田浩之、南貴司、門信一郎、小林進二、山本聡、大島慎介、史楠、木島滋、L. Zang、釼持尚輝、伊神弘恵、吉村泰夫、N. Marushchenko、佐野史道
  • Organizer: プラズマ・核融合学会第30回年会
  • Place of Presentation: 東京工業大学
• [Remarks] 京都大学エネルギー理工学研究所長﨑研究室
  • URL: http://www.iae.kyoto-u.ac.jp/beam/index_j.html