Developments of meta-material based phased-array antenna for millimeter-wave Doppler radar

• Project/Area Number: 17K18773
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Research Field: Plasma science and related fields
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Tokuzawa Tokihiko 核融合科学研究所, ヘリカル研究部, 准教授 (90311208)
• Project Period (FY): 2017-06-30 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: メタマテリアル / ドップラーレーダ / フェーズドアレイ / 周波数コム / プラズマ計測

Outline of Final Research Achievements

Millimeter-wave Doppler radar can measure the electron density fluctuations and velocities in fusion plasmas. In order to improve the performance of the Doppler radar to enable multi-dimensional vector measurement of the flow velocity, the developments to innovative antennas that can simultaneously emit millimeter-wave beams in any direction. The following two issues were addressed for this aim. (1) Phased-array systems without scanning time: By using multiple frequencies simultaneously, it was demonstrated that the beam is possible to simultaneously irradiate. (2)Metamaterials-based broadband phasers: In order to give accurate phase difference to each antenna element over a wide frequency range, the application as a metasurface reflective phase shifter has been studied and evaluated, and its broadband capability has been confirmed.

Academic Significance and Societal Importance of the Research Achievements

核融合発電炉の早期実現による安定した電力供給は社会に良い影響を与えることが期待できるが、性能の良い核融合炉実現のためには高温プラズマの物理を理解し制御する必要がある。特に乱流の特性を理解する上で、本研究によりドップラーレーダの同時多方向照射が広帯域性をもって実現できることを示したこと、これによって多次元ベクトル計測が可能となることは、核融合プラズマ閉じ込め研究において非常に高い意義を持つ。また、新しい領域の研究素材であるメタマテリアルの応用事例の一つとして、核融合プラズマ分野が新たに加わったことはその広い可能性を示したこととして意義がある。

Research Products

• [Journal Article] Non-Contact and Non-Invasive Driver's Monitor Using Microwave Reflectometer (2020)
  • Author(s): A. Mase, Y. Kogi, T. Maruyama, T. Tokuzawa, M. Kunugita, T. Koike, and H. Hasegawa
  • Journal Title: Progress In Electromagnetics Research M Volume: 90 Pages: 81-88
  • DOI: 10.2528/pierm20010103
  • Peer Reviewed / Open Access
• [Journal Article] Non-contact and real-time measurement of heart rate and heart rate variability using microwave reflectometry (2020)
  • Author(s): A. Mase, Y. Kogi, T. Maruyama, T. Tokuzawa, F. Sakai, M. Kunugita, T. Koike, H. Hasegawa
  • Journal Title: Review of Scientific Instruments Volume: 91 Issue: 1 Pages: 014704-014704
  • DOI: 10.1063/1.5128959
  • NAID: 120007180025
  • Peer Reviewed
• [Journal Article] Isotope effects on energy, particle transport and turbulence in electron cyclotron resonant heating plasma of the Large Helical Device (2019)
  • Author(s): K. Tanaka, Y. Ohtani, M. Nakata, F. Warmer, T. Tsujimura, Y. Takemura, T. Kinoshita, H. Takahashi, M. Yokoyama, R. Seki, H. Igami, Y. Yoshimura, S. Kubo, T. Shimozuma, T. Tokuzawa, T. Akiyama, I. Yamada, R. Yasuhara, H. Funaba, M. Yoshinuma, K. Ida, M. Goto, et al
  • Journal Title: Nuclear Fusion Volume: 59 Issue: 12 Pages: 126040-126040
  • DOI: 10.1088/1741-4326/ab4237
  • NAID: 120007126859
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Isotope effect on energy confinement time and thermal transport in neutral-beam-heated stellarator-heliotron plasmas (2019)
  • Author(s): H. Yamada, K. Tanaka, R. Seki, C. Suzuki, K. Ida, K. Fujii, M. Goto, S. Murakami, M. Osakabe, T. Tokuzawa, M. Yokoyama, M. Yoshinuma
  • Journal Title: Physical Review Letters Volume: 123 Issue: 18 Pages: 185001-185001
  • DOI: 10.1103/physrevlett.123.185001
  • Peer Reviewed
• [Journal Article] Impact of a resonant magnetic perturbation field on impurity radiation, divertor footprint, and core plasma transport in attached and detached plasmas in the Large Helical Device (2019)
  • Author(s): M. Kobayashi, R. Seki, S. Masuzaki, S. Morita, H.M. Zhang, Y. Narushima, H. Tanaka, K. Tanaka, T. Tokuzawa, M. Yokoyama, T. Ido, I. Yamada, and the LHD Experimental group
  • Journal Title: Nuclear Fusion Volume: 59 Issue: 10 Pages: 109601-109601
  • DOI: 10.1088/1741-4326/ab3a13
  • NAID: 120007116720
  • Peer Reviewed
• [Journal Article] Spatial structure of low-frequency fluctuations throughout the transition of poloidal flow velocity in edge plasmas of LHD (2019)
  • Author(s): Moon C.、Kobayashi T.、Ida K.、Tokuzawa T.、Hidalgo C.、Yoshinuma M.、Ogawa K.、Itoh K.、Fujisawa A.、and LHD Experiment Group
  • Journal Title: Physics of Plasmas Volume: 26 Issue: 9 Pages: 092302-092302
  • DOI: 10.1063/1.5098954
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Microwave frequency comb Doppler reflectometer applying fast digital data acquisition system in LHD (2018)
  • Author(s): Tokuzawa T.、Tsuchiya H.、Tsujimura T.、Emoto M.、Nakanishi H.、Inagaki S.、Ida K.、Yamada H.、Ejiri A.、Watanabe K. Y.、Oguri K.、Akiyama T.、Tanaka K.、Yamada I.、LHD Experiment Group
  • Journal Title: Review of Scientific Instruments Volume: 89 Issue: 10
  • DOI: 10.1063/1.5035118
  • NAID: 120007029204
  • Peer Reviewed
• [Journal Article] Developments of Millimeter Wave Backscattering Systems for Fusion Plasma Turbulence Measurements (2018)
  • Author(s): T. Tokuzawa, K. Oguri, S. Kubo, K. Tanaka, H. Yamada, K. Y. Watanabe, A. Ejiri, S. Inagaki, J. Kohagura, T. Saito, and LHD Experiment Group
  • Journal Title: Proceedings of 43rd International Conference on Infrared, Millimeter, and Terahertz Waves
• [Presentation] 流れベクトル量測定のためのマイクロ波センシング技術の開発 (2020)
  • Author(s): 徳沢季彦
  • Organizer: 応用力学研究所研究集会“波・流れ・乱流のセンシング・マイニング・モデリング”
• [Presentation] Dual-Comb Microwave Doppler Reflectometer System in LHD and Feasibility Study for a JT-60SA Doppler Reflectometer (2019)
  • Author(s): T. Tokuzawa, S. Inagaki, A. Ejiri, H. Idei, R. Imazawa, N. Oyama, M. Yoshida, K. Tanaka1, H. Tsuchiya, K. Ida, K. Y. Watanabe, and H. Yamada
  • Organizer: 14th International Reflectometry Workshop (IRW14)
  • Int'l Joint Research
• [Presentation] Feasibility study of Doppler Reflectometry (2019)
  • Author(s): T. Tokuzawa, S. Inagaki, H. Idei, A. Ejiri, R. Imazawa, N. Oyama, M. Yoshida, H. Tsuchiya, and K. Tanaka
  • Organizer: 8th JT-60SA Research Coordination Meeting (RCM-8)
  • Int'l Joint Research
• [Presentation] Study of isotope effects from the viewpoint of turbulence observation in LHD (2019)
  • Author(s): T. Tokuzawa, K. Tanaka, H. Yamada, S. Inagaki, K. Ida, M. Nakata, T. Tsujimura, M. Yoshinuma, K. Y. Watanabe, H. Tsuchiya, A. Ejiri, and LHD Experiment Group
  • Organizer: 22nd International Stellarator & Heliotron Workshop 2019
  • Int'l Joint Research / Invited
• [Presentation] Observation of turbulence response in detach transition and similarity to H-mode transition in LHD (2019)
  • Author(s): T. Tokuzawa, M. Kobayashi, S. Masuzaki, S. Inagaki, K. Ida, H. Tsuchiya, H. Yamada, K. Y. Watanabe, K. Tanaka, I. Yamada, and LHD Experiment Group
  • Organizer: 17th International Workshop on H-mode Physics and Transport Barriers
  • Int'l Joint Research
• [Presentation] プラズマ乱流計測から見た水素同位体効果検証実験 (2019)
  • Author(s): T. Tokuzawa, K. Tanaka, H. Yamada, S. Inagaki, K. Ida, M. Nakata, T. Tsujimura, M. Yoshinuma, K. Y. Watanabe, H. Tsuchiya, A. Ejiri, and LHD Experiment Group
  • Organizer: 日本物理学会2019年秋季大会
  • Invited
• [Presentation] ミリ波後方散乱計測によるLHDプラズマ微視的乱流揺動計測 (2019)
  • Author(s): T. Tokuzawa、K. Tanaka, H. Yamada, S. Inagaki, K. Ida, M. Nakata, T. Tsujimura, M. Yoshinuma, K. Y. Watanabe, H. Tsuchiya, A. Ejiri, and LHD Experiment Group
  • Organizer: 閉じ込め輸送研究会2019
• [Presentation] Developments of sub-THz wave camera and application for plasma diagnostics (2019)
  • Author(s): T. Tokuzawa, A. Tanabe, T. Tsujimura, S. Kubo, H. Tsuchiya, K. Yamamoto, T. Saito, M. Tani, and H. Kitahara
  • Organizer: The 7th International Workshop on Far-Infrared Technologies
  • Int'l Joint Research
• [Presentation] Microwave frequency comb Doppler reflectometer applying fast digital data acquisition system in LHD (2018)
  • Author(s): T. Tokuzawa, H. Tsuchiya, T. Tsujimura, M. Emoto, H. Nakanishi, S. Inagaki, K. Ida, H. Yamada, A. Ejiri, K. Y. Watanabe, K. Oguri, T. Akiyama, K. Tanaka, I. Yamada, and LHD Experiment Group
  • Organizer: 22nd Topical Conference on High Temperature Plasma Diagnostics (HTPD2018)
  • Int'l Joint Research
• [Presentation] Turbulence rapid reduction in the stable detached LHD plasma with magnetic perturbation application (2018)
  • Author(s): T. Tokuzawa, M. Kobayashi, S. Masuzaki, S. Inagaki, K. Ida, H. Tsuchiya, H. Yamada, K. Y. Watanabe, K. Oguri, K. Tanaka, I. Yamada, and LHD Experiment Group
  • Organizer: 8th Asia-Pacific Transport Working Group (APTWG) International Conference
  • Int'l Joint Research
• [Presentation] Developments of Millimeter Wave Backscattering Systems for Fusion Plasma Turbulence Measurements (2018)
  • Author(s): T. Tokuzawa, K. Oguri, S. Kubo, K. Tanaka, H. Yamada, K. Y. Watanabe, A. Ejiri, S. Inagaki, J. Kohagura, T. Saito, and LHD Experiment Group
  • Organizer: 43rd International Conference on Infrared, Millimeter, and Terahertz Waves
  • Int'l Joint Research
• [Presentation] Rapid Radial Propagation of Momentum Change and Flow Oscillation Associated with the Pellet Injection (2018)
  • Author(s): T. Tokuzawa, S. Inagaki, N. Tamura, R. Sakamoto, K. Ida, T. Tsujimura, M. Emoto, C. Suzuki, H. Tsuchiya, A. Ejiri, H. Yamada, K. Y. Watanabe, K. Oguri, K. Tanaka, G. Motijima, I. Yamada, and LHD Experiment Group
  • Organizer: 27th IAEA Fusion Energy Conference
  • Int'l Joint Research
• [Presentation] Observation of damped oscillating flow and momentum change associated with a pellet injection (2018)
  • Author(s): T. Tokuzawa, S. Inagaki, N. Tamura, R. Sakamoto, K. Ida, T. Tsujimura, M. Emoto, C. Suzuki, H. Tsuchiya, A. Ejiri, H. Yamada, K. Y. Watanabe, K. Oguri, K. Tanaka, G. Motojima, I. Yamada, and the LHD Experiment Group
  • Organizer: Observation of damped oscillating flow and momentum change associated with a pellet injection
  • Int'l Joint Research
• [Presentation] Microwave comb reflectometry for micro turbulence measurements (2017)
  • Author(s): T. Tokuzawa, S. Inagaki, N. Tamura, R. Sakamoto, K. Ida, H. Tsuchiya, A. Ejiri, H. Yamadaa,c, K.Y. Watanabe, T. Akiyama, K. Tanaka, H. Nakanishi and I. Yamada
  • Organizer: 18th International Symposium on Laser-Aided Plasma Diagnostics
  • Int'l Joint Research / Invited
• [Presentation] Fast Radial Propagation of Momentum Associated with the TESPEL Injection (2017)
  • Author(s): T. Tokuzawa, S. Inagaki, N. Tamura, R. Sakamoto, K. Ida, H. Tsuchiya, A. Ejiri, H. Yamada, K.Y. Watanabe, K. Tanaka, T. Akiyama, and I. Yamada
  • Organizer: 21st International Stellarator-Heliotron Workshop
  • Int'l Joint Research
• [Presentation] Rapid momentum propagation associated with the TESPEL injection (2017)
  • Author(s): T. Tokuzawa, S. Inagaki, N. Tamura, R. Sakamoto, K. Ida, A. Ejiri, H. Yamada, K. Y. Watanabe, I. Yamada , and LHD Experiment Group
  • Organizer: Plasma Conference 2017
  • Int'l Joint Research
• [Remarks] 卵が先かニワトリが先か －乱流発生・抑制の因果律を調べる－
  • URL: http://www.nifs.ac.jp/lhdreport/mailinfo_303.html
• [Remarks] 千々に乱れる流れの構造を櫛を使って測定する －周波数コムを用いた計測器の開発－
  • URL: http://www.nifs.ac.jp/lhdreport/mailinfo_296.html