Visualization of millimeter-wave power profiles in a corrugated waveguide and improvemtnt of transmission efficiency basing on the mode-analyses of transmitted waves

• Project/Area Number: 16K06940
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Shimozuma Takashi 核融合科学研究所, ヘリカル研究部, 教授 (80270487)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: 核融合 / プラズマ加熱 / 大電力ミリ波 / ジャイロトロン / コルゲート導波管 / 伝搬モード分析 / マイターベンド / ペルチェ素子 / モード分析 / フィードバック制御 / プラズマ・核融合 / プラズマ対向機器・加熱機器 / 電子サイクロトロン共鳴加熱

Outline of Final Research Achievements

A power profile monitor of propagating millimeter-waves in an evacuated corrogated waveguide was developed. It consists of a miter-bend reflector and two-dimensional Peltier device array which is attached on the atmospheric side of the mitierbend reflector. The information of surface temperature of a miterbend mirror can be obtained from the voltage change of each Peltier device which is connected in series and operated with constant current. The temperature information can be obtained from a voltage change of each device. The miterbend mirror can be coold at the same time. A method of mode analysis is proposed using the voltage change of each Peltier device. Several examples of the mode analyses are given using the artificiallly synthesized signals of Peltier devices and the possible problems are pointed out.

Academic Significance and Societal Importance of the Research Achievements

将来の核融合発電炉において持続的な発電を達成するためには、水素プラズマを１億度以上まで加熱する必要がある。大きなパワーを持つ高周波数の電磁波（ミリ波）を用いるプラズマの加熱方法では、ミリ波発生装置を核融合炉から十分離れた場所に設置できる利点がある。本研究は、大電力のミリ波を核融合炉から十分離れた場所から低損失で伝送できるコルゲート導波管で、パワー減衰の小さいガウス分布の電界分布を保ったまま100メートル以上伝送するために、導波管系を精密に設置、調整でき、真空化された伝送系内を伝搬するミリ波の状態をほぼリアルタイムで計測できるモニターシステムと伝搬モード分析法を構築することにある。

Research Products

• [Journal Article] Effect of Electron Cyclotron Current Drive on the Ion Temperature in the Plasma Core Region of the Large Helical Device (2018)
  • Author(s): YOSHIMURA Yasuo、EJIRI Akira、SEKI Ryosuke、SAKAMOTO Ryuichi、NAGAOKA Kenichi、SHIMOZUMA Takashi、IGAMI Hiroe、TAKAHASHI Hiromi、TSUJIMURA Toru I.、WARMER Felix、YANAGIHARA Kota、GOTO Yuki、IDA Katsumi、YOSHINUMA Mikiro、KOBAYASHI Tatsuya、KUBO Shin、OSAKABE Masaki、MORISAKI Tomohiro、the LHD Experiment Group
  • Journal Title: Plasma and Fusion Research Volume: 13 Issue: 0 Pages: 1402124-1402124
  • DOI: 10.1585/pfr.13.1402124
  • NAID: 130007543160
  • ISSN: 1880-6821
  • Year and Date: 2018-12-20
  • Peer Reviewed / Open Access
• [Journal Article] Analysis Technique of Millimeter-Wave Propagating Modes in an Oversized Corrugated Waveguide Using Developed Beam Profile Monitors (2018)
  • Author(s): SHIMOZUMA Takashi、KOBAYASHI Sakuji、ITO Satoshi、OKADA Kohta、ITO Yasuhiko、YOSHIMURA Yasuo、IGAMI Hiroe、TAKAHASHI Hiromi、TSUJIMURA Toru、MIZUNO Yoshinori、KUBO Shin
  • Journal Title: Plasma and Fusion Research Volume: 13 Issue: 0 Pages: 3405036-3405036
  • DOI: 10.1585/pfr.13.3405036
  • NAID: 130007404693
  • ISSN: 1880-6821
  • Year and Date: 2018-05-10
  • Peer Reviewed / Open Access
• [Journal Article] Real-time control of electron cyclotron wave polarization in the LHD (2018)
  • Author(s): Ii Tsujimura T.、Mizuno Y.、Tokuzawa T.、Ito Y.、Kubo S.、Shimozuma T.、Yoshimura Y.、Igami H.、Takahashi H.、Ejiri A.
  • Journal Title: Fusion Engineering and Design Volume: 131 Pages: 130-134
  • DOI: 10.1016/j.fusengdes.2018.04.062
  • NAID: 120007180021
  • Peer Reviewed
• [Journal Article] Development of 300 GHz Band Gyrotron for Collective Thomson Scattering Diagnostics in the Large Helical Device (2017)
  • Author(s): Teruo SAITO, Yuusuke YAMAGUCHI, Yoshinori TATEMATSU, Masafumi FUKUNARI, Takumi HIROBE, Shunsuke TANAKA, Ryuji SHINBAYASHI, Takashi SHIMOZUMA, Shin KUBO, Kenji TANAKA and Masaki NISHIURA
  • Journal Title: Plasma and Fusion Research Volume: 12 Issue: 0 Pages: 1206013-1206013
  • DOI: 10.1585/pfr.12.1206013
  • NAID: 130006897721
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Development of over-MW gyrotrons for fusion at 14 GHz to sub-THz frequencies (2017)
  • Author(s): T. Kariya, T. Imai, R. Minami, K. Sakamoto, Y. Oda, R. Ikeda, T. Shimozuma, S. Kubo, H. Idei, T. Numakura, K. Tsumura, Y. Ebashi, M. Okada, Y. Nakashima, Y. Yoshimura, H. Takahashi, S. Ito, K. Hanada, K. Nagasaki, M. Ono, T. Eguchi, Y. Mitsunaka
  • Journal Title: Nuclear Fusion Volume: 57 Issue: 6 Pages: 066001-066001
  • DOI: 10.1088/1741-4326/aa6875
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 核融合炉へ向けた大電力ジャイロトロンの開発 (2017)
  • Author(s): 假 家 強，今 井 剛，南 龍 太 郎，津 村 康 平，江 橋 優 斗，岡 田 麻 希， 中 嶋 洋 輔 ， 出 射 浩， 花 田 和 明， 下 妻 隆， 久 保 伸，小 田 靖 久， 池 田 亮 介， 坂 本 慶 司， 小 野 雅 之
  • Journal Title: J. Plasma Fusion Research Volume: 93 Pages: 146-149
  • Open Access
• [Journal Article] Comparison between Full Wave and Ray-Tracing Calculations to Examine Scenarios for Electron Bernstein Wave Heating in LHD (2016)
  • Author(s): H. Igami, A. Fukuyama, H. Idei, K. Nagasaki, Y. Goto, S. Kubo, T.Shimozuma, Y. Yoshimura, H. Takahashi, T. Tsujimura, R. Makino
  • Journal Title: Plasma and Fusion Research Volume: 11 Issue: 0 Pages: 2403098-2403098
  • DOI: 10.1585/pfr.11.2403098
  • NAID: 130005395268
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Experimental Study on W-Band (75 - 110 GHz) Oversized Surface Wave Oscillator Driven by Weakly Relativistic Electron Beams (2016)
  • Author(s): M. Thu San, K. Ogura, K. Yambe, Y. Annaka, S. Gong, J. Kawamura, T. Miura, S. Kubo, T. Shimozuma, S. Kobayashi, K. Okada.
  • Journal Title: Plasma and Fusion Research Volume: 11 Issue: 0 Pages: 2406085-2406085
  • DOI: 10.1585/pfr.11.2406085
  • NAID: 130005401653
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Presentation] Evaluation of collective Thomson scattering spectra in the LHD (2019)
  • Author(s): M. Nishiura, S. Kubo, K. Tanaka, M. Iizawa, N. Kenmochi, T. Shimozuma, H. Takahashi, T. Saito, LHD experiment group
  • Organizer: 第74回 日本物理学会(春)
• [Presentation] ECRHミリ波伝送系の伝送効率改善に向けたミリ波ビーム分布モニターの高性能化 (2018)
  • Author(s): T. Shimozuma, S. Kobayashi, S. Ito, Y. Ito, Y. Mizuno, Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, S. Kubo
  • Organizer: 35th プラズマ・核融合学会 年会
• [Presentation] LHDにおける電子サイクロトロン共鳴加熱の最適入射 (2018)
  • Author(s): 辻村 亨, 久保 伸, 下妻 隆, 吉村 泰夫, 伊神 弘恵, 高橋 裕己, 長壁 正樹
  • Organizer: 35th プラズマ・核融合学会 年会
• [Presentation] LHDにおける入射EC波の偏波のリアルタイム制御 (2018)
  • Author(s): T. Tsujimura, Y. Mizuno, T. Tokuzawa, Y. Ito, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, A. Ejiri, the LHD Experiment Group
  • Organizer: 第12回 核融合エネルギー連合講演
• [Presentation] Recent progress of the applications of ECRH/ECCD and the supportive technologies in the LHD (2018)
  • Author(s): H. Igami, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Takahashi, T. I. Tsujimura, S. Kobayashi, Y. Mizuno, H. Takubo, K. Tanaka, M. Yokoyama, R. Seki, I. Yamada, R. Yasuhara, H. Tsuchiya, K. Ida, M. Yoshinuma, T. Kobayashi, S. Ohdachi, M. Osakabe, T. Morisaki
  • Organizer: 20th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
  • Int'l Joint Research
• [Presentation] Attenuation of Hybrid Modes in Corrugated Waveguides at Frequencies above the Bragg Frequency (2017)
  • Author(s): K. Ohkubo1, T. Saito, Y. Yamaguchi1, Y. Tatematsu, J. Kasa, S. Kubo, T. Shimozuma, K. Tanaka,
  • Organizer: The 6th International Workshop on Far-Infrared Technologies (IW-FIRT 2017)
  • Place of Presentation: Fukui, Japan)
  • Year and Date: 2017-03-07
  • Int'l Joint Research
• [Presentation] Improvement of Millimeter-Wave Transmission Efficiency Using Beam Profile Monitors in an ECRH Transmission Line (2017)
  • Author(s): T. Shimozuma, S. Kobayashi, S.i Ito, Y. Ito, K. Okada, Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, Y. Mizuno, S. Kubo
  • Organizer: 26th International Toki Conference
  • Int'l Joint Research
• [Presentation] Heating Characteristics of the 3rd Harmonic ECRH Using 154 GHz Gyrotron Power (2017)
  • Author(s): T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, R. Makino, Ryuichi S., M.Osakab
  • Organizer: Plasma Conference 2017
  • Int'l Joint Research
• [Presentation] Effect of ECCD on the ion temperature at the plasma core region (2017)
  • Author(s): Y. Yoshimura, T. Shimozuma, H. Igami, H. Takahashi, T. I. Tsujimura, R. Makino, K. Yanagihara, Y. Goto, K. Ida, M. Yoshinuma, T. Kobayashi, K. Nagaoka, R. Sakamoto, S. Kubo, M. Osakabe, T. Morisaki
  • Organizer: International Stellarator/Heliotron Workshop
  • Int'l Joint Research
• [Presentation] Study of optimum injection of ECH for high electron temperature plasmas in the Large Helical Device (2017)
  • Author(s): T. Tsujimura, S. Kubo, T. Shimozuma, Y. Yoshimura, H. Igami, H. Takahashi, and R. Makino
  • Organizer: Topical Conference on Radio Frequency Power in Plasmas
  • Int'l Joint Research
• [Presentation] Current Status of the LHD ECRH System and Development of Dual-Frequency Gyrotrons (2017)
  • Author(s): T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, R. Makino, S. Ito, Y. Mizuno, H. Takubo, S. Kobayashi, R. Minami, T. Kariya , T. Imai
  • Organizer: 2017 US-EU-JPN Workshop on RF Heating Technology & 2017 US-JPN Workshop on RF Physics
  • Int'l Joint Research
• [Presentation] メガワット定常 ECH 伝送系における伝搬モード分析と それに基づく伝送効率の改善法の開発 (2016)
  • Author(s): 下妻 隆, 小林 策治, 伊藤 哲, 岡田 宏太, 伊藤 康彦, 吉村 泰夫, 伊神 弘恵, 高橋 裕己, 辻村 亨, 牧野 良平, 水野 嘉識, 久保 伸
  • 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] 核融合炉へ向けた大電力ジャイロトロンの開発研究 (2016)
  • Author(s): 假家強,今井剛,南龍太郎,津村康平,江橋優斗,中嶋洋輔,出射浩,花田和明,下妻隆,久保伸, 小田靖久,池田亮介,坂本慶司,小野雅之
  • 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] Development of Over MW Gyrotrons for Fusion at Frequencis from 14 GHz to Sub-terahert (2016)
  • Author(s): T. Kariya, T. Imai, R. Minami, T. Numakura, T. Shimozuma, S. Kubo, et.al.
  • Organizer: 26th IAEA Fusion Energy Conference (FEC 2016)
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] Transmission Test of 300 GHz Band Gyrotron Power by Corrugated Waveguides (2016)
  • Author(s): T. Saito, Y. Yamaguchi, Y. Tatematsu, T. Hirobe, J. Kasa, K. Ohkubo, S. Kubo, T. Shimozuma, K. Tanaka, and M. Nishiura
  • Organizer: IRMMW-THz 2016
  • Place of Presentation: Denmark,Copenhagen
  • Year and Date: 2016-09-25
  • Int'l Joint Research
• [Presentation] Present Status of the ECRH System in LHD and Development of a New Gyrotron and the Related Components (2016)
  • Author(s): T. Shimozuma, S. Kubo Y. Yoshimura, H. Igami, H. Takahashi, T. Tsujimura, R. Makino, S. Ito, Y. Mizuno, K. Okada, S. Kobayashi, R. Minami, T. Kariya and T. Imai
  • Organizer: Workshop on RF Heating Technology of Fusion Plasmas 2016 US-EU-JPN RF Heating Technology Workshop
  • Place of Presentation: Leinsweiler, Germany
  • Year and Date: 2016-09-21
  • Int'l Joint Research