Development of microwave undulator for fast polarization switching

• Project/Area Number: 15K13401
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Quantum beam science
• Research Institution: Tohoku University
• Principal Investigator: Kashiwagi Shigeru 東北大学, 電子光理学研究センター, 准教授 (60329133)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000); Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 偏光 / マイクロ波 / 加速器 / テラヘルツ波 / アンジュレータ / テラヘルツ / 電子加速器 / 電子ビーム

Outline of Final Research Achievements

We developed a microwave undulator that can manipulate the polarization state of radiation at high speed. We designed the microwave undulator cavity that can excite two mode of electromagnetic fields for making the oscillation motion of electron beam in both the horizontal and vertical directions. The cold model of the undulator was manufactured and the electromagnetic field distribution was measured by the bead perturbation method. The electron beam trajectory was evaluated from the measured electromagnetic field distribution in the undulator cavity. We have developed a novel polarization control method that makes use of the coherence of an undulator radiation emitted from a very short electron beam. The principle of this polarization control method in THz region was demonstrated using 5 MeV electron beam and 10-periods undulator.

Academic Significance and Societal Importance of the Research Achievements

電磁波の重要な特性の一つである偏光を操作することによって、様々な機能材料の研究開発がなされてきた。現在、THz波領域においては、広帯域で使用可能な光学素子の開発が遅れており、偏光を自由に操作できる光源の開発が待たれている。本研究で開発した高速偏光スイッチ可能なマイクロ波アンジュレータやコヒーレントアンジュレータ放射の偏光操作技術をテラヘルツ波発生に応用することによって、高速通信に用いられる光デバイス開発を飛躍的に進展させることができる。また、生体科学分野においても偏光制御可能なTHz光源は、タンパク質の立体構造を調べるのに極めて有用である。

Research Products

• [Journal Article] Observation of coherent undulator radiation in THz region (2018)
  • Author(s): Kashiwagi Shigeru、Abe Taro、Saito Hirotoshi、Hinode Fujio、Kanomata Ken、Miura Sadao、Muto Toshiya、Nagasawa Ikuro、Nanbu Ken-ichi、Ninomiya Shingo、Nishimori Nobuyuki、Saito Yuki、Takahashi Ken、Hama Hiroyuki
  • Journal Title: Infrared Physics & Technology Volume: 93 Pages: 335-339
  • DOI: 10.1016/j.infrared.2018.08.011
  • Peer Reviewed
• [Journal Article] Generation of coherent THz radiation with wide/narrow bandwidth by an extremely short electron beam at t-ACTS, Tohoku University (2017)
  • Author(s): Shigeru Kashiwagi, Ken Kanomata, Hirotoshi Saito, Yuki Saito, Ken Takahashi, Ikuro Nagasawa, Kenichi Nanbu, Nobuyuki Nishimori, Fujio Hinode, Sadao Miura, Toshiya Muto, Hiroyuki Hama
  • Journal Title: Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan Volume: － Pages: 122-125
  • Open Access
• [Journal Article] Development of a very short period undulator and observation of the first light (2017)
  • Author(s): Shigeru Yamamoto, Hiroyuki Hama, Shigeru Kashiwagi, Fujio Hinode, Toshiya Muto, Kenichi Nanbu
  • Journal Title: Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan Volume: － Pages: 216-220
  • Open Access
• [Journal Article] A study of generation of variable polarized THz superradiance using a crossed undulator (2017)
  • Author(s): Hirotoshi Saito, Shigeru Kashiwagi, Fujio Hinode, Sadao Miura, Nobuyuki Nishimori, Toshiya Muto,Kenichi Nanbu, Yoshinobu Shibasaki, Ken Takahashi, Ikuro Nagasawa, Ken Kanomata, Yuki Saito,Hiroyuki Hama
  • Journal Title: Proceedings of 14th Annual Meeting of Particle Accelerator Society of Japan Volume: － Pages: 817-820
  • Open Access
• [Presentation] テラヘルツコヒーレントアンジュレータ放射の偏光制御に関する研究 (2019)
  • Author(s): 柏木茂, 齊藤寛峻, 全炳俊, 入澤明典, 鹿又健, 森田希望, 高橋健, 長澤育郎, 南部健一, 二宮慎吾, 日出富士雄, 三浦禎雄, 武藤俊哉, 山田悠樹, 濱広幸
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 交叉型アンジュレータを用いた偏光可変コヒーレントTHz放射生成の研究 (2018)
  • Author(s): 齊藤寛峻, 柏木茂, 日出富士雄, 三浦禎雄, 西森信行, 武藤俊哉, 南部健一, 高橋健, 長澤育郎, 鹿又健, 齊藤悠樹, 二宮慎吾, 濱広幸
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Observation of coherent undulator radiation in THz region (2017)
  • Author(s): S. Kashiwagi, H. Saito, F. Hinode, K. Kanomata, S. Miura, T. Muto, I. Nagasawa, N. Nishimori, K. Nanbu, Y. Saito, K. Takahashi and H. Hama
  • Organizer: The 9th International Workshop on Infrared Microscopy and Spectroscopy with Accelerator Based Sources, WIRMS 2017
  • Int'l Joint Research
• [Presentation] 交叉型アンジュレータを用いた偏光可変コヒーレントTHz放射生成の研究 (2017)
  • Author(s): 齊藤 寛峻、柏木茂、日出富士雄、三浦禎雄、西森信行、武藤俊哉、南部健一、髙橋健、長澤育郎、鹿又健、齊藤悠樹、二宮慎吾、濱広幸
  • Organizer: ビーム物理研究会2017
• [Presentation] Generation of Coherent Undulator Radiation at ELPH, Tohoku University (2016)
  • Author(s): S. Kashiwagi, Taro Abe,, Fujio Hinode, Toshiya Muto, Ikurou Nagasawa, Ken-ichi Nanbu, Hirotoshi Saito, Yuki Saito, Yoshinobu Shibasaki, Ken Takahashi and Hiroyuki Hama
  • Organizer: 28th Linear Accelerator Conference (LINAC 16)
  • Place of Presentation: Michigan State University, MI, USA
  • Year and Date: 2016-09-27
  • Int'l Joint Research
• [Presentation] 極短電子ビームを用いたコヒーレントアンジュレータ放射光発生に関する研究 (2016)
  • Author(s): 柏木茂, 日出富士雄, 武藤俊哉, 南部健一, 齊藤寛峻, 阿部太郎, 高橋健, 長澤育郎, 東谷千比呂, 柴崎義信, 濱広幸
  • Organizer: 日本物理学会 第71回年次大会
  • Place of Presentation: 東北学院大学泉キャンパス（宮城県仙台市）
  • Year and Date: 2016-03-22