High power terahertz vector beam by diffraction radiation

• Project/Area Number: 18H03473
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 80040:Quantum beam science-related
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: Honda Yosuke 大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 助教 (40509783)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000); Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2018: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
• Keywords: テラヘルツ / 電子加速器 / レーザー / ベクトルビーム / 超伝導加速器 / 電子ビーム / 回折放射

Outline of Final Research Achievements

The technologies of the light source in the spectrum range of around 1 THz have not been established. The modern electron accelerators have a possibility to be a high power terahertz source. We have developed a terahertz source based on coherent diffraction radiation mechanism at compact ERL test accelerator.
We have established the beam tuning to realize short bunch beam for efficiently produce coherent radiation in the terahertz range, and to path the beam through a hole mirror target which is the source of the diffraction radiation. The radiation was transported through a newly built vacuum transport line to the experimental room located outside of the accelerator. The spatial profile of the terahertz radiation was measured. The characteristic donuts shape and radial polarization were confirmed by the measurement. It shows efficient transport of the accelerator based terahertz radiation for application experiments.

Academic Significance and Societal Importance of the Research Achievements

テラヘルツ光と呼ばれる、周波数1THz付近の領域は、身近な多くの現象の基本的なエネルギースケールである。例えば、分子構造の振動や回転モードのエネルギー準位に対応し、その励起、脱励起はテラヘルツ光を伴う。テラヘルツ光を照射して、これらのモードを選択的に励起することにより、熱平衡状態では実現しない物質の新たな機能を見いだすことが出来る。
テラヘルツ光領域では強度はもちろん、特徴的な光源が少ない。回折放射は偏光特性が空間的に特徴を持つベクトルビームと呼ばれる光の一種である。テラヘルツの領域の特徴的な光源として、応用可能性が拡がる。さらに、本方式は連続運転超伝導加速器により大強度化の可能性もある。

Research Products

• [Journal Article] High-efficiency broadband THz emission via diffraction-radiation cavity (2019)
  • Author(s): Y. Honda, M. Shimada, A. Aryshev, R. Kato, T. Miyajima, T. Obina, R. Takai, T. Uchiyama, N. Yamamoto
  • Journal Title: Physical Review Accelerator and Beams Volume: 22 Issue: 4 Pages: 040703-040703
  • DOI: 10.1103/physrevaccelbeams.22.040703
  • Peer Reviewed / Open Access
• [Journal Article] Stimulated emission of THz coherent diffraction radiation in an optical cavity by a multibunch electron beam (2019)
  • Author(s): Y. Honda, A. Aryshev, R. Kato, T. Miyajima, T. Obina, M. Shimada, R. Takai, T. Uchiyama, N. Yamamoto
  • Journal Title: Journal of Physics: Conf. Series Volume: 1350 Issue: 1 Pages: 012038-012038
  • DOI: 10.1088/1742-6596/1350/1/012038
  • Peer Reviewed / Open Access
• [Journal Article] Stimulated excitation of an optical cavity by a multibunch electron beam via coherent diffraction radiation process (2018)
  • Author(s): Y.Honda, M.Shimada, A.Aryshev, R.Kato, T.Miyajima, T.Obina, R.Takai, T.Uchiyama, N.Yamamoto
  • Journal Title: Phys. Rev. Lett. Volume: 121 Issue: 18 Pages: 184801-184801
  • DOI: 10.1103/physrevlett.121.184801
  • Peer Reviewed / Open Access
• [Presentation] cERLにおける テラヘルツ光源の開発 (2020)
  • Author(s): 本田洋介
  • Organizer: 日本加速器学会
• [Presentation] 共振器型誘導回折放射における共振器設計の比較 (2019)
  • Author(s): Y.Honda
  • Organizer: 日本加速器学会年会
• [Presentation] cERLにおけるCDRテラヘルツビームラインの製作 (2019)
  • Author(s): Y.Honda
  • Organizer: 日本加速器学会年会
• [Presentation] Stimulated Emission of THz Coherent Radiation in an Optical Cavity by a Multibunch Electron beam (2019)
  • Author(s): Y.Honda
  • Organizer: International Particle Accelerator Conference
  • Int'l Joint Research
• [Presentation] THz source development at KEK ERL (2019)
  • Author(s): Y.Honda
  • Organizer: SPECTROSCOPY AND IMAGING WITH THZ RADIATION USING ULTIMATE RADIATION SOURCES
  • Invited
• [Presentation] High-Efficiency Broadband THz Emission via Diffraction-Radiation Cavity (2019)
  • Author(s): Miho Shimada
  • Organizer: Energy Recovery Linac 2019
  • Int'l Joint Research / Invited
• [Presentation] Stimulated Emission of THz Coherent Diffraction Radiation (2019)
  • Author(s): Y. Honda
  • Organizer: International Free Electron Laser Conference
  • Int'l Joint Research
• [Presentation] コンパクトERLにおけるCDRテラヘルツビームライン (2019)
  • Author(s): Y.Honda
  • Organizer: 放射光学会
• [Presentation] 共振器型回折放射による広帯域テラヘルツ放射発生 (2019)
  • Author(s): Y.Honda
  • Organizer: 物理学会
• [Presentation] 共振器型回折放射による広帯域テラヘルツ自由電子レーザーの発振 (2018)
  • Author(s): Y.Honda
  • Organizer: 日本加速器学会年会
• [Presentation] cERLにおけるCDRテラヘルツビームラインの計画 (2018)
  • Author(s): Y.Honda
  • Organizer: 日本加速器学会年会
• [Presentation] Observation of Resonant Stimulated Radiation from a Multi-bunch Electron Beam Passing Through an Optical Cavity (2018)
  • Author(s): Y.Honda
  • Organizer: LINAC2018
  • Int'l Joint Research / Invited
• [Remarks] KEK超伝導加速器利用推進チーム
  • URL: http://pfwww.kek.jp/ERLoffice/