Research and development of a dielectric laser acceleration technique using far-infrared light.

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18636
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Satoh Daisuke 国立研究開発法人産業技術総合研究所, 計量標準総合センター, 研究員 (40780086)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: レーザー誘電体加速 / 遠赤外光 / フェムト秒光加工

Outline of Final Research Achievements

To realize an ultra-compact, high-energy electron linear accelerator with high acceleration efficiency, we have promoted the development of a dielectric laser acceleration technique using the optical electric field of far-infrared light. In this study, we devised a new dielectric laser acceleration structure called a dielectric coaxial taper structure, which can be applied to electron acceleration in the energy range from the low-β to the speed of light with an axisymmetric acceleration mode. By applying femtosecond laser processing technology to the fabrication of dielectric accelerating structures, we have succeeded in fabricating the dielectric periodic structures at far-infrared wavelength for a few tens of cycles in about a few 10 minutes. Finally, the beamline design and development of beamline components suitable for test bench of the dielectric laser acceleration were completed.

Free Research Field

加速器科学

Academic Significance and Societal Importance of the Research Achievements

本研究により、高効率発生が可能な遠赤外光を用いたレーザー誘電体加速によって、軸対称の加速モードで低速領域から光速までのエネルギー領域の電子加速に適用できる可能性が示され、オンチップサイズの超小型かつ高効率の高エネルギー電子加速器の実現への大きな一歩であり、基礎科学分野並びに産業界まで幅広い分野に大きな影響を与えるものである。