Development of highly stable deformable mirrors for extreme focusing of X-ray free-electron lasers.

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K20407
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
• Research Institution: Nagoya University
• Principal Investigator: Inoue Takato 名古屋大学, 工学研究科, 助教 (40966777)
• Project Period (FY): 2022-08-31 – 2024-03-31
• Keywords: X線自由電子レーザー / X線ミラー / 形状可変ミラー / 圧電素子

Outline of Final Research Achievements

In this study, a deformable mirror was developed to create a system capable of focusing an X-ray free-electron laser with high stability. Piezoelectric-driven deformable mirrors are commonly used in the X-ray region. To increase the deformation in response to an applied voltage, we implemented a bonding structure using metal junctions, successfully enhancing the amount of deformation. Additionally, a thin-plate bonding structure was devised to achieve finer deformation shapes. This structure was successfully fabricated using silver nanopaste, and the deformable mirror exhibited successful deformation in an X-ray beamline.

Free Research Field

X線光学

Academic Significance and Societal Importance of the Research Achievements

X線自由電子レーザー（XFEL）を利用することで，試料の真の非破壊観察や，X線非線形光学の開拓が期待されている．これらを実現するためには，XFELを高い安定性の下，小さく高密度に集光する必要がある．すなわち，高い形状精度と安定性を有するＸ線集光素子が不可欠であり，本研究で開発する形状可変ミラーはそれらを満足する．