SPring-8, the large synchrotron radiation facility

　A collaborative research group led by Takahisa Koyama (Senior Scientist), Hirokatsu Yumoto (Senior Scientist), and Haruhiko Ohashi (Director) of the Beamline Division, Japan Synchrotron Radiation Research Institute (JASRI), and Makina Yabashi (Group Director) of the SACLA Beam Line Research and Development Group, RIKEN SPring-8 Center, has developed multilayer focusing mirrors (reflecting mirrors) that focus high-energy X-rays of 100 keV into a sub-micrometer range at the BL05XU beamline of a large synchrotron radiation facility, SPring-8.

　One of the features of SPring-8 is the availability of bright high-energy X-rays. Internal structures of thick metal samples can be observed in detail if high-energy X-rays are focused into small beams. However, there has been no high-throughput optical element that can focus high-energy X-rays into small beams.

　The research group developed high-throughput multilayer focusing mirrors and succeeded in effectively focusing high-energy X-rays into a sub-micrometer range. The focused beams realized in this research have been already used in the observation of the internal structures of devices enclosed in metal cases and the local structures of thick steel materials.

　Their research achievements were published in the online version of an international scientific journal, the Journal of Synchrotron Radiation, on Thursday, 22 February 2024.

【Publication】
　Title: Sub-micrometer focusing of intense 100 keV X-rays with multilayer reflective optics
　Authors: Takahisa Koyama, Hirokatsu Yumoto, Takanori Miura, Yasuhisa Matsuzaki, Makina Yabashia and Haruhiko Ohashia
　Journal: Journal of Synchrotron Radiation
　DOI: 10.1107/S1600577524000213