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Design of axisymmetric multi-mirror grazing incidence system to increase the numerical aperture of neutron and X-ray microscopes

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Abstract

An axisymmetric multi-mirror system for neutron and X-ray microscopes is proposed to increase their numerical aperture and collection efficiency. A Wolter type-I mirror is used as the basis of the multi-mirror system at grazing incidence. The addition of an even number of hyperboloid mirrors to the Wolter type-I mirror can satisfy both an equal optical path length and Abbe’s sine condition. The numerical aperture increases in proportion to the number of mirrors. The optical parameters of the system with four tandem mirrors are calculated for neutrons and X-rays with a wavelength of 0.4 nm by assuming that the average grazing angle of incidence is 5.4 mrad and the magnification is 10. The inner diameters of the mirrors are limited to <10 mm considering the total length of the optical system. Tolerance of off-axis distance was calculated using a ray-tracing computer simulation. Ray tracing shows that a blur size <14 nm will be possible at an off-axis displacement of 10 μm.

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Acknowledgments

This work was supported by Grant-in-Aid for Scientific Research (No. 25108003) from the Ministry of Education, Culture, Sports, Science and Technology and Grant-in-Aid for Scientific Research (No. 23656056) from the Japan Society for the Promotion of Science.

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  1. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan

    Sadao Aoki, Norio Watanabe, Hiroshi Asami & Akihiro Shimada

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  1. Sadao Aoki
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  2. Norio Watanabe
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  3. Hiroshi Asami
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  4. Akihiro Shimada
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Correspondence to Sadao Aoki.

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Aoki, S., Watanabe, N., Asami, H. et al. Design of axisymmetric multi-mirror grazing incidence system to increase the numerical aperture of neutron and X-ray microscopes. Opt Rev 23, 161–171 (2016). https://doi.org/10.1007/s10043-016-0191-0

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  • DOI: https://doi.org/10.1007/s10043-016-0191-0

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