Development of precision Wolter mirrors for future soft x-ray observations of the Sun

Taro Sakao; Sota Kashima; Satoshi Matsuyama; Takato Inoue; Haruhito Iriyama; Shinnosuke Kurimoto; Kazuto Yamauchi; Yoshiki Kohmura; Akira Miyake; Hiroki Nakamori; Shunichiro Matsuzaka; Toshiki Taniguchi; Toshio Nakano; Noriyuki Narukage

doi:10.1117/12.3019393

21 August 2024 Development of precision Wolter mirrors for future soft x-ray observations of the Sun

Taro Sakao, Sota Kashima, Satoshi Matsuyama, Takato Inoue, Haruhito Iriyama, Shinnosuke Kurimoto, Kazuto Yamauchi, Yoshiki Kohmura, Akira Miyake, Hiroki Nakamori, Shunichiro Matsuzaka, Toshiki Taniguchi, Toshio Nakano, Noriyuki Narukage

Author Affiliations +

Proceedings Volume 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray; 1309353 (2024) https://doi.org/10.1117/12.3019393
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

X-ray imagery of the solar corona with arcsecond-level angular resolution is a key to understand various activities of hot plasmas in the corona. We report our development activities of precision Wolter mirrors for future soft X-ray imaging observations of the Sun. The Wolter mirrors under development are fabricated by direct polishing of glass-ceramic substrates. We fabricated an engineering Wolter mirror of 3-m focal length whose mirror area was 40 mm x 50 mm (along optical-axis and cylindrical directions, respectively) for each of the parabola and hyperbola sections using EEM (Elastic Emission Machining) precision polishing technology. X-ray imaging performance of the mirror was then evaluated with 8-keV parallel X-rays at SPring-8/BL29XUL. For the mirror area whose tilt up to >6 degrees along the cylindrical direction, the mirror showed imaging performance of ~0.25 arcsec FWHM (~0.55 arcsec HPD) with the scattering level ~1 × 10-4 of the PSF peak at 30-arcsec off-axis position.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Taro Sakao, Sota Kashima, Satoshi Matsuyama, Takato Inoue, Haruhito Iriyama, Shinnosuke Kurimoto, Kazuto Yamauchi, Yoshiki Kohmura, Akira Miyake, Hiroki Nakamori, Shunichiro Matsuzaka, Toshiki Taniguchi, Toshio Nakano, and Noriyuki Narukage "Development of precision Wolter mirrors for future soft x-ray observations of the Sun", Proc. SPIE 13093, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray, 1309353 (21 August 2024); https://doi.org/10.1117/12.3019393

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