Presentation
2 November 2016 Progress in precision Wolter mirrors for soft x-ray observations of the sun (Conference Presentation)
Taro Sakao, Satoshi Matsuyama, Takumi Goto, Kazuto Yamauchi, Yoshiki Kohmura, Yoshinori Suematsu, Noriyuki Narukage
Author Affiliations +
Abstract
High resolution imagery of solar X-ray corona provides a crucial key to understand dynamics and heating processes of plasmas there. However, imagery of the Sun with sub-arcsecond resolution in X-ray wavelengths has never been conducted due to severe technical difficulty in fabricating precision Wolter mirrors with a wide field of view exceeding several 100”. For future X-ray observations of the Sun, we are attempting to realize precision Wolter mirrors with sub-arcsecond resolution by adopting state-of-the-art surface polish and measurement methods to segmented mirrors which consist of a portion of an entire circle. Following evaluation of X-ray focusing performance of the first engineering Wolter mirror using BL29XUL coherent X-ray beam line at SPring-8 synchrotron facility, the second engineering mirror was fabricated with improvements in precision polish from the first mirror incorporated. X-ray evaluation of the second mirror at SPring-8 was conducted in February 2015, yielding FWHM size of ~0.2” for the PSF core at 8 keV while its HPD (half power diameter) size still remained at ~3” due to a large amount of small-angle scattering right outside the PSF core. Further improvements in the precision polish for the second mirror, in particular in the spatial scale from 0.3 mm to 5 mm, is currently under way with another X-ray evaluation at SPring-8 planned in spring 2016. Progress in our development activities for precision Wolter mirrors will be reported including at-wavelength evaluation results.
Conference Presentation
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Taro Sakao, Satoshi Matsuyama, Takumi Goto, Kazuto Yamauchi, Yoshiki Kohmura, Yoshinori Suematsu, and Noriyuki Narukage "Progress in precision Wolter mirrors for soft x-ray observations of the sun (Conference Presentation)", Proc. SPIE 9963, Advances in X-Ray/EUV Optics and Components XI, 99630L (2 November 2016); https://doi.org/10.1117/12.2237459
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KEYWORDS
Mirrors

X-rays

Sun

Polishing

X-ray imaging

Image resolution

Point spread functions

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