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Proceedings Paper

Progress in precision Wolter mirrors for soft x-ray observations of the sun (Conference Presentation)
Author(s): Taro Sakao; Satoshi Matsuyama; Takumi Goto; Kazuto Yamauchi; Yoshiki Kohmura; Yoshinori Suematsu; Noriyuki Narukage

Paper 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.

Paper Details

Date Published: 2 November 2016
PDF: 1 pages
Proc. SPIE 9963, Advances in X-Ray/EUV Optics and Components XI, 99630L (2 November 2016); doi: 10.1117/12.2237459
Show Author Affiliations
Taro Sakao, Institute of Space and Astronautical Science (Japan)
The Graduate Univ. for Advanced Studies (Japan)
Satoshi Matsuyama, Osaka Univ. (Japan)
Takumi Goto, Osaka Univ. (Japan)
Kazuto Yamauchi, Osaka Univ. (Japan)
Yoshiki Kohmura, RIKEN Harima Branch (Japan)
Yoshinori Suematsu, National Astronomical Observatory of Japan (Japan)
Noriyuki Narukage, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 9963:
Advances in X-Ray/EUV Optics and Components XI
Ali M. Khounsary; Shunji Goto; Christian Morawe, Editor(s)

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