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Proceedings Paper

Measurement of reflectivity of x-ray mirror for soft x-ray telescope onboard ASTRO-H
Author(s): Satoshi Sugita; Akihiro Furuzawa; Kazunori Ishibashi; Keisuke Tamura; Takashi Okajima; Yoshitomo Maeda; Takuro Sato; Kou Ichihara; Kazuki Tomikawa; Ryo Iizuka; Takashi Awaya; Kohta Okada
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Paper Abstract

X-ray reflection mirror of the Soft X-ray Telescope onboard ASTRO-H was coated by gold thin layer. Gold have M-shell X-ray absorption edge around 2 keV which is included in the energy band covered with the focal plane detector such as Soft X-ray Imager and Soft X-ray Spectrometer. It is important to make response function taken int account the Au M-dege structure especially for the Soft X-ray Spectrometer because It has unprecedented high energy resolution of 5 eV from 0.3 to 12 keV. We performed the detailed measurements of of reflectivity of the mirror using reflectometer in the synchrotron radiation facility KEK PF BL-11B from Nov. 29, 2011 to Dec. 5. X-ray beam of BL–11B was monochromatized to E/deltaE of 5000 by Double crystal monochromator using Si(111). We obtained the reflectivity at the grazing incident angles of 1.0, 1.2, and 1.4 degrees. While the energy pitch was set to be 2 eV in the 2.1–4.1 keV band, the reflectivity in the 2.2–2.35 keV band was also measured in detail with the energy pitch of 0.25 eV. We report the results and optical parameters of the SXT mirror such as reflectivity, and roughness calculated from the measurements.

Paper Details

Date Published: 27 September 2012
PDF: 6 pages
Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844358 (27 September 2012); doi: 10.1117/12.926711
Show Author Affiliations
Satoshi Sugita, Ecotopia Science Institute, Nagoya Univ. (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Kazunori Ishibashi, Nagoya Univ. (Japan)
Keisuke Tamura, Nagoya Univ. (Japan)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Yoshitomo Maeda, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Takuro Sato, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Kou Ichihara, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Kazuki Tomikawa, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (Japan)
Ryo Iizuka, Chuo Univ. (Japan)
Takashi Awaya, Chuo Univ. (Japan)
Kohta Okada, Chuo Univ. (Japan)


Published in SPIE Proceedings Vol. 8443:
Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Stephen S. Murray; Jan-Willem A. den Herder, Editor(s)

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