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Proceedings Paper

Error budgets for the image degradation of x-ray telescope onboard Astro-E2
Author(s): Kazutami Misaki; Ryo Shibata; Yasuhiro Hidaka; Hideyo Kunieda; Manabu Ishida; Hirohiko Honda; Yoshitomo Maeda; Takao Endo; Kohsuke Imamura; Yoshito Haba; Kei Itoh; Hideyuki Mori; Ryo Iizuka; Akira Hayakawa; Taijiro Morihisa
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Paper Abstract

X-ray telescopes (XRTs) of nested thin foil mirrors were developed for Astro-E, the fifth Japanese x-ray astronomy satellite. Although the launch was not successful, the re-flight of Astro-E mission is approved as Astro-E2 and will carry the same XRTs. Ground-based calibration of Astro-E XRT revealed that its image quality and effective area are somewhat worse than what are expected from the original design. Conceivable causes of these defects of the XRT performance (i.e., surface roughness, waviness, misalignment of reflectors, and so on) are examined by X-rays and optical microscopic measurements. In this paper, we distinguish quantitatively these causes to limit the performance of the Astro-E XRT. Using the detail measurements, we can attribute both degradation of the image quality and a deficit of the effective area from the design values mainly to a slope error with a mm scale in each reflector and shadowing effects of neighboring reflectors due to various factors. There is still room for improvement in the support system of reflectors (i.e., alignment bars) in the XRT. One of the main aims of the mirror system calibration is to construct response function. Therefore, it is important that the development of a representative numerical model and its validation against extensive ground-based calibration. Taking account of the results of the pre-flight calibration and the microscopic measurements, we develop and tune a ray-tracing simulator which constructs the XRT response function for a point source at an arbitrary off-axis angle and spatial distributions of celestial X-ray sources.

Paper Details

Date Published: 11 March 2003
PDF: 12 pages
Proc. SPIE 4851, X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy, (11 March 2003); doi: 10.1117/12.461355
Show Author Affiliations
Kazutami Misaki, Institute of Space and Astronautical Science (Japan)
Ryo Shibata, Nagoya Univ. (Japan)
Yasuhiro Hidaka, Institute of Space and Astronautical Science (Japan)
Hideyo Kunieda, Institute of Space and Astronautical Science (Japan)
Manabu Ishida, Tokyo Metropolitan Univ. (Japan)
Hirohiko Honda, Institute of Space and Astronautical Science (Japan)
Yoshitomo Maeda, Institute of Space and Astronautical Science (Japan)
Takao Endo, Institute of Space and Astronautical Science (Japan)
Kohsuke Imamura, Institute of Space and Astronautical Science (Japan)
Yoshito Haba, Institute of Space and Astronautical Science (Japan)
Kei Itoh, Institute of Space and Astronautical Science (Japan)
Hideyuki Mori, Institute of Space and Astronautical Science (Japan)
Ryo Iizuka, Institute of Space and Astronautical Science (Japan)
Akira Hayakawa, Tokyo Metropolitan Univ. (Japan)
Taijiro Morihisa, Institute of Space and Astronautical Science (Japan)


Published in SPIE Proceedings Vol. 4851:
X-Ray and Gamma-Ray Telescopes and Instruments for Astronomy
Joachim E. Truemper; Harvey D. Tananbaum, Editor(s)

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