15 June 2006 Measurements of reflectivity of x-ray mirror for Suzaku satellite
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Abstract
Detailed measurements of reflectivity of gold, which is used for X-ray mirror for X-ray telescope onboard "Suzaku" satellite was performed in the synchrotron radiation facility SPring-8 BL15XU. We measured reflectivity of the mirror, which uses total reflection of gold thin layer. Grazing incidence angle is 0.5 degree and incident X-ray monochromatized in the energy range from 2.2 keV to 3.5 keV, where M-edge structure of gold appears. We used double crystal monochrometer using Si(111) crystal, (ΔE/E ~ 10-4) to monochromatize the incident X-ray. Energy calibration was performed using L-edge of molybdenum (2530.2 eV) and K-edge of argon (3205.9 eV). From the results, that the energy of M-V and M-IV edge of gold is different from optical constant table, and almost same as the value reported by Graessle et al.(1992).1 It is important to study the optical constants of gold or other mirror material for X-ray astronomy. This results will be feed back to the response function of the X-ray telescope of Suzaku satellite. It is very important for X-ray spectroscopy in X-ray astronomy.
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Keisuke Tamura, Yasushi Ogasaka, Masataka Naitou, Yoshitomo Maeda, Masatoshi Ebara, Akiharu Itoh, Ryo Iizuka, Yushi Yokoyama, "Measurements of reflectivity of x-ray mirror for Suzaku satellite", Proc. SPIE 6266, Space Telescopes and Instrumentation II: Ultraviolet to Gamma Ray, 62663D (15 June 2006); doi: 10.1117/12.671474; https://doi.org/10.1117/12.671474
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