1. Hard x-ray telescopes to be onboard ASTRO-H.
- Author
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Awaki H, Kunieda H, Ishida M, Matsumoto H, Babazaki Y, Demoto T, Furuzawa A, Haba Y, Hayashi T, Iizuka R, Ishibashi K, Ishida N, Itoh M, Iwase T, Kosaka T, Kurihara D, Kuroda Y, Maeda Y, Meshino Y, Mitsuishi I, Miyata Y, Miyazawa T, Mori H, Nagano H, Namba Y, Ogasaka Y, Ogi K, Okajima T, Saji S, Shimasaki F, Sato T, Sato T, Sugita S, Suzuki Y, Tachibana K, Tachibana S, Takizawa S, Tamura K, Tawara Y, Torii T, Uesugi K, Yamashita K, and Yamauchi S
- Subjects
- Computer-Aided Design, Equipment Design, Equipment Failure Analysis, Lenses, Spacecraft instrumentation, Telescopes, X-Ray Diffraction instrumentation
- Abstract
The new Japanese x-ray astronomy satellite, ASTRO-H, will carry two identical hard x-ray telescopes (HXTs), which cover the energy range of 5 to 80 keV. The HXT mirrors employ tightly nested, conically approximated thin-foil Wolter-I optics, and the mirror surfaces are coated with Pt/C depth-graded multilayers to enhance the hard x-ray effective area by means of Bragg reflection. The HXT comprises foils 120-450 mm in diameter and 200 mm in length, with a focal length of 12 m. To obtain a large effective area, 213 aluminum foils 0.2 mm in thickness are tightly nested confocally. The requirements for HXT are a total effective area of >300 cm
2 at 30 keV and an angular resolution of <1.7' in half-power diameter (HPD). Fabrication of two HXTs has been completed, and the x-ray performance of each HXT was measured at a synchrotron radiation facility, SPring-8 BL20B2 in Japan. Angular resolutions (HPD) of 1.9' and 1.8' at 30 keV were obtained for the full telescopes of HXT-1 and HXT-2, respectively. The total effective area of the two HXTs at 30 keV is 349 cm2 .- Published
- 2014
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