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Proceedings Paper

Upgraded hard x-ray telescope with multilayer supermirror for the InFOCµS balloon experiment
Author(s): Ryo Shibata; Yasushi Ogasaka; Keisuke Tamura; Akihiro Furuzawa; Yuzuru Tawara; Koujun Yamashita; Rika Takahashi; Machiko Sakashita; Takuya Miyazawa; Kenta Shimoda; Chiaki Sakai; Nobuaki Yamada; Masataka Naitou; Taku Futamura; Peter J. Serlemitsos; Yang Soong; Kai-Wing Chan; Takashi Okajima; Jack Tueller; Hans A. Krimm; Scott D. Barthelmy; Scott M. Owens; Hideyo Kunieda; Yoshiharu Namba
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Paper Abstract

Hard X-ray focusing observation is important to reveal non-thermal emission mechanism and origin in active galaxies and clusters of galaxies. We have carried out the hard X-ray observation throughout the ¥infocus program, which is an international balloon-borne experiment in collaboration with NASA/GSFC and Nagoya University. The telescope is conical approximation of Wolter-I optics with 8 m focal length and 40 cm diameter. It consists of 255 nested thin (0.17 mm thickness) reflectors with incidence angles of 0.10° to 0.36°. Reflectors are coated with depth-graded platinum-carbon (Pt/C) multilayers, so-called supermirrors, with periodic length of 2.6 to 13 nm and bi-layer number of 28 to 79, depending on incidence angles. We are now continuously fabricating advanced next hard X-ray telescope for the second ¥infocus flight in 2004. Compared with the first telescope, the following improvements have been made on the second one. Supermirror reflectors have wider sensitivity in energy band of 20-60 keV adopting optimum supermirror design for balloon observation, and smaller interfacial roughness owing to complete replication technique. For upgrading of the image quality, we then adopted stiffer reflector substrate, selected replication mandrel with better shape, and the modified telescope housing with higher alignment accuracy for reflectors. The performance of the new hard X-ray telescope was measured in X-ray beamline facility in ISAS/JAXA and synchrotron radiation facility SPring-8. The effective area and image quality are obtained to be 45 cm2 at 30 keV and 23 cm2 at 40 keV, and 2.5 arcmin in half power diameter, respectively. In this paper we report our development of the upgraded hard X-ray telescope for the second balloon flight experiment.

Paper Details

Date Published: 11 October 2004
PDF: 12 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.551462
Show Author Affiliations
Ryo Shibata, Nagoya Univ. (Japan)
Yasushi Ogasaka, Nagoya Univ. (Japan)
Keisuke Tamura, Nagoya Univ. (Japan)
Akihiro Furuzawa, Nagoya Univ. (Japan)
Yuzuru Tawara, Nagoya Univ. (Japan)
Koujun Yamashita, Nagoya Univ. (Japan)
Rika Takahashi, Nagoya Univ. (Japan)
Machiko Sakashita, Nagoya Univ. (Japan)
Takuya Miyazawa, Nagoya Univ. (Japan)
Kenta Shimoda, Nagoya Univ. (Japan)
Chiaki Sakai, Nagoya Univ. (Japan)
Nobuaki Yamada, Nagoya Univ. (Japan)
Masataka Naitou, Nagoya Univ. (Japan)
Taku Futamura, Nagoya Univ. (Japan)
Peter J. Serlemitsos, NASA Goddard Space Flight Ctr. (United States)
Yang Soong, NASA Goddard Space Flight Ctr. (United States)
Kai-Wing Chan, NASA Goddard Space Flight Ctr. (United States)
Takashi Okajima, NASA Goddard Space Flight Ctr. (United States)
Jack Tueller, NASA Goddard Space Flight Ctr. (United States)
Hans A. Krimm, NASA Goddard Space Flight Ctr. (United States)
Scott D. Barthelmy, NASA Goddard Space Flight Ctr. (United States)
Scott M. Owens, NASA Goddard Space Flight Ctr. (United States)
Hideyo Kunieda, Nagoya Univ. (Japan)
Institute of Space and Astronautical Science/Japan Aerospace Exploration Agency (Japan)
Yoshiharu Namba, Chubu Univ. (Japan)


Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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