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Proceedings Paper

Development of lightweight SiC mirrors for the space infrared telescope for cosmology and astrophysics (SPICA) mission
Author(s): Hidehiro Kaneda; Takao Nakagawa; Takashi Onaka; Keigo Enya; Hirokazu Kataza; Sin'itirou Makiuti; Hideo Matsuhara; Masashi Miyamoto; Hiroshi Murakami; Hideki Saruwatari; Hidenori Watarai; Yukari Y. Yui
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Paper Abstract

SPICA (Space Infrared Telescope for Cosmology and Astrophysics) is a Japanese astronomical infrared satellite project with a 3.5-m telescope. The target year for launch is 2017. The telescope is cooled down to 4.5 K in space by a combination of newly-developed mechanical coolers with an efficient radiative cooling system at the L2 point. The SPICA telescope has requirements for its total weight to be lighter than 700 kg and for the imaging performance to be diffraction-limited at 5 μm at 4.5 K. Material for the SPICA telescope mirrors is silicon carbide (SiC). Among various types of SiC, primary candidates comprise normally-sintered SiC, reaction-sintered SiC, and carbon-fiber-reinforced SiC; the latter two have been being developed in Japan. This paper reports the current design and status of the SPICA telescope along with our recent activities on the cryogenic optical testing of SiC and C/SiC composite mirrors, including the development of an innovative support mechanism for cryogenic mirrors, which are based on lessons learned from a SiC 70 cm telescope onboard the previous Japanese infrared astronomical mission AKARI.

Paper Details

Date Published: 15 September 2007
PDF: 9 pages
Proc. SPIE 6666, Optical Materials and Structures Technologies III, 666607 (15 September 2007); doi: 10.1117/12.733430
Show Author Affiliations
Hidehiro Kaneda, Japan Aerospace Exploration Agency (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Keigo Enya, Japan Aerospace Exploration Agency (Japan)
Hirokazu Kataza, Japan Aerospace Exploration Agency (Japan)
Sin'itirou Makiuti, Japan Aerospace Exploration Agency (Japan)
Hideo Matsuhara, Japan Aerospace Exploration Agency (Japan)
Masashi Miyamoto, Japan Aerospace Exploration Agency (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)
Hideki Saruwatari, Japan Aerospace Exploration Agency (Japan)
Hidenori Watarai, Japan Aerospace Exploration Agency (Japan)
Yukari Y. Yui, Japan Aerospace Exploration Agency (Japan)

Published in SPIE Proceedings Vol. 6666:
Optical Materials and Structures Technologies III
William A. Goodman; Joseph L. Robichaud, Editor(s)

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