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Proceedings Paper

Development of large aperture cooled telescopes for the space infrared telescope for cosmology and astrophysics (SPICA) mission
Author(s): Takashi Onaka; Hidehiro Kaneda; Keigo Enya; Takao Nakagawa; Hiroshi Murakami; Hideo Matsuhara; Hirokazu Kataza
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Paper Abstract

The Space Infrared Telescope for Cosmology and Astrophysics (SPICA) mission is the third Japanese astronomical infrared satellite project of a 3.5m cooled telescope optimized for mid- to far-infrared observations, following the Infrared Telescope in Space (IRTS) and the ASTRO-F missions. It will employ mechanical coolers and an efficient radiative cooling system, which allow us to have a cooled (4.5K) telescope of the aperture much larger than previous missions in space. The SPICA will attack a number of key problems in present-day astrophysics, ranging from the origin of the universe to the formation of planetary systems, owing to its high spatial resolution and unprecedented sensitivity in the mid- to far-infrared. The large aperture size for cryogenically use is, however, a great challenge and demands substantial technology developments for the telescope system. We adopt monolithic mirror design in the baseline model because of the technical feasibility and reliability. We set the optical performance requirement as being diffraction limited at 5μm at the operating temperature of 4.5K. The total weight attributed to the telescope system is 700kg, which requires a very light 3.5m primary mirror together with the mirror support structure. At present we are working on two candidate materials for the SPICA telescope: silicon carbide (SiC) and carbon-fiber reinforced silicon carbide (C/SiC). This presentation gives a general overview of the SPICA mission and reports the current design and status of the SPICA telescope system, including recent progress of the development of C/SiC mirrors.

Paper Details

Date Published: 14 October 2005
PDF: 15 pages
Proc. SPIE 5962, Optical Design and Engineering II, 59621J (14 October 2005); doi: 10.1117/12.625020
Show Author Affiliations
Takashi Onaka, Univ. of Tokyo (Japan)
Hidehiro Kaneda, Japan Aerospace Exploration Agency (Japan)
Keigo Enya, Japan Aerospace Exploration Agency (Japan)
Takao Nakagawa, Japan Aerospace Exploration Agency (Japan)
Hiroshi Murakami, Japan Aerospace Exploration Agency (Japan)
Hideo Matsuhara, Japan Aerospace Exploration Agency (Japan)
Hirokazu Kataza, Japan Aerospace Exploration Agency (Japan)


Published in SPIE Proceedings Vol. 5962:
Optical Design and Engineering II
Laurent Mazuray; Rolf Wartmann, Editor(s)

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