Development of lightweight SiC mirrors for the space infrared telescope for cosmology and astrophysics (SPICA) mission
Development of lightweight SiC mirrors for the space infrared telescope for cosmology and astrophysics (SPICA) mission
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DOI：
10.1117/12.733430
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发表时间：
2007-09
期刊：
影响因子：
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通讯作者：
H. Kaneda;T. Nakagawa;T. Onaka;K. Enya;H. Kataza;S. Makiuti;H. Matsuhara;Masashi Miyamoto;H. Murakami;Hideki Saruwatari;H. Watarai;Y. Yui
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文献类型：
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作者：
H. Kaneda;T. Nakagawa;T. Onaka;K. Enya;H. Kataza;S. Makiuti;H. Matsuhara;Masashi Miyamoto;H. Murakami;Hideki Saruwatari;H. Watarai;Y. Yui
SPICA（Space Infrared Telescope for Cosmology and Astrophysics，宇宙学和天体物理学用空间红外望远镜）是日本的一个天文红外卫星项目，配备3.5米望远镜。发射的目标年份是2017年。该望远镜在太空中通过新开发的机械冷却器与L2点处的高效辐射冷却系统的组合冷却到4.5 K。SPICA望远镜的总重量要求小于700 kg，成像性能要求在4.5 K时达到5 μm衍射极限。SPICA望远镜反射镜的材料是碳化硅（SiC）。在各种类型的SiC中，主要候选物包括正常烧结的SiC、反应烧结的SiC和碳纤维增强的SiC;后两种在日本一直在开发。本文报告了SPICA望远镜的当前设计和状态，沿着，我们最近的活动，对SiC和C/SiC复合镜的低温光学测试，包括一个创新的支持机制，低温镜的发展，这是基于经验教训，从SiC 70厘米望远镜板载以前的日本红外天文使命AKARI。
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.