Development of an MIR coronagraph for the SPICA mission


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We present the status of the development of a coronagraph for the Space Infrared telescope for Cosmology and Astrophysics (SPICA). SPICA is the next generation infrared space-borne telescope missions led by Japan. The SPICA satellite will be equipped with a telescope that has a 3.5 m diameter monolithic primary mirror and the whole telescope will be cooled to 4.5 K. The satellite is planed be launched early in the 2010s into the sun-earth L2 libration halo orbit and execute infrared observations at wavelengths mainly between 5 and 200 micron. The SPICA mission gives us a unique opportunity for coronagraph observations, because of the large telescope aperture, a simple pupil shape, capability of infrared observations from space and the early launch. We have started development of the SPICA coronagraph in which the primary target is direct observation of extra-solar Jovian planets. The main wavelengths of observation, the required contrast and the inner working angle (IWA) of the SPICA coronagraph instrument are set to be 5-20 micron, 10~6, and approximately 5 λ/D respectively, where λ is the observation wavelength and D is the diameter of the telescope aperture. Coronagraphs using a checkerboard mask and a concentric ring mask have been investigated. We found some solutions for the SPICA pupil, which has a large obstruction due to the secondary mirror and its supports. We carried out laboratory experiments to examine coronagraphs obtained using checkerboard-type pupil masks with a central obstruction. Nano-fabrication technology with electron beam was applied to manufacture a high precision mask consisting of a patterned aluminum film on a glass substrate and its performance was confirmed by experiments with visible light. Contrast higher than 10~6 was achieved. In the future, we will be developing a cryogenic mid-infrared test-bed to investigate the SPICA coronagraphs.
机译:我们介绍了用于宇宙学和天体物理学的太空红外望远镜(SPICA)日冕仪的发展状况。 SPICA是由日本领导的下一代红外星载望远镜任务。 SPICA卫星将配备望远镜,该望远镜具有3.5 m直径的单片主镜,整个望远镜将冷却至4.5K。该卫星计划于2010年代初发射到L2解放日月光环轨道并执行红外观察的波长主要在5到200微米之间。 SPICA的任务为我们提供了进行日冕仪观测的独特机会,这是因为它具有较大的望远镜孔径,简单的瞳孔形状,可以从太空进行红外观测并可以进行早期发射。我们已经开始开发SPICA日冕仪,其主要目标是直接观察太阳外的木星行星。 SPICA冠冕仪的主要观察波长,所需的对比度和内工作角(IWA)分别设置为5-20微米,10〜6和大约5λ/ D,其中λ是观察波长, D是望远镜孔径的直径。已经研究了使用棋盘格掩模和同心环掩模的日冕仪。我们发现了针对SPICA学生的一些解决方案,该学生由于辅助镜及其支撑而受阻较大。我们进行了实验室实验,以检查使用具有中心阻塞的棋盘型瞳孔罩获得的日冕仪。运用电子束纳米制造技术,在玻璃基板上制作了由铝膜图案组成的高精度掩模,并通过可见光实验证实了其性能。对比度高于10〜6。将来,我们将开发一个低温中红外测试台,以研究SPICA日冕仪。



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