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• W2022128403 abstract "We present the status of the development of a coronagraph for the Space Infrared telescope for Cosmology andAstrophysics (SPICA). SPICA is the next generation of infrared space-borne telescope missions following to AKARI,led by Japan. SPICA will carry a telescope that has a 3.5 m diameter monolithic primary mirror and the whole telescopewill be cooled to 4.5 K. It is planned to launch SPICA into the sun-earth L2 libration halo orbit using H II-A rocket in themiddle of the 2010s and execute infrared observations at wavelengths mainly between 5 and 200 micron. The SPICAmission gives us a unique opportunity for coronagraph observations, because of the large telescope aperture, the simplepupil shape, the capability of infrared observations from space, and the early launch. We have started development of theSPICA coronagraph in which the primary target is direct observation of extra-solar Jovian planets. The mainwavelengths of observation, the required contrast and the inner working angle (IWA) of the SPICA coronagraphinstrument are set to be 5-27 micron, 10-6, and a few λ/D (and as small as possible), respectively, in which λ is theobservation wavelength and D is the diameter of the telescope aperture (3.5m). We focused on a coronagraph with abinary shaped pupil mask as the primary candidate for SPICA because of its feasibility. Nano-fabrication technologyusing electron beam lithography was applied to manufacture a high precision mask and a laboratory experiment with aHe-Ne laser (λ=632.8nm) was performed in air without active wavefront control. The raw contrast derived from theaverage measured in the dark region reached 6.7×10-8. On the other hand, a study of Phase Induced AmplitudeApodization (PIAA) was started in an attempt to achieve higher performance, i.e., smaller IWA and higher throughput. Ahybrid solution using PIAA and a shaped pupil mask was proposed. A laboratory experiment was performed using a He-Ne laser with active wavefront control via a 32×32 channel deformable mirror. A raw contrast of 6.5×10-7 was achieved.Designs of binary shaped pupil mask are presented for the actual SPICA pupil which is obstructed by the telescope'ssecondary mirror and its support. Subtraction of point spread function (PSF) was also evaluated." @default.
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• W2022128403 date "2007-09-13" @default.
• W2022128403 modified "2023-10-03" @default.
• W2022128403 title "Coronagraph project with the SPICA mission" @default.
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• W2022128403 doi "https://doi.org/10.1117/12.733707" @default.
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