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DEVELOPMENT OF NEW STITCHING INTERFEROMETRY FOR THE SPICA TELESCOPE
Asa Yamanaka,HIDEHIRO KANEDA,MITSUYOSHI YAMAGISHI,TORU KONDO,Takuma Kokusho,Kotomi Tanaka,Misaki Hanaoka,TAKAO NAKAGAWA,Mitsunobu Kawada,Naoki Isobe,Toshiaki Arai,TAKASHI ONAKA 한국천문학회 2017 天文學論叢 Vol.32 No.1
The telescope to be onboard SPICA (Space Infrared Telescope for Cosmology and Astrophysics) has an aperture diameter of 2.5 m and its imaging performance is to be diffraction-limited at a wavelength of 20 μm at the operating temperature of < 8 K. Because manufacturing precise autocollimating flat mirrors (ACFs) with sizes comparable to the SPICA telescope is not technically feasible, we plan to use sub-aperture stitching interferometry through ACFs for optical testing of the telescope. We have verified the applicability of the sub-aperture stitching technique to the SPICA telescope by performing stitching experiments in a vacuum at a room temperature, using the 800-mm telescope and a 300-mm ACF. We have also developed a new method to reduce uncertainties possibly caused by cryogenic and gravitational deformations of ACFs.