22 July 2014 Design of mirror coating facility for The University of Tokyo Atacama Observatory 6.5m telescope
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Abstract
The telescope of the University of Tokyo Atacama Observatory has a 6.5-m primary mirror in diameter. In order to fabricate the reflecting film initially and to maintain its performance over a long period, we have mirror coating facility on site. We have chosen to leave the primary mirror in its cell with the mirror support system intact. Two major advantages of leaving the mirror in its cell are that the mirror does not have to be lifted or handled and the support system does not have to be removed or reinstalled for coating. The facility consists of a clean booth for stripping of the old film, an evaporation coating chamber, and a cart with a lifter for handling the primary mirror. A conventional evaporation system with a metal pre-wetted filament array is adopted for achieving various optical requests. The coating equipment has also a function of fabrication for film on secondary and tertiary mirrors.
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Hidenori Takahashi, Tsutomu Aoki, Mamoru Doi, Toshihiro Handa, Takafumi Kamizuka, Natsuko M. Kato, Kimiaki Kawara, Kotaro Kohno, Masahiro Konishi, Shintaro Koshida, Takeo Minezaki, Takashi Miyata, Tomoki Morokuma, Kentaro Motohara, Shigeyuki Sako, Takao Soyano, Yoishi Tamura, Toshihiro Tanabé, Masuo Tanaka, Ken'ichi Tarusawa, Yuzuru Yoshii, "Design of mirror coating facility for The University of Tokyo Atacama Observatory 6.5m telescope", Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91454N (22 July 2014); doi: 10.1117/12.2055577; https://doi.org/10.1117/12.2055577
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