The University of Tokyo Atacama Observatory 6.5m Telescope: Design of mirror coating system and its performances II

Hidenori Takahashi; Yuzuru Yoshii; Mamoru Doi; Takashi Miyata; Kotaro Kohno; Masuo Tanaka; Kentaro Motohara; Takeo Minezaki; Shigeyuki Sako; Tomoki Morokuma; Toshihiko Tanabé; Bunyo Hatsukade; Masahiro Konishi; Takafumi Kamizuka; Kentaro Asano; Hiroaki Sameshima; Natsuko Kato; Mizuki Numata; Tsutomu Aoki; Takao Soyano; Ken'ichi Tarusawa; Yoshimitsu Kawai; Hiroshi Ogawa

doi:10.1117/12.2561871

13 December 2020 The University of Tokyo Atacama Observatory 6.5m Telescope: Design of mirror coating system and its performances II

Hidenori Takahashi, Yuzuru Yoshii, Mamoru Doi, Takashi Miyata, Kotaro Kohno, Masuo Tanaka, Kentaro Motohara, Takeo Minezaki, Shigeyuki Sako, Tomoki Morokuma, Toshihiko Tanabé, Bunyo Hatsukade, Masahiro Konishi, Takafumi Kamizuka, Kentaro Asano, Hiroaki Sameshima, Natsuko Kato, Mizuki Numata, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yoshimitsu Kawai, Hiroshi Ogawa

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 1144564 (2020) https://doi.org/10.1117/12.2561871
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The telescope of the University of Tokyo Atacama Observatory has a primary mirror with a diameter in 6.5m. In order to fabricate the reflecting film initially on the mirror surface and to maintain its optical performance over a long period, a mirror{coating facility will be installed in operation building beside enclosure of the telescope at the summit of Co. Chajnantor (5,640m). The facility consists of mirror coating chamber, cleaning unit for stripping off the old film and clean-up the mirror, and a cart with a lifter for handling the primary mirror cell. Almost all equipment, including the main chamber, was completed by early 2020 and engaged as a mirror coating facility. In order to optimize the coating parameters, comprehensive performance tests were carried out (without primary mirror cell which plays a role of a part of chamber). The evaluation items are how long it takes to reach the target vacuum level and parameters of the current, voltage, and application time during ion bombardment and aluminization. Through iterating test, we were able to obtain each parameter that ultimately met the requirements of the TAO telescope mirror.

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Hidenori Takahashi, Yuzuru Yoshii, Mamoru Doi, Takashi Miyata, Kotaro Kohno, Masuo Tanaka, Kentaro Motohara, Takeo Minezaki, Shigeyuki Sako, Tomoki Morokuma, Toshihiko Tanabé, Bunyo Hatsukade, Masahiro Konishi, Takafumi Kamizuka, Kentaro Asano, Hiroaki Sameshima, Natsuko Kato, Mizuki Numata, Tsutomu Aoki, Takao Soyano, Ken'ichi Tarusawa, Yoshimitsu Kawai, and Hiroshi Ogawa "The University of Tokyo Atacama Observatory 6.5m Telescope: Design of mirror coating system and its performances II", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 1144564 (13 December 2020); https://doi.org/10.1117/12.2561871

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