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Proceedings Paper

Cleaning procedure for mirror coating at the Subaru Telescope
Author(s): Masami Yutani; Saeko S. Hayashi; Tomio Kurakami; Tomio Kanzawa; Norio Ohshima; Masao Nakagiri
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Paper Abstract

We would like to present the procedure of how to prepare the primary mirror of Subaru Telescope for the realuminization. The equipment for the coating and its preparation are located at the ground floor of the telescope enclosure. There are two trolleys for carrying the mirror cell and the mirror itself, a mirror lifting jig, a washing facility for the primary mirror (PMWF), the water purification system, the coating chamber and the waste water pit. The PMWF can provide the tap water for initial rinsing, the chemical for stripping the old coating, and the deionized water for final cleaning. It has two pairs of arms that deploy horizontally above the mirror and have nozzles to spray. The arms spin around its center where the rotary joints are connected to the plumbing from storage tanks. Deck above the water arms serve as platform for personnel for the inspection or for scrubbing work. We use hydrochloric acid mixture to remove the old aluminum coating. For rinsing and final cleaning, we use the water through the purification system. The water supply from the nozzles and the rotation of the arms can be controlled from a panel separated from the washing machine itself. After several experiments and improvements in the washing, we have carried out the coating of the 8.3 m primary mirror in September last year. This was the third time, and the reflectivity of the new coating show satisfactory result.

Paper Details

Date Published: 4 February 2003
PDF: 9 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.456785
Show Author Affiliations
Masami Yutani, National Astronomical Observatory of Japan (Japan)
Saeko S. Hayashi, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Tomio Kurakami, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Tomio Kanzawa, Subaru Telescope/National Astronomical Observatory of Japan (United States)
Norio Ohshima, National Astronomical Observatory of Japan (Japan)
Masao Nakagiri, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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