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Proceedings Paper

The Discovery Channel Telescope optical coating system
Author(s): Heather K. Marshall; Gary S. Ash; William F. Parsley
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Paper Abstract

The Discovery Channel Telescope (DCT) is a project of Lowell Observatory, undertaken with support from Discovery Communications, Inc., to design and construct a 4-meter class telescope and support facility on a site approximately 40 miles southeast of Flagstaff, AZ. Lowell Observatory contracted with Dynavac of Hingham, MA to design and build an optical coating system for the DCT optics. The DCT Optical Coating System includes a mechanical roughing pump, two high-vacuum cryogenic pumps, a Meissner trap, evaporative filament aluminum deposition system, LabView software and PLC-based control system, and all ancillary support equipment. The system was installed at the site and acceptance testing was completed in October 2009. The Optical Coating System achieved near perfect reflectivity performance, thickness uniformity of 1000 angstroms ±10%, and adhesion conforming to MIL-F-48616, Section This paper discusses the design and analysis of the coating system, the process of transportation and assembly as well as testing results.

Paper Details

Date Published: 5 August 2010
PDF: 10 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773355 (5 August 2010); doi: 10.1117/12.856467
Show Author Affiliations
Heather K. Marshall, National Solar Observatory (United States)
Lowell Observatory (United States)
Gary S. Ash, DynaVac (United States)
William F. Parsley, DynaVac (United States)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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