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Proceedings Paper

The active optics system for the Discovery Channel Telescope
Author(s): Byron Smith; Tomas Chylek; Brian Cuerden; Bill DeGroff; Paul J. Lotz; Alexander Venetiou
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Paper Abstract

The Discovery Channel Telescope (DCT) is a 4.3-meter telescope designed for dual optical configurations, featuring an f/6.1 Ritchey-Chretien prescription with a 0.5° field-of-view, and a corrected f/2.3 prime focus with a 2° field-of-view. The DCT Active Optics System (AOS) maintains collimation and mirror figure to provide seeing limited images across the focal planes and rapid settling times to minimize observing overhead, using a combination of feed-forward and lowbandwidth feedback control via wavefront sensing. Collimation is maintained by tip-tilt-piston control of the M2 assembly and articulating M1 within its cell, taking advantage of the 120 degree-of-freedom support used for figure control. We present an overview of the AOS design and principles of operation, and a summary of progress and results to date.

Paper Details

Date Published: 21 July 2010
PDF: 21 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77391T (21 July 2010); doi: 10.1117/12.858047
Show Author Affiliations
Byron Smith, Lowell Observatory (United States)
Tomas Chylek, Lowell Observatory (United States)
Brian Cuerden, College of Optical Sciences, The Univ. of Arizona (United States)
Bill DeGroff, Lowell Observatory (United States)
Paul J. Lotz, Lowell Observatory (United States)
Alexander Venetiou, Lowell Observatory (United States)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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