21 July 2010 The active optics system for the Discovery Channel Telescope
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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.
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Byron Smith, Byron Smith, Tomas Chylek, Tomas Chylek, Brian Cuerden, Brian Cuerden, Bill DeGroff, Bill DeGroff, Paul J. Lotz, Paul J. Lotz, Alexander Venetiou, Alexander Venetiou, } "The active optics system for the Discovery Channel Telescope", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77391T (21 July 2010); doi: 10.1117/12.858047; https://doi.org/10.1117/12.858047
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