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Proceedings Paper

Focus and alignment of the Dark Energy Camera using out-of-focus stars
Author(s): Aaron Roodman
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Paper Abstract

The active optics system of the Dark Energy Camera (DECam) at the CTIO 4 meter Blanco telescope, built for the Dark Energy Survey, uses out-of-focus stars (donuts) to determine the camera's focus and alignment, as well as provide a measure of the wavefront. In this paper, we describe the donut analysis algorithm and present results on focus, alignment, and wavefront from a donut campaign conducted at the Blanco from 2010 to 2012, using the previous wide-field camera.

Paper Details

Date Published: 24 September 2012
PDF: 10 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84466O (24 September 2012); doi: 10.1117/12.926671
Show Author Affiliations
Aaron Roodman, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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