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LSST Active Optics System Software Architecture

Thomas, Sandrine J. and Lotz, P. and Chandrasekharan, Srinivasan and Xin, Bo and Claver, Charles and Angeli, George and Sebag, Jacques and Dubois-Felsmann, Gregory P. (2016) LSST Active Optics System Software Architecture. In: Ground-based and Airborne Telescopes VI. Proceedings of SPIE. No.9906. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 99063B. ISBN 978-1-5106-0191-8.

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The Large Synoptic Survey Telescope (LSST) is an 8-meter class wide-field telescope now under construction on Cerro Pachon, near La Serena, Chile. This ground-based telescope is designed to conduct a decade-long time domain survey of the optical sky. In order to achieve the LSST scientific goals, the telescope requires delivering seeing limited image quality over the 3.5 degree field-of-view. Like many telescopes, LSST will use an Active Optics System (AOS) to correct in near real-time the system aberrations primarily introduced by gravity and temperature gradients. The LSST AOS uses a combination of 4 curvature wavefront sensors (CWS) located on the outside of the LSST field-of-view. The information coming from the 4 CWS is combined to calculate the appropriate corrections to be sent to the 3 different mirrors composing LSST. The AOS software incorporates a wavefront sensor estimation pipeline (WEP) and an active optics control system (AOCS). The WEP estimates the wavefront residual error from the CWS images. The AOCS determines the correction to be sent to the different degrees of freedom every 30 seconds. In this paper, we describe the design and implementation of the AOS. More particularly, we will focus on the software architecture as well as the AOS interactions with the various subsystems within LSST.

Item Type:Book Section
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Dubois-Felsmann, Gregory P.0000-0003-1598-6979
Additional Information:© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE). This material is based upon work supported in part by the National Science Foundation through Cooperative Agreement 1258333 managed by the Association of Universities for Research in Astronomy (AURA), and the Department of Energy under Contract No. DE-AC02-76SF00515 with the SLAC National Accelerator Laboratory. Additional LSST funding comes from private donations, grants to universities, and in-kind support from LSSTC Institutional Members.
Funding AgencyGrant Number
Association of Universities for Research in Astronomy (AURA)1258333
Department of Energy (DOE)DE-AC02-76SF00515
LSSTC Institutional MembersUNSPECIFIED
Subject Keywords:Large Synoptic Survey Telescope, Active Optics, Wide Field of View, Curvature Sensing
Series Name:Proceedings of SPIE
Issue or Number:9906
Record Number:CaltechAUTHORS:20170111-080046392
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Official Citation:Sandrine J. Thomas ; Srinivasan Chandrasekharan ; Paul Lotz ; Bo Xin ; Charles Claver ; George Angeli ; Jacques Sebag ; Gregory P. Dubois-Felsmann; LSST active optics system software architecture . Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063B (August 8, 2016); doi:10.1117/12.2231798.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73409
Deposited By: Ruth Sustaita
Deposited On:11 Jan 2017 21:42
Last Modified:09 Mar 2020 13:18

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