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LSST active optics system software architecture

Thomas, Sandrine
Srinivasan Chandrasekharan ; Paul Lotz ; Bo Xin ; Charles Claver ; George Angeli ; Jacques Sebag ; Gregory P. Dubois-Felsmann
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.
Publication Date: 
Monday, August 8, 2016
Type: 
Conference Papers
SPIE
Tags: 
Citable: 
no
SPIE Proceedings
Volume: 
9906
Abstract: 
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. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Publication-115
Reviewed Under: 
LSST Project Publication Policy
Bibtex reference: 
@proceeding{doi:10.1117/12.2231798, author = {Thomas, Sandrine J. and Chandrasekharan, Srinivasan and Lotz, Paul and Xin, Bo and Claver, Charles and Angeli, George and Sebag, Jacques and Dubois-Felsmann, Gregory P.}, title = { LSST active optics system software architecture }, journal = {Proc. SPIE}, volume = {9906}, number = {}, pages = {99063B-99063B-10}, abstract = { 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. }, year = {2016}, doi = {10.1117/12.2231798}, URL = { http://dx.doi.org/10.1117/12.2231798}, eprint = {} }

Financial support for LSST comes from the National Science Foundation (NSF) through Cooperative Agreement No. 1258333, the Department of Energy (DOE) Office of Science under Contract No. DE-AC02-76SF00515, and private funding raised by the LSST Corporation. The NSF-funded LSST Project Office for construction was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA).  The DOE-funded effort to build the LSST camera is managed by the SLAC National Accelerator Laboratory (SLAC).
The National Science Foundation (NSF) is an independent federal agency created by Congress in 1950 to promote the progress of science. NSF supports basic research and people to create knowledge that transforms the future.
NSF and DOE will continue to support LSST in its Operations phase. They will also provide support for scientific research with LSST data.   




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