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Investigation of Thirty Meter Telescope wavefront maintenance using low-order Shack-Hartmann wavefront sensors to correct for thermally-induced misalignments

Nissly, Carl and Seo, Byoung-Joon and Troy, Mitchell and Angeli, George and Cho, Myung and Shelton, Chris and Sigrist, Norbert and Sirota, Mark (2010) Investigation of Thirty Meter Telescope wavefront maintenance using low-order Shack-Hartmann wavefront sensors to correct for thermally-induced misalignments. In: Modeling, Systems Engineering, and Project Management for Astronomy IV. Proceedings of SPIE. No.7738. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 77380H. ISBN 978-0-81948-228-0. https://resolver.caltech.edu/CaltechAUTHORS:20161031-083213017

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Abstract

We evaluate how well the performance of the Thirty Meter Telescope (TMT) can be maintained against thermally induced errors during a night of observation. We first demonstrate that using look-up-table style correction for TMT thermal errors is unlikely to meet the required optical performance specifications. Therefore, we primarily investigate the use of a Shack-Hartmann Wavefront Sensor (SH WFS) to sense and correct the low spatial frequency errors induced by the dynamic thermal environment. Given a basic SH WFS design, we position single or multiple sensors within the telescope field of view and assess telescope performance using the JPL optical ray tracing tool MACOS for wavefront simulation. Performance for each error source, wavefront sensing configuration, and control scheme is evaluated using wavefront error, plate scale, pupil motion, pointing error, and the Point Source Sensitivity (PSSN) as metrics. This study provides insight into optimizing the active optics control methodology for TMT in conjunction with the Alignment and Phasing System (APS) and primary mirror control system (M1CS).


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.857849DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=751397PublisherArticle
Additional Information:© 2010 SPIE. The International Society for Optical Engineering. This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, and was sponsored by the California Institute of Technology and the National Aeronautics and Space Administration. The authors gratefully acknowledge the support of the TMT partner institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology and the University of California. This work was supported as well by the Gordon and Betty Moore Foundation, the Canada Foundation for Innovation, the Ontario Ministry of Research and Innovation, the National Research Council of Canada, the Natural Sciences and Engineering Research Council of Canada, the British Columbia Knowledge Development Fund, the Association of Universities for Research in Astronomy (AURA) and the U.S. National Science Foundation.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
NASA/JPL/CaltechUNSPECIFIED
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
CaltechUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for InnovationUNSPECIFIED
Ontario Ministry of Research and InnovationUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
British Columbia Knowledge Development FundUNSPECIFIED
Association of Universities for Research in Astronomy (AURA)UNSPECIFIED
NSFUNSPECIFIED
Subject Keywords:Wavefront Sensing and Control, Active Optics, On-Instrument Wavefront Sensor, Shack-Hartmann, Segmented Mirrors, Optical Modeling, MACOS, Point Source Sensitivity, Thirty Meter Telescope
Series Name:Proceedings of SPIE
Issue or Number:7738
Record Number:CaltechAUTHORS:20161031-083213017
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161031-083213017
Official Citation:Carl Nissly ; Byoung-Joon Seo ; Mitchell Troy ; George Angeli ; Myung Cho ; Chris Shelton ; Norbert Sigrist ; Mark Sirota; Investigation of Thirty Meter Telescope wavefront maintenance using low-order Shack-Hartmann wavefront sensors to correct for thermally-induced misalignments. Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77380H (August 03, 2010); doi:10.1117/12.857849.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71602
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 Oct 2016 15:52
Last Modified:03 Oct 2019 16:09

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