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Investigation of primary mirror segment's residual errors for the Thirty Meter Telescope

Seo, Byoung-Joon and Nissly, Carl and Angeli, George and MacMynowski, Doug and Sigrist , Norbert and Troy, Mitchell and Williams, Eric (2009) Investigation of primary mirror segment's residual errors for the Thirty Meter Telescope. In: Optical Modeling and Performance Predictions IV. Proceedings of SPIE. No.7427. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 74270F. ISBN 9780819477170. http://resolver.caltech.edu/CaltechAUTHORS:20170124-105949715

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Abstract

The primary mirror segment aberrations after shape corrections with warping harness have been identified as the single largest error term in the Thirty Meter Telescope (TMT) image quality error budget. In order to better understand the likely errors and how they will impact the telescope performance we have performed detailed simulations. We first generated unwarped primary mirror segment surface shapes that met TMT specifications. Then we used the predicted warping harness influence functions and a Shack-Hartmann wavefront sensor model to determine estimates for the 492 corrected segment surfaces that make up the TMT primary mirror. Surface and control parameters, as well as the number of subapertures were varied to explore the parameter space. The corrected segment shapes were then passed to an optical TMT model built using the Jet Propulsion Laboratory (JPL) developed Modeling and Analysis for Controlled Optical Systems (MACOS) ray-trace simulator. The generated exit pupil wavefront error maps provided RMS wavefront error and image-plane characteristics like the Normalized Point Source Sensitivity (PSSN). The results have been used to optimize the segment shape correction and wavefront sensor designs as well as provide input to the TMT systems engineering error budgets.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1117/12.828046DOIArticle
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=785657PublisherArticle
ORCID:
AuthorORCID
MacMynowski, Doug0000-0003-1987-9417
Additional Information:© 2009 Society of Photo-Optical Instrumentation Engineers (SPIE). 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
University of CaliforniaUNSPECIFIED
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:Primary Mirror Segment, Warping Harness, Shack-Hartmann, MACOS, Thirty Meter Telescope
Record Number:CaltechAUTHORS:20170124-105949715
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170124-105949715
Official Citation:Byoung-Joon Seo ; Carl Nissly ; George Angeli ; Doug MacMynowski ; Norbert Sigrist ; Mitchell Troy ; Eric Williams; Investigation of primary mirror segment's residual errors for the Thirty Meter Telescope. Proc. SPIE 7427, Optical Modeling and Performance Predictions IV, 74270F (October 01, 2009); doi:10.1117/12.828046.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73665
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Jan 2017 20:07
Last Modified:26 Jan 2017 20:07

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