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Thermal performance prediction of the TMT optics

Cho, Myung and Corredor, Andrew and Pootrakul, Shane and Vogiatzis, Konstantinos and Angeli, George (2008) Thermal performance prediction of the TMT optics. In: Modeling, Systems Engineering, and Project Management for Astronomy III. Proceedings of SPIE. No.7017. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 701716. ISBN 9780819472274. https://resolver.caltech.edu/CaltechAUTHORS:20180802-142536671

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Abstract

Thermal analysis for the Thirty Meter Telescope (TMT) optics (the primary mirror segment, the secondary mirror, and the tertiary mirror) was performed using finite element analysis in ANSYS and I-DEAS. In the thermal analysis, each of the optical assemblies (mirror, mirror supports, cell) was modeled for various thermal conditions including air convections, conductions, heat flux loadings, and radiations. The thermal time constant of each mirror was estimated and the temperature distributions of the mirror assemblies were calculated under the various thermal loading conditions. The thermo-elastic analysis was made to obtain the thermal deformation based on the resulting temperature distributions. The optical performance of the TMT optics was evaluated from the thermally induced mirror deformations. The goal of this thermal analysis is to establish thermal models by the FEA programs to simulate for an adequate thermal environment. These thermal models can be utilized for estimating the thermal responses of the TMT optics. In order to demonstrate the thermal responses, various sample time-dependent thermal loadings were modeled to synthesize the operational environment. Thermal responses of the optics were discussed and the optical consequences were evaluated.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.1117/12.789212DOIArticle
Additional Information:© 2008 Society of Photo-Optical Instrumentation Engineers (SPIE). This research was carried out at the National Optical Astronomy Observatory, and was sponsored in part by the TMT. 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. The authors would like to acknowledge Laurie Phillips of the GSMT Program Office of NOAO and Ben Platt, Curtis Baffes, Eric Williams, and Larry Stepp of the TMT Project for their review and helpful comments.
Group:Thirty Meter Telescope
Funders:
Funding AgencyGrant Number
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:thermal models, temperature distributions, thermo-elastic analysis, optical performances
Series Name:Proceedings of SPIE
Issue or Number:7017
Record Number:CaltechAUTHORS:20180802-142536671
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180802-142536671
Official Citation:Myung Cho, Andrew Corredor, Shane Pootrakul, Konstantinos Vogiatzis, George Angeli, "Thermal performance prediction of the TMT optics", Proc. SPIE 7017, Modeling, Systems Engineering, and Project Management for Astronomy III, 701716 (16 July 2008); doi: 10.1117/12.789212; https://doi.org/10.1117/12.789212
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:88531
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:02 Aug 2018 21:50
Last Modified:03 Oct 2019 20:07

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