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Equipment Vibration Budget for TMT

MacMartin, Douglas G. and Thompson, Hugh (2014) Equipment Vibration Budget for TMT. In: Ground-based and Airborne Telescopes V. Proceedings of SPIE. No.9145. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 91452O. ISBN 978-0-8194-9613-3.

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Vibration from equipment mounted on the telescope and in summit support buildings has been a source of performance degradation at existing observatories, for adaptive optics performance in particular. To ensure that that the total optical performance degradation due to vibration is less than the corresponding optical error budget allocation, a vibration budget has been created that specifies allowable force levels from each source of vibration in the observatory (e.g., pumps, chillers, cryocoolers, etc.). In addition to its primary purpose, the vibration budget allows us to make design trade-offs, specify isolation requirements for equipment, and tighten or widen individual equipment vibration specifications as necessary. Defining this budget relies on two types of information: (i) vibration transmission analysis that determines the optical consequences that result from forces applied at different locations in the Observatory and at different frequencies; and (ii) initial estimates for plausible source amplitudes in order to allocate force budgets to different sources in the most realistic and cost-effective manner. The transmission of vibration from sources through to their optical consequences uses the finite element model of the telescope structure, including primary mirror segment models and control loops. Both the image jitter and higher-order deformations due to M1 segment motion are included, along with the spatial- and temporal-correctability by the adaptive optics system. Measurements to support estimates of plausible soil transmissibility are described in a companion paper. As the detailed design progresses and more information is available regarding what is achievable at realistic cost, the vibration budget will be refined.

Item Type:Book Section
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MacMartin, Douglas G.0000-0003-1987-9417
Additional Information:© 2014 SPIE. The TMT Project gratefully acknowledges the support of the TMT collaborating institutions. They are the Association of Canadian Universities for Research in Astronomy (ACURA), the California Institute of Technology, the University of California, the National Astronomical Observatory of Japan, the National Astronomical Observatories of China and their consortium partners, and the Department of Science and Technology of India and their supported institutes. 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), the U.S. National Science Foundation and the National Institutes of Natural Sciences of Japan.
Funding AgencyGrant Number
Association of Canadian Universities for Research in Astronomy (ACURA)UNSPECIFIED
University of CaliforniaUNSPECIFIED
National Astronomical Observatory of JapanUNSPECIFIED
National Astronomical Observatories of ChinaUNSPECIFIED
Department of Science and Technology of IndiaUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Canada Foundation for Innovation (CFI)UNSPECIFIED
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
National Institutes of Natural Sciences of JapanUNSPECIFIED
Subject Keywords:Vibration, Extremely Large Telescopes, Performance, Adaptive Optics
Series Name:Proceedings of SPIE
Issue or Number:9145
Record Number:CaltechAUTHORS:20150615-102448138
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Official Citation:Douglas G. MacMartin ; Hugh Thompson; Equipment vibration budget for the TMT. Proc. SPIE 9145, Ground-based and Airborne Telescopes V, 91452O (July 22, 2014); doi:10.1117/12.2057179
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58242
Deposited By: Tony Diaz
Deposited On:15 Jun 2015 17:42
Last Modified:10 Nov 2021 22:01

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