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    Advanced structural design for precision radial velocity instruments

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    Author
    Baldwin, Dan
    Szentgyorgyi, Andrew
    Barnes, Stuart
    Bean, Jacob
    Ben-Ami, Sagi
    Brennan, Patricia
    Budynkiewicz, Jamie
    Chun, Moo-Young
    Conroy, Charlie
    Crane, Jeffrey D.
    Epps, Harland
    Evans, Ian
    Evans, Janet
    Foster, Jeff
    Frebel, Anna
    Gauron, Thomas
    Guzman, Dani
    Hare, Tyson
    Jang, Bi-Ho
    Jang, Jeong-Gyun
    Jordan, Andres
    Kim, Jihun
    Kim, Kang-Min
    Mendes de Oliveira, Claudia
    Lopez-Morales, Mercedes
    McCracken, Kenneth
    McMuldroch, Stuart
    Miller, Joseph
    Mueller, Mark
    Oh, Jae Sok
    Ordway, Mark
    Park, Byeong-Gon
    Park, Chan
    Park, Sung-Joon
    Paxson, Charles
    Phillips, David
    Plummer, David
    Podgorski, William
    Seifahrt, Andreas
    Stark, Daniel
    Steiner, Joao
    Uomoto, Alan
    Walsworth, Ronald
    Yu, Young-Sam
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    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2016-07-22
    Keywords
    Echelle spectrograph
    precision radial velocity
    G -CLEF
    GMT
    composite optical bench
    thermal stability
    mechanical stability
    low CIE
    
    Metadata
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    Publisher
    SPIE-INT SOC OPTICAL ENGINEERING
    Citation
    Dan Baldwin ; Andrew Szentgyorgyi ; Stuart Barnes ; Jacob Bean ; Sagi Ben-Ami ; Patricia Brennan ; Jamie Budynkiewicz ; Moo-Young Chun ; Charlie Conroy ; Jeffrey D. Crane ; Harland Epps ; Ian Evans ; Janet Evans ; Jeff Foster ; Anna Frebel ; Thomas Gauron ; Dani Guzman ; Tyson Hare ; Bi-Ho Jang ; Jeong-Gyun Jang ; Andres Jordan ; Jihun Kim ; Kang-Min Kim ; Claudia Mendes de Oliveira ; Mercedes Lopez-Morales ; Kenneth McCracken ; Stuart McMuldroch ; Joseph Miller ; Mark Mueller ; Jae Sok Oh ; Mark Ordway ; Byeong-Gon Park ; Chan Park ; Sung-Joon Park ; Charles Paxson ; David Phillips ; David Plummer ; William Podgorski ; Andreas Seifahrt ; Daniel Stark ; Joao Steiner ; Alan Uomoto ; Ronald Walsworth and Young-Sam Yu " Advanced structural design for precision radial velocity instruments ", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99123I (July 22, 2016); doi:10.1117/12.2235250; http://dx.doi.org/10.1117/12.2235250
    Journal
    ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION II
    Rights
    © 2016 SPIE.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    The GMT-Consortium Large Earth Finder (G-CLEF) is an echelle spectrograph with precision radial velocity (PRV) capability that will be a first light instrument for the Giant Magellan Telescope (GMT). G-CLEF has a PRV precision goal of 40 cm/sec (10 cm/s for multiple measurements) to enable detection of Earth-like exoplanets in the habitable zones of sun-like stars'. This precision is a primary driver of G-CLEF's structural design. Extreme stability is necessary to minimize image motions at the CCD detectors. Minute changes in temperature, pressure, and acceleration environments cause structural deformations, inducing image motions which degrade PRV precision. The instrument's structural design will ensure that the PRV goal is achieved under the environments G-CLEF will be subjected to as installed on the GMT azimuth platform, including: Millikelvin (0.001 K) thermal soaks and gradients 10 millibar changes in ambient pressure Changes in acceleration due to instrument tip/tilt and telescope slewing Carbon fiber/cyanate composite was selected for the optical bench structure in order to meet performance goals. Low coefficient of thermal expansion (C 1E) and high stiffness-to-weight are key features of the composite optical bench design. Manufacturability and serviceability of the instrument are also drivers of the design. In this paper, we discuss analyses leading to technical choices made to minimize G-CLEF's sensitivity to changing environments. Finite element analysis (FEA) and image motion sensitivity studies were conducted to determine PRV performance under operational environments. We discuss the design of the optical bench structure to optimize stiffness to -weight and minimize deformations due to inertial and pressure effects. We also discuss quasi-kinematic mounting of optical elements and assemblies, and optimization of these to ensure minimal image motion under thermal, pressure, and inertial loads expected during PRV observations.
    Note
    SPIE grants to authors of papers published in an SPIE Journal or Proceedings the right to post an author-prepared version or an official version (preferred version) of the published paper on an internal or external server controlled exclusively by the author/employer, provided that (a) such posting is noncommercial in nature and the paper is made available to users without charge; (b) an appropriate copyright notice and full citation appear with the paper, and (c) a link to SPIE's official online version of the abstract is provided using the DOI (Document Object Identifier) link.
    ISSN
    0277-786X
    DOI
    10.1117/12.2235250
    Version
    Final published version
    Additional Links
    http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2235250
    ae974a485f413a2113503eed53cd6c53
    10.1117/12.2235250
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