Advanced structural design for precision radial velocity instruments
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...
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Echelle spectrograph precision radial velocity G -CLEF GMT composite optical bench thermal stability mechanical stability low CIE |
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Echelle spectrograph precision radial velocity G -CLEF GMT composite optical bench thermal stability mechanical stability low CIE 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 Advanced structural design for precision radial velocity instruments |
description |
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. |
author2 |
Univ Arizona, Steward Observ |
author_facet |
Univ Arizona, Steward Observ 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 |
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 |
author_sort |
Baldwin, Dan |
title |
Advanced structural design for precision radial velocity instruments |
title_short |
Advanced structural design for precision radial velocity instruments |
title_full |
Advanced structural design for precision radial velocity instruments |
title_fullStr |
Advanced structural design for precision radial velocity instruments |
title_full_unstemmed |
Advanced structural design for precision radial velocity instruments |
title_sort |
advanced structural design for precision radial velocity instruments |
publisher |
SPIE-INT SOC OPTICAL ENGINEERING |
publishDate |
2016 |
url |
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 http://hdl.handle.net/10150/622418 http://arizona.openrepository.com/arizona/handle/10150/622418 |
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ndltd-arizona.edu-oai-arizona.openrepository.com-10150-6224182017-02-05T03:00:33Z Advanced structural design for precision radial velocity instruments 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 Univ Arizona, Steward Observ Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) The Univ. of Chicago (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Korea Astronomy and Space Science Institute (Korea, Republic of) Harvard-Smithsonian Ctr. for Astrophysics (United States) The Observatories of the Carnegie Institute for Science (United States) Univ. of California, Santa Cruz (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Kavli Institute for Astrophysics and Space Research (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Pontificia Univ. Católica de Chile (Chile) The Observatories of the Carnegie Institution of Science (United States) Korea Astronomy and Space Science Institute (Korea, Republic of) Korea Astronomy and Space Science Institute (Korea, Republic of) Pontificia Univ. Católica de Chile (Chile) Korea Astronomy and Space Science Institute (Korea, Republic of) Korea Astronomy and Space Science Institute (Korea, Republic of) Univ. de São Paulo (Brazil) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Korea Astronomy and Space Science Institute (Korea, Republic of) Harvard-Smithsonian Ctr. for Astrophysics (United States) Korea Astronomy and Space Science Institute (Korea, Republic of) Korea Astronomy and Space Science Institute (Korea, Republic of) Korea Astronomy and Space Science Institute (Korea, Republic of) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) The Univ. of Chicago (United States) The Univ. of Arizona (United States) Univ. de São Paulo (Brazil) The Observatories of the Carnegie Institution for Science (United States) Harvard-Smithsonian Ctr. for Astrophysics (United States) Korea Astronomy and Space Science Institute (Korea, Republic of) Echelle spectrograph precision radial velocity G -CLEF GMT composite optical bench thermal stability mechanical stability low CIE 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. 2016-07-22 Article 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 0277-786X 10.1117/12.2235250 http://hdl.handle.net/10150/622418 http://arizona.openrepository.com/arizona/handle/10150/622418 ADVANCES IN OPTICAL AND MECHANICAL TECHNOLOGIES FOR TELESCOPES AND INSTRUMENTATION II en http://proceedings.spiedigitallibrary.org/proceeding.aspx?doi=10.1117/12.2235250 © 2016 SPIE SPIE-INT SOC OPTICAL ENGINEERING |