Mr. Mark P. Ordway Profile

Mark P. Ordway

at Harvard-Smithsonian Ctr for Astrophysics

SPIE Involvement:

Author

Publications (17)

Proceedings Article | 9 August 2016 Paper

Paper

The GMT-Consortium Large Earth Finder (G-CLEF): an optical Echelle spectrograph for the Giant Magellan Telescope (GMT)

Andrew Szentgyorgyi, Daniel Baldwin, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Dani Guzmán, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andres Jordan, Jihun Kim, Kang-Miin Kim, Claudia Mendes Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Mark Mueller, Jae Sok Oh, Cem Onyuksel, 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, Young-Sam Yu

Proceedings Volume 9908, 990822 (2016) https://doi.org/10.1117/12.2233506

KEYWORDS: Spectrographs, Telescopes, Cameras, Calibration, Lamps, Interfaces, Fiber science, Light sources, Optical design, Mirrors

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Proceedings Article | 9 August 2016 Paper

Paper

The opto-mechanical design of the GMT-Consortium Large Earth Finder (G-CLEF)

Mark Mueller, Andrew Szentgyorgyi, Daniel Baldwin, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, J. Budynkiewicz, Moo-Yung Chun, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Jeff Foster, Anna Frebel, Thomas Gauron, Alex Glenday, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Andreas Jordan, Jihun Kim, Kang-Min Kim, Claudia Mendes de Oliveira, Mercedes Lopez-Morales, Kenneth McCracken, Stuart McMuldroch, Joseph Miller, Jae Sok Oh, Cem Onyuksel, Mark Ordway, Chan Park, Sung-Joon Park, Charles Paxson, David Phillips, David Plummer, William Podgorski, Andreas Seifahrt, Joao Steiner, Alan Uomoto, Ronald Walsworth, Young-Sam Yu

Proceedings Volume 9908, 9908A2 (2016) https://doi.org/10.1117/12.2233246

KEYWORDS: Spectrographs, Telescopes, Optical mounts, Space telescopes, Cameras, Calibration, Temperature metrology, Control systems, Mirrors, Optical benches

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The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber-fed, optical echelle spectrograph selected as the first light instrument for the Giant Magellan Telescope (GMT) now under construction at the Las Campanas Observatory in Chile. G-CLEF has been designed to be a general-purpose echelle spectrograph with precision radial velocity (PRV) capability for exoplanet detection. The radial velocity (RV) precision goal of G-CLEF is 10 cm/sec, necessary for detection of Earth-sized exoplanets. This goal imposes challenging stability requirements on the optical mounts and the overall spectrograph support structures especially when considering the instrument’s operational environment. The accuracy of G-CLEF’s PRV measurements will be influenced by minute changes in temperature and ambient air pressure as well as vibrations and micro gravity-vector variations caused by normal telescope slewing. For these reasons we have chosen to enclose G-CLEF’s spectrograph in a well-insulated, vibration isolated vacuum chamber in a gravity invariant location on GMT’s azimuth platform. Additional design constraints posed by the GMT telescope include: a limited space envelope, a thermal emission ceiling, and a maximum weight allowance. Other factors, such as manufacturability, serviceability, available technology and budget are also significant design drivers. All of the above considerations must be managed while ensuring performance requirements are achieved. In this paper, we discuss the design of G-CLEF’s optical mounts and support structures including the choice of a low coefficient of thermal expansion (CTE) carbon-fiber optical bench to minimize the system’s sensitivity to thermal soaks and gradients. We discuss design choices made to the vacuum chamber geared towards minimize the influence of daily ambient pressure variations on image motion during observation. We discuss the design of G-CLEF’s insulated enclosure and thermal control systems which will maintain the spectrograph at milli-Kelvin level stability while simultaneously limiting thermal emissions into the telescope dome. Also discussed are micro gravity-vector variations caused by normal telescope slewing, their uncorrected influence on image motion, and how they are dealt with in the design. Finally, we discuss G-CLEF’s front-end assembly and fiber-feed system as well as other interface challenges presented by the telescope, enclosure and neighboring instrumentation.

Proceedings Article | 22 July 2016 Paper

Paper

Advanced structural design for precision radial velocity instruments

Dan Baldwin, Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Sagi Ben-Ami, Patricia Brennan, Jamie Budynkiewicz, Moo-Young Chun, Charlie Conroy, Jeffrey 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, Young-Sam Yu

Proceedings Volume 9912, 99123I (2016) https://doi.org/10.1117/12.2235250

KEYWORDS: Optical benches, Spectrographs, Optical design, Composites, Telescopes, Structural design, Finite element methods, Thermography, Sensors, Optical components

Read 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 stars¹. 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 (CTE) 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.

Proceedings Article | 6 August 2014 Paper

Paper

The opto-mechanical design of the GMT-consortium large earth finder (G-CLEF)

Mark Mueller, Daniel Baldwin, Jacob Bean, Henry Bergner, Bruce Bigelow, Moo-Young Chun, Jeffrey Crane, Jeff Foster, Gabor Fűrész, Thomas Gauron, Dani Guzman, Edward Hertz, Andrés Jordán, Kang-Min Kim, Kenneth McCracken, Timothy Norton, Mark Ordway, Chan Park, Sang Park, William Podgorski, Andrew Szentgyorgyi, Alan Uomoto, In-Soo Yuk

Proceedings Volume 9147, 91479A (2014) https://doi.org/10.1117/12.2056440

KEYWORDS: Spectrographs, Space telescopes, Telescopes, Cameras, Optical mounts, Composites, Temperature metrology, Mirrors, Control systems, Optical benches

Read Abstract +

The GMT-Consortium Large Earth Finder (G-CLEF) is a fiber fed, optical echelle spectrograph that has been selected as a first light instrument for the Giant Magellan Telescope (GMT) currently under construction at the Las Campanas Observatory in Chile’s Atacama desert region. We designed G-CLEF as a general-purpose echelle spectrograph with precision radial velocity (PRV) capability used for exoplanet detection. The radial velocity (RV) precision goal of GCLEF is 10 cm/sec, necessary for detection of Earth-sized planets orbiting stars like our Sun in the habitable zone. This goal imposes challenging stability requirements on the optical mounts and the overall spectrograph support structures. Stability in instruments of this type is typically affected by changes in temperature, orientation, and air pressure as well as vibrations caused by telescope tracking. For these reasons, we have chosen to enclose G-CLEF’s spectrograph in a thermally insulated, vibration isolated vacuum chamber and place it at a gravity invariant location on GMT’s azimuth platform. Additional design constraints posed by the GMT telescope include: a limited space envelope, a thermal emission ceiling, and a maximum weight allowance. Other factors, such as manufacturability, serviceability, available technology and budget are also significant design drivers. All of the previously listed considerations must be managed while ensuring that performance requirements are achieved. In this paper, we discuss the design of G-CLEF’s optical mounts and support structures including technical choices made to minimize the system’s sensitivity to thermal gradients. A more general treatment of the properties of G-CLEF can be found elsewhere in these proceedings1. We discuss the design of the vacuum chamber which houses the irregularly shaped optical bench and optics while conforming to a challenging space envelope on GMT’s azimuth platform. We also discuss the design of G-CLEF’s insulated enclosure and thermal control systems which maintain the spectrograph at milli-Kelvin level stability while simultaneously limiting the maximum thermal emission into the telescope dome environment. Finally, we discuss G-CLEF’s front-end assembly and fiber-feed system as well as other interface challenges presented by the telescope, enclosure and neighboring instrumentation.

Proceedings Article | 28 July 2014 Paper

Paper

A preliminary design for the GMT-Consortium Large Earth Finder (G-CLEF)

Andrew Szentgyorgyi, Stuart Barnes, Jacob Bean, Bruce Bigelow, Antonin Bouchez, Moo-Young Chun, Jeffrey Crane, Harland Epps, Ian Evans, Janet Evans, Anna Frebel, Gabor Furesz, Alex Glenday, Dani Guzman, Tyson Hare, Bi-Ho Jang, Jeong-Gyun Jang, Ueejong Jeong, Andres Jordan, Kang-Min Kim, Jihun Kim, Chih-Hao Li, Mercedes Lopez-Morales, Kenneth McCracken, Brian McLeod, Mark Mueller, Jakyung Nah, Timothy Norton, Heeyoung Oh, Jae Sok Oh, Mark Ordway, Byeong-Gon Park, Chan Park, Sung-Joon Park, David Phillips, David Plummer, William Podgorski, Florian Rodler, Andreas Seifahrt, Kyung-Mo Tak, Alan Uomoto, Marcos Van Dam, Ronald Walsworth, Young Sam Yu, In-Soo Yuk

Proceedings Volume 9147, 914726 (2014) https://doi.org/10.1117/12.2056741

KEYWORDS: Spectrographs, Telescopes, Stars, Mirrors, Calibration, Exoplanets, Adaptive optics, Cameras, Interfaces, Optical design

Read Abstract +

Proceedings Article | 28 July 2014 Paper

Paper

The G-CLEF spectrograph optical design

Gábor Fűrész, Harland Epps, Stuart Barnes, William Podgorski, Andrew Szentgyorgyi, Mark Mueller, Daniel Baldwin, Jacob Bean, Henry Bergner, Moo-Young Chun, Jeffrey Crane, Janet Evans, Ian Evans, Jeff Foster, Thomas Gauron, Dani Guzman, Edward Hertz, Andres Jordán, Kang-Min Kim, Kenneth McCracken, Timothy Norton, Mark Ordway, Chan Park, Sang Park, Dave Plummer, Alan Uomoto, In-Soo Yuk

Proceedings Volume 9147, 91479G (2014) https://doi.org/10.1117/12.2057153

KEYWORDS: Mirrors, Spectrographs, Cameras, Collimators, Optical design, Telescopes, Point spread functions, Sensors, Observatories, Spectral resolution

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Proceedings Article | 22 July 2014 Paper

Paper

The Giant Magellan Telescope active optics system

Brian McLeod, Antonin Bouchez, Brady Espeland, José Filgueira, Matt Johns, Timothy Norton, Mark Ordway, William Podgorski, John Roll, Carey Smith

Proceedings Volume 9145, 91451T (2014) https://doi.org/10.1117/12.2056435

KEYWORDS: Mirrors, Telescopes, Wavefront sensors, Active optics, Image segmentation, Sensors, Adaptive optics, Actuators, Stars, Wavefronts

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Proceedings Article | 19 October 2012 Paper

Paper

Minimizing the mirror distortion for subarcsecond imaging in the Hi-C EUV telescope

William Podgorski, David Caldwell, Kenneth McCracken, Mark Ordway, Peter Cheimets, Kelly Korreck, Leon Golub, Jonathan Cirtain, Ken Kobayashi

Proceedings Volume 8502, 85020E (2012) https://doi.org/10.1117/12.930610

KEYWORDS: Telescopes, Mirrors, Space telescopes, Rockets, Distortion, Extreme ultraviolet, Image resolution, Interferometers, Secondary tip-tilt mirrors, Interfaces

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Proceedings Article | 5 October 2012 Paper

Paper

The GMT-CfA, Carnegie, Catolica, Chicago Large Earth Finder (G-CLEF): a general purpose optical echelle spectrograph for the GMT with precision radial velocity capability

A. Szentgyorgyi, A. Frebel, G. Furesz, E. Hertz, T. Norton, J. Bean, H. Bergner, J. Crane, J. Evans, I. Evans, T. Gauron, A. Jordán, S. Park, A. Uomoto, S. Barnes, W. Davis, M. Eisenhower, H. Epps, D. Guzman, K. McCracken, M. Ordway, D. Plummer, W. Podgorski, D. Weaver

Proceedings Volume 8446, 84461H (2012) https://doi.org/10.1117/12.924957

KEYWORDS: Spectrographs, Cameras, Telescopes, Calibration, Optical design, Interfaces, Molybdenum, Lenses, Charge-coupled devices, Mirrors

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Proceedings Article | 24 September 2012 Paper

Paper

Harps-N: the new planet hunter at TNG

Rosario Cosentino, Christophe Lovis, Francesco Pepe, Andrew Collier Cameron, David Latham, Emilio Molinari, Stephane Udry, Naidu Bezawada, Martin Black, Andy Born, Nicolas Buchschacher, Dave Charbonneau, Pedro Figueira, Michel Fleury, Alberto Galli, Angus Gallie, Xiaofeng Gao, Adriano Ghedina, Carlos Gonzalez, Manuel Gonzalez, Jose Guerra, David Henry, Keith Horne, Ian Hughes, Dennis Kelly, Marcello Lodi, David Lunney, Charles Maire, Michel Mayor, Giusi Micela, Mark Ordway, John Peacock, David Phillips, Giampaolo Piotto, Don Pollacco, Didier Queloz, Ken Rice, Carlos Riverol, Luis Riverol, Jose San Juan, Dimitar Sasselov, Damien Segransan, Alessandro Sozzetti, Danuta Sosnowska, Brian Stobie, Andrew Szentgyorgyi, Andy Vick, Luc Weber

Proceedings Volume 8446, 84461V (2012) https://doi.org/10.1117/12.925738

KEYWORDS: Calibration, Spectrographs, Optical fibers, Charge-coupled devices, Telescopes, Stars, Sensors, Control systems, Lamps, Planets

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Proceedings Article | 24 September 2012 Paper

Paper

The F/5 instrumentation suite for the Clay Telescope

A. Szentgyorgyi, B. McLeod, D. Fabricant, R. Fata, T. Norton, M. Ordway, J. Roll, H. Bergner, M. Conroy, D. Curley, H. Epps, T. Gauron, J. Geary, M. Mueller, A. Uomoto, S. Amato, J. Barberis, R. Eng, G. Furesz, E. Hertz, C. Hull, K. McCracken, G. Nystrom, D. Osip, P. Palunas, F. Perez, F. Sanchez, V. Suc, D. Weaver, D. Woods

Proceedings Volume 8446, 844628 (2012) https://doi.org/10.1117/12.925510

KEYWORDS: Telescopes, Wavefront sensors, Mirrors, Charge-coupled devices, Space telescopes, Interfaces, Observatories, Lanthanum, Camera shutters, Optical instrument design

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Proceedings Article | 13 September 2012 Paper

Paper

The Giant Magellan Telescope adaptive optics program

Antonin Bouchez, D. Scott Acton, Guido Agapito, Carmelo Arcidiacono, Francis Bennet, Valdemaro Biliotti, Marco Bonaglia, Runa Briguglio, Guido Brusa-Zappellini, Lorenzo Busoni, Luca Carbonaro, Johanan Codona, Rodolphe Conan, Thomas Connors, Oliver Durney, Brady Espeland, Simone Esposito, Luca Fini, Rusty Gardhouse, Thomas Gauron, Michael Hart, Philip Hinz, Srikrishna Kanneganti, Edward Kibblewhite, Russell Knox, Brian McLeod, Thomas McMahon, Manny Montoya, Timothy Norton, Mark Ordway, Celine d'Orgeville, Simon Parcell, Piotr Piatrou, Enrico Pinna, Ian Price, Alfio Puglisi, Fernando Quiros-Pacheco, Armando Riccardi, John Roll, Gelys Trancho, Kristina Uhlendorf, Vidhya Vaitheeswaran, Marcos van Dam, David Weaver, Marco Xompero

Proceedings Volume 8447, 84471I (2012) https://doi.org/10.1117/12.926691

KEYWORDS: Adaptive optics, Wavefront sensors, Telescopes, Mirrors, Sensors, Laser guide stars, Wavefronts, Tomography, Calibration, Atmospheric optics

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Proceedings Article | 13 September 2012 Paper

Paper

A prototype phasing camera for the Giant Magellan Telescope

Srikrishna Kanneganti, Brian McLeod, Mark Ordway, John Roll, Stephen Shectman, Antonin Bouchez, Johanan Codona, Roger Eng, Thomas Gauron, Felix Handte, Timothy Norton, Phil Streechon, David Weaver

Proceedings Volume 8447, 844752 (2012) https://doi.org/10.1117/12.926517

KEYWORDS: Telescopes, Mirrors, Cameras, Image segmentation, Prototyping, Microelectromechanical systems, Sensors, Stars, Relays, Adaptive optics

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Proceedings Article | 9 July 2008 Paper

Paper

Deploying comb and tunable lasers to enable precision radial velocity surveys

Andrew Szentgyorgyi, Claire Cramer, Andrew Benedick, Alexander Glenday, Franz Kaertner, Sylvain Korzennik, Chih-Hao Li, Mark Ordway, David Phillips, Dimitar Sasselov, Ronald Walsworth

Proceedings Volume 7014, 70141W (2008) https://doi.org/10.1117/12.789577

KEYWORDS: Calibration, Spectrographs, Lamps, Tunable lasers, Fabry–Perot interferometers, Telescopes, Astronomical imaging, Laser development, Precision calibration, Astronomy

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Proceedings Article | 30 September 2004 Paper

Paper

The 6.5-m MMT's f/5 wide-field optics and instruments

Daniel Fabricant, Robert Fata, Brian McLeod, Andrew Szentgyorgyi, J. Barberis, Henry Bergner, Warren Brown, Nelson Caldwell, Maureen Conroy, Roger Eng, Harland Epps, G. Furesz, Tom Gauron, John Geary, Richard Goddard, Lee Hartmann, Edward Hertz, M. Honsa, Mark Mueller, Timothy Norton, Mark Ordway, John Roll, G. Grant Williams, Deborah Freedman-Woods, Joe Zajac

Proceedings Volume 5492, (2004) https://doi.org/10.1117/12.551729

KEYWORDS: Optical fibers, Spectrographs, Stars, Charge-coupled devices, Telescopes, Mirrors, Imaging spectroscopy, Glasses, Spectroscopes, Wavefront sensors

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Proceedings Article | 9 July 1998 Paper

Paper

Megacam: paving the focal plane of the MMT with silicon

Brian McLeod, Tom Gauron, John Geary, Mark Ordway, John Roll

Proceedings Volume 3355, (1998) https://doi.org/10.1117/12.316779

KEYWORDS: Charge-coupled devices, Telescopes, Monochromatic aberrations, Camera shutters, Cameras, Stars, CCD cameras, Silicon, Mirrors, Electronics

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Proceedings Article | 11 July 1997 Paper

Paper

High-speed imager AXAF calibration microchannel plate detector

Ian Evans, Edwin Kellogg, Walter McDermott, Mark Ordway, J. Rosenberg, Bradford Wargelin

Proceedings Volume 3113, (1997) https://doi.org/10.1117/12.278848

KEYWORDS: Microchannel plates, Calibration, Sensors, Imaging systems, Electronics, X-rays, Quantum efficiency, Ions, X-ray detectors, Spatial resolution

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Showing 5 of 17 publications

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