Dr. Larry D. Dewell Profile

Dr. Larry D. Dewell

SPIE Involvement:

Author

Publications (17)

SPIE Journal Paper | 23 September 2022 Open Access

Open Access

Adaptive optics performance of a simulated coronagraph instrument on a large, segmented space telescope in steady state

Axel Potier, Garreth Ruane, Chris Stark, Pin Chen, Ankur Chopra, Larry Dewell, Roser Juanola-Parramon, Alison Nordt, Laurent Pueyo, David Redding, A J Eldorado Riggs, Dan Sirbu

JATIS, Vol. 8, Issue 03, 035002, (September 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.035002

KEYWORDS: Adaptive optics, Coronagraphy, Telescopes, Wavefronts, Stars, Device simulation, Wavefront sensors, Equipment, Optical path differences, Wavefront errors

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Proceedings Article | 27 August 2022 Presentation + Paper

Presentation + Paper

Line-of-sight and wavefront error dynamic stability during coronagraphic imaging for a 6.7-meter inscribed diameter UVOIR segmented telescope with non-contact pointing and vibration isolation

Kiarash Tajdaran, Larry Dewell, Michael Jacoby, Alison Nordt, John Lou

Proceedings Volume 12180, 121802L (2022) https://doi.org/10.1117/12.2630343

KEYWORDS: Control systems, Space operations, Actuators, Interfaces, Sensors, Observatories, Performance modeling, Wavefronts, Coronagraphy, Telescopes

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The Ultraviolet/Optical/Infrared (UVOIR) flagship astrophysics architectures proposed by the Astro2020 Decadal Survey fundamentally challenge the current test-like-you-fly approach to space systems, because of their physical scale, multiple stages of on-orbit deployment, and extremely stringent optical performance requirements unique to visible-light coronagraphy. These limitations elevate the importance of integrated control, structural dynamics, and optical modeling, particularly in early system architecture studies. A unique non-contact observatory control architecture called Disturbance Free Payload (DFP) for next-generation large astrophysics observatories involves physically isolating the segmented telescope structure from the supporting spacecraft by means of a non-contact interface. In this control architecture, rigidbody telescope pointing is achieved by actuating the payload with non-contact voice coil actuators and maintaining positive interface gaps using spacecraft inertial actuators and interface non-contact sensors. This architecture presents distinct advantages over current state-of-the-art spacecraft vibration isolation approaches, particularly for large flexible spacecraft, but also introduces unique disturbance and coupling mechanisms that must be analyzed. In this paper, development of an integrated model is described, consisting of a 6.7-meter inscribed segmented optical system, and an unobscured telescope with 55 primary mirror segments. The paper starts with an overview of the models that directly predict time-domain lineof-sight and wavefront error dynamic stability (optics, dynamics, control system, error sources). Next, key dynamic stability performance metrics for coronagraph contrast performance are described and a systematic methodology for realizing an accurate but computationally feasible truncated modal model is presented. Finally, an exemplar point design that is compliant to 10-picometer RMS wavefront error is developed, and the necessary component errors to achieve this performance are presented.

Proceedings Article | 27 August 2022 Poster + Paper

Poster + Paper

Contrast performance of an 8m off-axis, segmented space telescope equipped with an adaptive optics system

Axel Potier, Garreth Ruane, Kiarash Tajdaran, Chris Stark, Pin Chen, Larry Dewell, Roser Juanola-Parramon, Alison Nordt, Laurent Pueyo, A.J. Eldorado Riggs, David Redding, Dan Sirbu

Proceedings Volume 12180, 121805D (2022) https://doi.org/10.1117/12.2629902

KEYWORDS: Coronagraphy, Adaptive optics, Telescopes, Stars, Image segmentation, Wavefront sensors, Space telescopes, Performance modeling, Wavefronts, Mirrors

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Proceedings Article | 3 September 2021 Presentation + Paper

Presentation + Paper

LUVOIR-ECLIPS closed-loop adaptive optics performance and contrast predictions

Axel Potier, Garreth Ruane, Pin Chen, Ankur Chopra, Larry Dewell, Roser Juanola Parramon, Alison Nordt, Laurent Pueyo, David Redding, AJ Eldorado Riggs, Dan Sirbu

Proceedings Volume 11823, 118231L (2021) https://doi.org/10.1117/12.2595116

KEYWORDS: Adaptive optics, Wavefronts, Wavefront sensors, Telescopes, Principal component analysis, Coronagraphy, Exoplanets

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SPIE Journal Paper | 13 March 2021 Open Access

Open Access

Origins Space Telescope: trades and decisions leading to the baseline mission concept

David Leisawitz, Edward Amatucci, Lynn Allen, Jonathan Arenberg, Lee Armus, Cara Battersby, James Bauer, Ray Bell, Dominic Benford, Edwin Bergin, Jeffrey Booth, Charles Bradford, Damon Bradley, Sean Carey, Ruth Carter, Asantha Cooray, James Corsetti, Larry Dewell, Michael DiPirro, Bret Drake, Matthew East, Kimberly Ennico, Greg Feller, Angel Flores, Jonathan Fortney, Zachary Granger, Thomas Greene, Joseph Howard, Tiffany Kataria, John Knight, Charles Lawrence, Paul Lightsey, John Mather, Margaret Meixner, Gary Melnick, Craig McMurtry, Stefanie Milam, Samuel Moseley, Desika Narayanan, Alison Nordt, Deborah Padgett, Klaus Pontoppidan, Alexandra Pope, Gerard Rafanelli, David Redding, George Rieke, Thomas Roellig, Itsuki Sakon, Carly Sandin, Karin Sandstrom, Anita Sengupta, Kartik Sheth, Lawrence Sokolsky, Johannes Staguhn, John Steeves, Kevin Stevenson, Kate Su, Joaquin Vieira, Cassandra Webster, Martina Wiedner, Edward Wright, Chi Wu, David Yanatsis, Jonas Zmuidzinas, the Origins Space Telescope Mission Concept Study Team

JATIS, Vol. 7, Issue 01, 011014, (March 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.011014

KEYWORDS: Space telescopes, Telescopes, James Webb Space Telescope, Mirrors, Optical instrument design, Astronomy, Space operations, Cryogenics, Aerospace engineering, Cryocoolers

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SPIE Journal Paper | 6 January 2021 Open Access

Open Access

Origins Space Telescope: baseline mission concept

Edward Amatucci, Lynn Allen, Jonathan Arenberg, Lee Armus, Cara Battersby, James Bauer, Porfirio Beltran, Dominic Benford, Denis Burgarella, Ruth Carter, Danny Chi, Asantha Cooray, James Corsetti, Elvire De Beck, Larry Dewell, Michael DiPirro, Matthew East, Samantha Edgington, Kimberly Ennico, Louis Fantano, David Folta, Joseph Generie, Zachary Granger, Thomas Greene, Alex Griffiths, George Harpole, Frank Helmich, Joseph Howard, Tracee Jamison, Lisa Kaltenegger, Tiffany Kataria, Charles Lawrence, Margaret Meixner, Ted Mooney, Samuel Moseley, Susan Neff, Thanh Nguyen, Alison Nordt, Michael Petach, Susanna Petro, Alexandra Pope, Daniel Ramspacker, Alison Rao, Itsuki Sakon, Karin Sandstrom, Douglas Scott, Lenward Seals, Kartik Sheth, Steven Tompkins, Cassandra Webster, Martina Wiedner, Edward Wright, Chi Wu, Jonas Zmuidzinas, David Leisawitz, Bob Beaman, Raymond Bell, Edward Bergin, Jeffrey Bolognese, Charles Bradford, Damon Bradley, Sean Carey, Tom D'Asto, Kevin Denis, Christopher Derkacz, C. Paul Earle, Gregory Feller, Jonathan Fortney, Benjamin Gavares, Maryvonne Gerin, Keith Harvey, Lawrence Hilliard, Michael Jacoby, Anisa Jamil, J. Scott Knight, Perry Knollenberg, Paul Lightsey, Sarah Lipscy, Eric Mamajek, Gregory Martins, John Mather, Gary Melnick, Stefanie Milam, Desika Narayanan, Jeffrey Olson, Deborah Padgett, John Pohner, Klaus Pontoppidan, Thomas Roellig, Carly Sandin, Larry Sokolsky, Johannes Staguhn, John Steeves, Kevin Stevenson, Eric Stoneking, Kate Su, Kiarash Tajdaran, Joaquin Vieira

JATIS, Vol. 7, Issue 01, 011002, (January 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.011002

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Poster + Presentation + Paper

Non-contact vibration isolation technology demonstration on a CubeSat

Alison Nordt, Larry Dewell, Rodrigo Zeledon, Margaret Shaw-Lecerf, Matthew Gilbertson, Kiarash Tajdaran, Alexander Sireci, Alex Petrovsky, Alyssa Ruiz

Proceedings Volume 11443, 1144332 (2020) https://doi.org/10.1117/12.2563019

KEYWORDS: Vibration isolation, Telescopes, Space telescopes, Astronomy, Exoplanets, Actuators, Control systems, Space operations, Integrated modeling

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Proceedings Article | 9 September 2019 Presentation + Paper

Presentation + Paper

Dynamic wavefront error and line-of-sight performance predictions for the 15-meter segmented Large Ultraviolet/Optical/Infrared Surveyor (LUVOIR) with non-contact vibration isolation

Larry Dewell, Alison Nordt, Ankur Chopra, Matthew Bolcar, Julie Crooke, Michael Jacoby, Kiarash Tajdaran, Torben Andersen

Proceedings Volume 11115, 111150S (2019) https://doi.org/10.1117/12.2528190

KEYWORDS: Wavefronts, Vibration isolation, Mirrors, Coronagraphy, Observatories, Image segmentation, Imaging systems, Control systems, Integrated modeling, Performance modeling

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Proceedings Article | 9 September 2019 Open Access

Open Access

Paper

The Origins Space Telescope

D. Leisawitz, E. Amatucci, L. Allen, J. Arenberg, L. Armus, C. Battersby, B. Beaman, J. Bauer, R. Bell, P. Beltran, D. Benford, E. Bergin, J. Bolognese, C. Bradford, D. Bradley, D. Burgarella, S. Carey, R. Carter, J. Chi, A. Cooray, J. Corsetti, T. D'Asto, E. De Beck, K. Denis, C. Derkacz, L. Dewell, M. DiPirro, C. P. Earle, M. East, S. Edgington, K. Ennico, L. Fantano, G. Feller, A. Flores, D. Folta, J. Fortney, B. Gavares, J. Generie, M. Gerin, Z. Granger, T. Greene, A. Griffiths, G. Harpole, K. Harvey, F. Helmich, G. Helou, L. Hilliard, J. Howard, M. Jacoby, A. Jamil, T. Jamison, L. Kaltenegger, T. Kataria, J. S. Knight, P. Knollenberg, C. Lawrence, P. Lightsey, S. Lipscy, C. Lynch, E. Mamajek, G. Martins, J. Mather, M. Meixner, G. Melnick, S. Milam, T. Mooney, S. Moseley, D. Narayanan, S. Neff, T. Nguyen, A. Nordt, J. Olson, D. Padgett, M. Petach, S. Petro, J. Pohner, K. Pontoppidan, A. Pope, D. Ramspacher, A. Rao, G. Rieke, M. Rieke, T. Roellig, I. Sakon, C. Sandin, K. Sandstrom, D. Scott, L. Seals, K. Sheth, J. Staguhn, J. Steeves, K. Stevenson, L. Stokowski, E. Stoneking, K. Su, K. Tajdaran, S. Tompkins, J. Turner, J. Vieira, C. Webster, M. Wiedner, E. Wright, C. Wu, J. Zmuidzinas

Proceedings Volume 11115, 111150Q (2019) https://doi.org/10.1117/12.2530514

KEYWORDS: Galactic astronomy, Planets, Stars, Telescopes, Astronomy, James Webb Space Telescope, Sensors, Space telescopes, Exoplanets, Observatories

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Proceedings Article | 24 July 2018 Presentation + Paper

Presentation + Paper

The Origins Space Telescope: mission concept overview

D. Leisawitz, E. Amatucci, R. Carter, M. DiPirro, A. Flores, J. Staguhn, C. Wu, L. Allen, J. Arenberg, L. Armus, C. Battersby, J. Bauer, R. Bell, P. Beltran, D. Benford, E. Bergin, C. Bradford, D. Bradley, D. Burgarella, S. Carey, D. Chi, A. Cooray, J. Corsetti, E. De Beck, K. Denis, L. Dewell, M. East, S. Edgington, K. Ennico, L. Fantano, G. Feller, D. Folta, J. Fortney, J. Generie, M. Gerin, Z. Granger, G. Harpole, K. Harvey, F. Helmich, L. Hilliard, J. Howard, M. Jacoby, A. Jamil, T. Kataria, S. Knight, P. Knollenberg, P. Lightsey, S. Lipscy, E. Mamajek, G. Martins, M. Meixner, G. Melnick, S. Milam, T. Mooney, S. Moseley, D. Narayanan, S. Neff, T. Nguyen, A. Nordt, J. Olson, D. Padgett, M. Petach, S. Petro, J. Pohner, K. Pontoppidan, A. Pope, D. Ramspacher, T. Roellig, I. Sakon, C. Sandin, K. Sandstrom, D. Scott, K. Sheth, J. Steeves, K. Stevenson, L. Stokowski, E. Stoneking, K. Su, K. Tajdaran, S. Tompkins, J. Vieira, C. Webster, M. Wiedner, E. Wright, J. Zmuidzinas

Proceedings Volume 10698, 1069815 (2018) https://doi.org/10.1117/12.2313823

KEYWORDS: Space telescopes, Telescopes, Spectroscopy, Sensors, Mirrors, Astrophysics, Astronomy, James Webb Space Telescope, Aerospace engineering, Cryocoolers

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Proceedings Article | 16 July 2018 Paper

Paper

Preliminary jitter stability results for the large UV/optical/infrared (LUVOIR) surveyor concept using a non-contact vibration isolation and precision pointing system

Lia Sacks, Carl Blaurock, Larry Dewell, Kiarash Tajdaran, Kuo-Chia Liu, Christine Collins, Garrett West, Kong Ha, Matthew Bolcar, Julie Crooke, Jason Hylan, Raymond Bell

Proceedings Volume 10698, 1069842 (2018) https://doi.org/10.1117/12.2313762

KEYWORDS: Mirrors, Space operations, Control systems, Interfaces, Space telescopes, Finite element methods, Performance modeling, Wavefronts, Telescopes, Error analysis

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Proceedings Article | 12 July 2018 Paper

Paper

Telescope line-of-sight slew control and agility with non-contact vibration isolation for the large ultraviolet/optical/infrared (LUVOIR) surveyor concept

Kiarash Tajdaran, Larry Dewell, Eric Eason, Raymond Bell, Kuo-Chia Liu, Matthew Bolcar, Lia Sacks, Julie Crooke, Carl Blaurock

Proceedings Volume 10698, 106983Y (2018) https://doi.org/10.1117/12.2313644

KEYWORDS: Actuators, Space operations, Space telescopes, Telescopes, Computer architecture, Observatories, Sensors, Vibration isolation, Device simulation, Error analysis

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Proceedings Article | 5 September 2017 Presentation + Paper

Presentation + Paper

Dynamic stability with the disturbance-free payload architecture as applied to the Large UV/Optical/Infrared (LUVOIR) Mission

Larry Dewell, Kiarash Tajdaran, Raymond Bell, Kuo-Chia Liu, Matthew Bolcar, Lia Sacks, Julie Crooke, Carl Blaurock

Proceedings Volume 10398, 103980B (2017) https://doi.org/10.1117/12.2274287

KEYWORDS: Space telescopes, Vibration isolation, Space operations, Large telescopes, Infrared telescopes, Wavefronts, Telescopes, Imaging systems, Ultraviolet radiation, UV optics

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Proceedings Article | 29 May 2013 Paper

Paper

Adaptive optics for fiber-fed interferometers

Michael Hart, Thomas Stalcup, Olivier Durney, Nicholas Emerson, Keith Powell, Michael Ward, Greg Feller, Rick Kendrick, James Mason, Matthew Bold, Larry Dewell, Tracy Kubo

Proceedings Volume 8725, 87250U (2013) https://doi.org/10.1117/12.2018046

KEYWORDS: Adaptive optics, Telescopes, Interferometers, Cameras, Sensors, Mirrors, Space telescopes, Beam splitters, Image quality, Spatial frequencies

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Proceedings Article | 19 August 2005 Paper

Paper

Passive isolator design for jitter reduction in the Terrestrial Planet Finder Coronagraph

Carl Blaurock, Kuo-Chia Liu, Larry Dewell, James Alexander

Proceedings Volume 5867, 58670Y (2005) https://doi.org/10.1117/12.619328

KEYWORDS: Optical isolators, Mirrors, Planets, Coronagraphy, Passive isolation, Control systems, Sensors, Motion models, Phase modulation, Integrated modeling

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Proceedings Article | 19 August 2005 Paper

Paper

Terrestrial Planet Finder Coronagraph pointing control system design and evaluation for flight baseline 1

Kuo-Chia Liu, Carl Blaurock, James Alexander, Larry Dewell

Proceedings Volume 5867, 58670Z (2005) https://doi.org/10.1117/12.619329

KEYWORDS: Stars, Coronagraphy, Sensors, Space operations, Mirrors, Control systems, Actuators, Planets, Performance modeling, Error analysis

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Proceedings Article | 18 August 2005 Paper

Paper

Precision telescope pointing and spacecraft vibration isolation for the Terrestrial Planet Finder Coronagraph

Larry Dewell, Nelson Pedreiro, Carl Blaurock, Kuo-Chia Liu, James Alexander, Marie Levine

Proceedings Volume 5899, 589902 (2005) https://doi.org/10.1117/12.618939

KEYWORDS: Sensors, Actuators, Space operations, Interfaces, Control systems, Coronagraphy, Integrated modeling, Phase modulation, Planets, Vibration isolation

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Showing 5 of 17 publications

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