Mr. Steve L. Hegwer Profile

Steve L. Hegwer

Retired at Spectra Consulting Services

SPIE Involvement:

Author

Publications (29)

Proceedings Article | 18 August 2016 Paper

Paper

Construction status of the Daniel K. Inouye solar telescope

Joseph McMullin, Thomas Rimmele, Mark Warner, Valentin Pillet, Roberto Casini, Steve Berukoff, Simon Craig, David Elmore, Andrew Ferayorni, Bret Goodrich, Robert Hubbard, David Harrington, Steve Hegwer, Paul Jeffers, Erik Johansson, Jeff Kuhn, Haosheng Lin, Heather Marshall, Mihalis Mathioudakis, William McBride, William McVeigh, LeEllen Phelps, Wolfgang Schmidt, Steve Shimko, Stacey Sueoka, Alexandra Tritschler, Timothy Williams, Friedrich Wöger

Proceedings Volume 9906, 99061B (2016) https://doi.org/10.1117/12.2235227

KEYWORDS: Imaging systems, Observatories, Solar processes, Telescopes, Mirrors, Optical fabrication, Buildings, Space telescopes, Control systems, Deformable mirrors

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We provide an update on the construction status of the Daniel K. Inouye Solar Telescope. This 4-m diameter facility is designed to enable detection and spatial/temporal resolution of the predicted, fundamental astrophysical processes driving solar magnetism at their intrinsic scales throughout the solar atmosphere. These data will drive key research on solar magnetism and its influence on solar winds, flares, coronal mass ejections and solar irradiance variability. The facility is developed to support a broad wavelength range (0.35 to 28 microns) and will employ state-of-the-art adaptive optics systems to provide diffraction limited imaging, resolving features approximately 20 km on the Sun. At the start of operations, there will be five instruments initially deployed: Visible Broadband Imager (VBI; National Solar Observatory), Visible SpectroPolarimeter (ViSP; NCAR High Altitude Observatory), Visible Tunable Filter (VTF (a Fabry-Perot tunable spectropolarimeter); Kiepenheuer Institute for Solarphysics), Diffraction Limited NIR Spectropolarimeter (DL-NIRSP; University of Hawaii, Institute for Astronomy) and the Cryogenic NIR Spectropolarimeter (Cryo-NIRSP; University of Hawaii, Institute for Astronomy).

As of mid-2016, the project construction is in its 4th year of site construction and 7th year overall. Major milestones in the off-site development include the conclusion of the polishing of the M1 mirror by University of Arizona, College of Optical Sciences, the delivery of the Top End Optical Assembly (L3), the acceptance of the Deformable Mirror System (Xinetics); all optical systems have been contracted and are either accepted or in fabrication. The Enclosure and Telescope Mount Assembly passed through their factory acceptance in 2014 and 2015, respectively. The enclosure site construction is currently concluding while the Telescope Mount Assembly site erection is underway. The facility buildings (Utility and Support and Operations) have been completed with ongoing work on the thermal systems to support the challenging imaging requirements needed for the solar research.

Finally, we present the construction phase performance (schedule, budget) with projections for the start of early operations.

Proceedings Article | 9 August 2016 Paper

Paper

DKIST visible broadband imager alignment in laboratory: first results

Predrag Sekulic, Scott Gregory, Steve Hegwer, Andrew Ferayorni, Friedrich Woeger

Proceedings Volume 9908, 99085A (2016) https://doi.org/10.1117/12.2233660

KEYWORDS: Optical alignment, Interferometry, Tolerancing, Lenses, Data modeling, Mirrors, Objectives, Interferometers, Monochromatic aberrations, Monte Carlo methods

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Proceedings Article | 7 August 2014 Paper

Paper

Solar adaptive optics with the DKIST: status report

Luke Johnson, Keith Cummings, Mark Drobilek, Scott Gregory, Steve Hegwer, Erik Johansson, Jose Marino, Kit Richards, Thomas Rimmele, Predrag Sekulic, Friedrich Wöger

Proceedings Volume 9148, 91481S (2014) https://doi.org/10.1117/12.2056990

KEYWORDS: Wavefronts, Wavefront sensors, Mirrors, Adaptive optics, Actuators, Telescopes, Control systems, Field programmable gate arrays, Active optics, Real-time computing

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Proceedings Article | 22 July 2014 Paper

Paper

Construction status of the Daniel K. Inouye Solar Telescope

Joseph McMullin, Thomas Rimmele, Valentin Martínez Pillet, Thomas Berger, Roberto Casini, Simon Craig, David Elmore, Bret Goodrich, Steve Hegwer, Robert Hubbard, Erik Johansson, Jeffrey Kuhn, Haosheng Lin, William McVeigh, Wolfgang Schmidt, Steve Shimko, Alexandra Tritschler, Mark Warner, Friedrich Wöger

Proceedings Volume 9145, 914525 (2014) https://doi.org/10.1117/12.2055483

KEYWORDS: Observatories, Solar telescopes, Optical fabrication, Telescopes, Astronomy, Adaptive optics, Visible radiation, Control systems, Sun, Solar processes

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Proceedings Article | 8 July 2014 Paper

Paper

The Daniel K. Inouye Solar Telescope first light instruments and critical science plan

David Elmore, Thomas Rimmele, Roberto Casini, Steve Hegwer, Jeff Kuhn, Haosheng Lin, Joseph McMullin, Kevin Reardon, Wolfgang Schmidt, Alexandra Tritschler, Friedrich Wöger

Proceedings Volume 9147, 914707 (2014) https://doi.org/10.1117/12.2057038

KEYWORDS: Visible radiation, Calibration, Solar telescopes, Solar processes, Spatial resolution, Coronagraphy, Near infrared, Data centers, Telescopes, Adaptive optics

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Proceedings Article | 24 September 2012 Paper

Paper

ATST visible broadband imager

William McBride, Friedrich Wöger, Steve Hegwer, Andrew Ferayorni, B. Scott Gregory

Proceedings Volume 8446, 84461B (2012) https://doi.org/10.1117/12.925472

KEYWORDS: Optical filters, Cameras, Imaging systems, Interference filters, Image restoration, Solar telescopes, Image filtering, Diffraction, Speckle, Telescopes

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Proceedings Article | 17 September 2012 Paper

Paper

The Advanced Technology Solar Telescope: design and early construction

Joseph McMullin, Thomas Rimmele, Stephen Keil, Mark Warner, Samuel Barden, Scott Bulau, Simon Craig, Bret Goodrich, Eric Hansen, Steve Hegwer, Robert Hubbard, William McBride, Steve Shimko, Friedrich Wöger, Jennifer Ditsler

Proceedings Volume 8444, 844407 (2012) https://doi.org/10.1117/12.926949

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Magnetism, Control systems, Buildings, Observatories, Solar processes, Sun, Solar telescopes

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The National Solar Observatory’s (NSO) Advanced Technology Solar Telescope (ATST) is the first large U.S. solar telescope accessible to the worldwide solar physics community to be constructed in more than 30 years. The 4-meter diameter facility will operate over a broad wavelength range (0.35 to 28 μm ), employing adaptive optics systems to achieve diffraction limited imaging and resolve features approximately 20 km on the Sun; the key observational parameters (collecting area, spatial resolution, spectral coverage, polarization accuracy, low scattered light) enable resolution of the theoretically-predicted, fine-scale magnetic features and their dynamics which modulate the radiative output of the sun and drive the release of magnetic energy from the Sun’s atmosphere in the form of flares and coronal mass ejections. In 2010, the ATST received a significant fraction of its funding for construction. In the subsequent two years, the project has hired staff and opened an office on Maui. A number of large industrial contracts have been placed throughout the world to complete the detailed designs and begin constructing the major telescope subsystems. These contracts have included the site development, AandE designs, mirrors, polishing, optic support assemblies, telescope mount and coudé rotator structures, enclosure, thermal and mechanical systems, and high-level software and controls. In addition, design development work on the instrument suite has undergone significant progress; this has included the completion of preliminary design reviews (PDR) for all five facility instruments. Permitting required for physically starting construction on the mountaintop of Haleakalā, Maui has also progressed. This paper will review the ATST goals and specifications, describe each of the major subsystems under construction, and review the contracts and lessons learned during the contracting and early construction phases. Schedules for site construction, key factory testing of major subsystems, and integration, test and commissioning activities will also be discussed.

Proceedings Article | 28 July 2010 Paper

Paper

The Advanced Technology Solar Telescope: beginning construction of the world's largest solar telescope

T. R. Rimmele, J. Wagner, S. Keil, D. Elmore, R. Hubbard, E. Hansen, M. Warner, P. Jeffers, L. Phelps, H. Marshall, B. Goodrich, K. Richards, S. Hegwer, R. Kneale, J. Ditsler

Proceedings Volume 7733, 77330G (2010) https://doi.org/10.1117/12.857714

KEYWORDS: Control systems, Telescopes, Adaptive optics, Wavefronts, Solar processes, Solar telescopes, Mirrors, Cameras, Interfaces, Observatories

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Proceedings Article | 28 July 2010 Paper

Paper

The adaptive optics and wavefront correction systems for the Advanced Technology Solar Telescope

K. Richards, T. Rimmele, S. Hegwer, R. Upton, F. Woeger, J. Marino, S. Gregory, B. Goodrich

Proceedings Volume 7736, 773608 (2010) https://doi.org/10.1117/12.857515

KEYWORDS: Adaptive optics, Wavefront sensors, Wavefronts, Mirrors, Control systems, Telescopes, Cameras, Digital signal processing, Actuators, Solar telescopes

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Proceedings Article | 28 July 2010 Paper

Paper

Solar multiconjugate adaptive optics at the Dunn Solar Telescope

T. Rimmele, F. Woeger, J. Marino, K. Richards, S. Hegwer, T. Berkefeld, D. Soltau, D. Schmidt, T. Waldmann

Proceedings Volume 7736, 773631 (2010) https://doi.org/10.1117/12.857485

KEYWORDS: Adaptive optics, Solar telescopes, Diffraction, Wavefront sensors, Telescopes, Turbulence, Digital signal processing, Stars, Motion measurement, Sun

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Proceedings Article | 10 July 2008 Paper

Paper

Advanced Technology Solar Telescope: a progress report

J. Wagner, T. Rimmele, S. Keil, R. Hubbard, E. Hansen, L. Phelps, M. Warner, B. Goodrich, K. Richards, S. Hegwer, R. Kneale, J. Ditsler

Proceedings Volume 7012, 70120I (2008) https://doi.org/10.1117/12.789436

KEYWORDS: Telescopes, Control systems, Wavefronts, Adaptive optics, Observatories, Mirrors, Buildings, Control systems design, Solar telescopes, Optical instrument design

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Proceedings Article | 27 June 2006 Paper

Paper

The wavefront correction system for the Advanced Technology Solar Telescope

T. Rimmele, K. Richards, J. Roche, S. Hegwer, R. Hubbard, E. Hansen, B. Goodrich, R. Upton

Proceedings Volume 6272, 627212 (2006) https://doi.org/10.1117/12.672330

KEYWORDS: Adaptive optics, Wavefronts, Telescopes, Wavefront sensors, Control systems, Mirrors, Digital signal processing, Cameras, Solar telescopes, Performance modeling

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Proceedings Article | 27 June 2006 Paper

Paper

Progress with solar multi-conjugate adaptive optics at NSO

Thomas Rimmele, Kit Richards, Jacqueline Roche, Steve Hegwer, Alexandra Tritschler

Proceedings Volume 6272, 627206 (2006) https://doi.org/10.1117/12.671603

KEYWORDS: Adaptive optics, Wavefront sensors, Stars, Solar telescopes, Actuators, Telescopes, Cameras, Digital signal processing, Deformable mirrors, Wavefronts

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Proceedings Article | 23 June 2006 Paper

Paper

Advanced Technology Solar Telescope: a progress report

J. Wagner, T. Rimmele, S. Keil, J. Barr, N. Dalrymple, J. Ditsler, B. Goodrich, E. Hansen, S. Hegwer, F. Hill, R. Hubbard, L. Phelps, R. Price, K. Richards, M. Warner

Proceedings Volume 6267, 626709 (2006) https://doi.org/10.1117/12.672495

KEYWORDS: Telescopes, Control systems, Mirrors, Wavefronts, Adaptive optics, Observatories, Control systems design, Buildings, Interfaces, Solar telescopes

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Proceedings Article | 23 June 2006 Paper

Paper

Site testing for the Advanced Technology Solar Telescope

F. Hill, J. Beckers, P. Brandt, J. Briggs, T. Brown, W. Brown, M. Collados, C. Denker, S. Fletcher, S. Hegwer, T. Horst, M. Komsa, J. Kuhn, A. Lecinski, H. Lin, S. Oncley, M. Penn, R. Radick, T. Rimmele, H. Socas-Navarro, K. Streander

Proceedings Volume 6267, 62671T (2006) https://doi.org/10.1117/12.673677

KEYWORDS: Telescopes, Lanthanum, Solar telescopes, Infrared telescopes, Observatories, Astronomy, Data analysis, Absorption, Turbulence, Optical instrument design

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Proceedings Article | 25 October 2004 Paper

Paper

Optical set-up and design for solar multiconjugate adaptive optics at Dunn Solar Telescope/NSO

Gil Moretto, Maud Langlois, Kit Richards, Steve Hegwer, Doug Gilliam, Thomas Rimmele

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.548894

KEYWORDS: Adaptive optics, Optical design, Deformable mirrors, Wavefront sensors, Telescopes, Collimation, CMOS cameras, Mirrors, Cameras, Actuators

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Proceedings Article | 25 October 2004 Paper

Paper

Solar multiconjugate adaptive optics at the Dunn Solar Telescope: preliminary results

Maud Langlois, Gil Moretto, Kit Richards, Steve Hegwer, Thomas Rimmele

Proceedings Volume 5490, (2004) https://doi.org/10.1117/12.548929

KEYWORDS: Adaptive optics, Wavefronts, Tomography, Wavefront sensors, Turbulence, Solar telescopes, Sun, Telescopes, Observatories, Deformable mirrors

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Proceedings Article | 28 September 2004 Paper

Paper

Solar site testing for the Advanced Technology Solar Telescope

Frank Hill, Jacques Beckers, Peter Brandt, John Briggs, Timothy Brown, W. Brown, Manuel Collados, Carsten Denker, Steven Fletcher, Steven Hegwer, T. Horst, Mark Komsa, Jeff Kuhn, Alice Lecinski, Haosheng Lin, Steve Oncley, Matthew Penn, Thomas Rimmele, Hector Socas-Navarro, Kim Streander

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.551812

KEYWORDS: Lanthanum, Solar telescopes, Telescopes, Observatories, Astronomy, Infrared telescopes, Absorption, Statistical analysis, Coronagraphy, Wind measurement

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Proceedings Article | 28 September 2004 Paper

Paper

Advanced Technology Solar Telescope: conceptual design and status

Stephen Keil, Jacobus Oschmann, Thomas Rimmele, Rob Hubbard, Mark Warner, Ron Price, Nathan Dalrymple, Bret Goodrich, Steven Hegwer, Frank Hill, Jeremy Wagner

Proceedings Volume 5489, (2004) https://doi.org/10.1117/12.552405

KEYWORDS: Telescopes, Adaptive optics, Optical instrument design, Polarization, Solar telescopes, Polarimetry, Mirrors, Visible radiation, Space telescopes, Control systems design

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Proceedings Article | 4 February 2004 Paper

Paper

The Diffraction Limited Spectro-Polarimeter: a new instrument for high-resolution solar polarimetry

K. Sankarasubramanian, Craig Gullixson, Stephen Hegwer, Thomas Rimmele, Scott Gregory, Tony Spence, Stephen Fletcher, Kit Richards, Emilie Rousset, Bruce Lites, David Elmore, Kim Streander, Michael Sigwarth

Proceedings Volume 5171, (2004) https://doi.org/10.1117/12.508790

KEYWORDS: Modulators, Polarization, Optical components, Wave plates, Adaptive optics, Cameras, Calibration, Polymers, Computing systems, Spectrographs

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Proceedings Article | 4 February 2004 Paper

Paper

First results from the NSO/NJIT solar adaptive optics system

Thomas Rimmele, Kit Richards, Stephen Hegwer, Stephen Fletcher, Scott Gregory, Gilberto Moretto, Leonid Didkovsky, Carsten Denker, Alexander Dolgushin, Philip Goode, Maud Langlois, Jose Marino, William Marquette

Proceedings Volume 5171, (2004) https://doi.org/10.1117/12.508513

KEYWORDS: Adaptive optics, Digital signal processing, Wavefront sensors, Cameras, Imaging systems, Observatories, Diffraction, Mirrors, Sensors, Magnetism

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Proceedings Article | 14 February 2003 Paper

Paper

Diffraction-limited spectropolarimeter: Phase I

Kasiviswanathan Sankarasubramanian, David Elmore, Bruce Lites, Michael Sigwarth, Thomas Rimmele, Steven Hegwer, Scott Gregory, Kim Streander, Lawrence Wilkins, K. Richards, C. Berst

Proceedings Volume 4843, (2003) https://doi.org/10.1117/12.459281

KEYWORDS: Spectrographs, Cameras, Magnetism, Spatial resolution, Adaptive optics, Diffraction, Observatories, Charge-coupled devices, Polarization, Polarimetry

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Proceedings Article | 11 February 2003 Paper

Paper

Design and development of the Advanced Technology Solar Telescope

Stephen Keil, Thomas Rimmele, Christoph Keller, Frank Hill, Richard Radick, Jacobus Oschmann, Mark Warner, Nathan Dalrymple, John Briggs, Steven Hegwer, Dauxing Ren

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460273

KEYWORDS: Magnetism, Telescopes, Adaptive optics, Light scattering, Mirrors, Solar telescopes, Solar processes, Optical instrument design, Visible radiation, Observatories

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Proceedings Article | 11 February 2003 Paper

Paper

Environmental factors affecting solar seeing

Frank Hill, John Briggs, Steven Hegwer, Richard Radick

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460298

KEYWORDS: Turbulence, Observatories, Water, Electroluminescence, Telescopes, Environmental sensing, Convection, Meteorology, Solar telescopes, Lanthanum

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Proceedings Article | 11 February 2003 Paper

Paper

High-order adaptive optical system for big bear solar observatory

Leonid Didkovsky, Alexander Dolgushyn, William Marquette, Jeff Nenow, John Varsik, Philip Goode, Steven Hegwer, Deqing Ren, Steve Fletcher, Kit Richards, Thomas Rimmele, Carsten Denker, Haimin Wang

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.471341

KEYWORDS: Adaptive optics, Fabry–Perot interferometers, Mirrors, Visible radiation, Solar telescopes, Infrared imaging, Optical benches, Observatories, Cameras, Sensors

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Proceedings Article | 11 February 2003 Paper

Paper

Image slicer integral field unit for solar telescope

Deqing Ren, Steven Hegwer

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460269

KEYWORDS: Mirrors, Observatories, Polarimetry, Adaptive optics, Spectrographs, Visible radiation, Near infrared, Microlens, Microlens array, Iterated function systems

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Proceedings Article | 11 February 2003 Paper

Paper

Optical design of a high-order adaptive optics for the NSO Dunn Solar Telescope and the Big Bear Solar Observatory

Deqing Ren, Steven Hegwer, Thomas Rimmele, Leonid Didkovsky, Philip Goode

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460270

KEYWORDS: Adaptive optics, Mirrors, Optical design, Sensors, Image sensors, Wavefront sensors, Solar telescopes, Observatories, Sun, Wavefront aberrations

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Proceedings Article | 7 February 2003 Paper

Paper

Solar adaptive optics: a progress report

Thomas Rimmele, Kit Richards, Steven Hegwer, Deqing Ren, S. Fletcher, Scott Gregory, Leonid Didkovsky, Carsten Denker, William Marquette, J. Marino, Philip Goode

Proceedings Volume 4839, (2003) https://doi.org/10.1117/12.457018

KEYWORDS: Adaptive optics, Digital signal processing, Wavefront sensors, Cameras, Diffraction, Mirrors, Sensors, Observatories, Sun, Magnetism

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Proceedings Article | 4 February 2003 Paper

Paper

Technical challenges of the Advanced Technology Solar Telescope

Thomas Rimmele, Stephen Keil, Christoph Keller, Frank Hill, John Briggs, Nathan Dalrymple, Bret Goodrich, Steven Hegwer, Rob Hubbard, Jacobus Oschmann, Richard Radick, Deqing Ren, Jeremy Wagner, Stephen Wampler, Mark Warner

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.456707

KEYWORDS: Telescopes, Adaptive optics, Polarization, Mirrors, Solar telescopes, Optical instrument design, Polarimetry, Solar processes, Magnetism, Monochromatic aberrations

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Showing 5 of 29 publications

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