Dr. Mark W. Dragovan Profile

Dr. Mark W. Dragovan

at Jet Propulsion Lab

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 6 August 2010 Paper

Paper

Optical design of the EPIC-IM crossed Dragone telescope

Huan Tran, Brad Johnson, Mark Dragovan, James Bock, Abdullah Aljabri, Alex Amblard, Daniel Bauman, Marc Betoule, Talso Chui, Loris Colombo, Asantha Cooray, Dustin Crumb, Peter Day, Clive Dickenson, Darren Dowell, Sunil Golwala, Krzysztof Gorski, Shaul Hanany, Warren Holmes, Kent Irwin, Brian Keating, Chao-Lin Kuo, Adrian Lee, Andrew Lange, Charles Lawrence, Steve Meyer, Nate Miller, Hien Nguyen, Elena Pierpaoli, Nicolas Ponthieu, Jean-Loup Puget, Jeff Raab, Paul Richards, Celeste Satter, Mike Seiffert, Meir Shimon, Brett Williams, Jonas Zmuidzinas

Proceedings Volume 7731, 77311R (2010) https://doi.org/10.1117/12.857423

KEYWORDS: Polarization, Telescopes, Mirrors, Device simulation, Optical simulations, Optical design, Space telescopes, Sensors, Space operations, Geometrical optics

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Proceedings Article | 23 July 2008 Paper

Paper

Panel options for large precision radio telescopes

David Woody, Dan MacDonald, Matt Bradford, Richard Chamberlin, Mark Dragovan, Paul Goldsmith, James Lamb, Simon Radford, Jonas Zmuidzinas

Proceedings Volume 7018, 70180T (2008) https://doi.org/10.1117/12.788077

KEYWORDS: Reflectors, Telescopes, Sensors, Aluminum, Control systems, Error analysis, Radio telescopes, Manufacturing, Temperature metrology, Actuators

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Proceedings Article | 17 July 2008 Paper

Paper

Cornell Caltech Atacama Telescope primary mirror surface sensing and controllability

Daniel MacDonald, David Woody, C. Matt Bradford, Richard Chamberlin, Mark Dragovan, Paul Goldsmith, Simon Radford, Thomas Sebring, Jonas Zmuidzinas

Proceedings Volume 7012, 701211 (2008) https://doi.org/10.1117/12.790528

KEYWORDS: Mirrors, Sensors, Control systems, Actuators, Telescopes, Thermal modeling, Wavefront sensors, Wavefronts, Carbon, Control systems design

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Proceedings Article | 12 July 2008 Paper

Paper

CALISTO: the Cryogenic Aperture Large Infrared Space Telescope Observatory

Paul Goldsmith, Matt Bradford, Mark Dragovan, Chris Paine, Celeste Satter, Bill Langer, Harold Yorke, Kevin Huffenberger, Dominic Benford, Dan Lester

Proceedings Volume 7010, 701020 (2008) https://doi.org/10.1117/12.788412

KEYWORDS: Space telescopes, Stars, Telescopes, Astronomy, Galactic astronomy, Infrared telescopes, Infrared radiation, Space operations, Observatories, Spectroscopy

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CALISTO, the Cryogenic Aperture Large Infrared Space Telescope Observatory, will enable extraordinarily high sensitivity far-infrared continuum and moderate (R ~ 1000) resolution spectroscopic observations at wavelengths from ~30µm to ~300 μm - the wavelengths between those accessible by JWST and future ground based facilities. CALISTO's observations will provide vital information about a wide range of important astronomical questions including (1) the first stars and initial heavy element production in the universe; (2) structures in the universe traced by H2 emission; (3) the evolution of galaxies and the star formation within them (4) the formation of planetary systems through observations of protostellar and debris disks; (5) the outermost portions of our solar system through observations of Trans-Neptunian Objects (TNOs) and the Oort cloud. With optics cooled to below 5 K, the photon fluctuations from the astronomical background (Zodiacal, Galactic, and extragalactic) exceed those from the telescope. Detectors with a noise equivalent power below that set by the background will make possible astronomical-background-limited sensitivity through the submillimeter/far-infrared region. CALISTO builds on studies for the SAFIR (Single Aperture Far Infrared) telescope mission, employing a 4m x 6m off-axis Gregorian telescope which has a simple deployment using an Atlas V launch vehicle. The unblocked telescope with a cold stop has minimal sidelobes and scattering. The clean beam will allow astronomical background limited observations over a large fraction of the sky, which is what is required to achieve CALISTO's exciting science goals. The maximum angular resolution varies from 1.2" at 30 µm to 12" at 300 μm. The 5σ 1 hr detectable fluxes are ▵S(dν/ν = 1.0) = 2.2x10^-20 Wm^-2, and ▵S(dν/ν = 0.001) = 6.2x10^-22 Wm^-2. The 8 beams per source confusion limit at 70 μm is estimated to be 5 μJy. We discuss CALISTO optics, performance, instrument complement, and mission design, and give an overview of key science goals and required technology development to enable this promising far IR/submm mission.

Proceedings Article | 18 October 2007 Paper

Paper

Instrumentation for the next generation cryogenic spaceborne far-IR observatories

C. Matt Bradford, Paul Goldsmith, Mark Dragovan, Matt Kenyon, Warren Holmes, Harold Yorke

Proceedings Volume 6687, 66870O (2007) https://doi.org/10.1117/12.732657

KEYWORDS: Galactic astronomy, Sensors, Bolometers, Spectroscopy, Space telescopes, Telescopes, Cameras, Cryogenics, Stars, Spectrographs

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Proceedings Article | 20 September 2007 Paper

Paper

CALISTO: a cryogenic far-infrared/submillimeter observatory

P. Goldsmith, C. M. Bradford, M. Dragovan, B. Khayatian, K. Huffenberger, I. O'Dwyer, K. Górski, H. Yorke, J. Zmuidzinas, C. Paine, C. Satter, R. Lee

Proceedings Volume 6687, 66870P (2007) https://doi.org/10.1117/12.731049

KEYWORDS: Telescopes, Reflectors, Space telescopes, Astronomy, Sensors, Diffraction, Infrared radiation, Space operations, Observatories, Infrared telescopes

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Proceedings Article | 7 July 2006 Paper

Paper

A parametric design tool for large space telescope sunshields

Christopher Paine, Charles Bradford, Mark Dragovan, Harold Yorke

Proceedings Volume 6265, 62652R (2006) https://doi.org/10.1117/12.672151

KEYWORDS: Space telescopes, Thermal modeling, Telescopes, Black bodies, Performance modeling, Radiative transfer, Optical instrument design, Space operations, Optical properties, Solar radiation models

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Proceedings Article | 6 July 2006 Paper

Paper

Z-Spec: a broadband direct-detection millimeter-wave spectrometer -- instrument status and first results

L. Earle, P. Ade, J. Aguirre, R. Aikin, J. Battle, J. Bock, C. Bradford, M. Dragovan, L. Duband, J. Glenn, G. Griffin, V. Hristov, P. Maloney, H. Matsuhara, B. Naylor, H. Nguyen, M. Yun, J. Zmuidzinas

Proceedings Volume 6275, 627510 (2006) https://doi.org/10.1117/12.672309

KEYWORDS: Spectroscopy, Waveguides, Sensors, Galactic astronomy, Astronomy, Spectral resolution, Telescopes, Carbon monoxide, Bolometers, Space telescopes

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Proceedings Article | 16 June 2006 Paper

Paper

Analysis of the optical design for the SAFIR telelscope

Paul Goldsmith, Behrouz Khayatian, Matt Bradford, Mark Dragovan, Daniel Hoppe, William Imbriale, Roger Lee, Chris Paine, Philip Turner, Harold Yorke, Jonas Zmuidzinas

Proceedings Volume 6265, 62654A (2006) https://doi.org/10.1117/12.670051

KEYWORDS: Reflectors, Telescopes, Space telescopes, Diffraction, Antennas, Scattering, Astronomy, Solar system, Earth's atmosphere, Reflection

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SAFIR, the Single Aperture Far Infra Red Observatory, is a very powerful space mission that will achieve background-limited sensitivity in the far infrared-submillimeter spectral region. Many processes of enormous interest to astronomers can best be studied in this wavelength range, but require the demanding combination of high sensitivity, good angular resolution, and spectroscopic capability. SAFIR is a 10m class telescope offering good angular resolution, cooled to below 5 K in order to achieve background-limited sensitivity, and equipped with a complement of large-format cameras and broadband spectrometers. Successful operation of such a facility is critically dependent on achieving the level of sensitivity expected, but this is rendered difficult by potential pickup from unwanted sources of radiation. This problem is exacerbated by the fact that the emission from the optical system itself is minimal due to its low temperature, thus emphasizing the importance of minimizing pickup from unwanted astronomical sources of radiation, including the emission from dust in our solar system (analogous to the zodiacal light, hence "zodi"), and the emission from warm dust in the Milky Way (Galactic "cirrus"). The extreme sensitivity of SAFIR to these unwanted sources of radiation makes it essential to understand the relative sensitivity of the telescope/detector system to radiation coming from angles far outside the main beam, and to develop designs which minimize this pickup. In this paper we analyze in some detail the relative telescope sensitivity (referred to as the antenna pattern by microwave engineers) for different designs of SAFIR. These calculations include edge diffraction from the secondary and primary reflector, and also the effect of blockage by the secondary and blockage and scattering by support legs in a symmetric system. By convolving the antenna pattern with the brightness of the sky due to the zodi and cirrus, we can calculate the power received when the antenna is pointed in any specified direction. We can also compare the undesired pickup for different designs, in particular symmetric vs. asymmetric (off-axis or unblocked) antenna configurations. These considerations are vital for achieving the most efficient SAFIR design possible, in terms of achieving maximum sensitivity while being able to observe over a large fraction of the sky.

Proceedings Article | 12 October 2004 Paper

Paper

Thermal design trades for SAFIR architecture concepts

Harold Yorke, Christopher Paine, Charles Bradford, Mark Dragovan, Al Nash, Jennifer Dooley, Charles Lawrence

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551995

KEYWORDS: Telescopes, Space telescopes, Reflectors, James Webb Space Telescope, Mirrors, Stars, Reflector telescopes, Far infrared, Galactic astronomy, Space operations

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Proceedings Article | 12 October 2004 Paper

Paper

The science case and mission concept for the Single Aperture Far-Infrared (SAFIR) Observatory

Daniel Lester, Dominic Benford, Andrew Blain, Charles Bradford, Mark Dragovan, William Langer, Charles Lawrence, David Leisawitz, John Mather, Samuel Moseley, Lee Mundy, George Rieke, Gordon Stacey, Harold Yorke, Erick Young

Proceedings Volume 5487, (2004) https://doi.org/10.1117/12.551335

KEYWORDS: Observatories, Stars, Space telescopes, James Webb Space Telescope, Telescopes, Galactic astronomy, Mirrors, Infrared telescopes, Spatial resolution, Infrared radiation

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Proceedings Article | 8 October 2004 Paper

Paper

Z-Spec, a broadband millimeter-wave grating spectrometer--design, construction, and first cryogenic measurements

C. Matt Bradford, Peter Ade, James Aguirre, James Bock, Mark Dragovan, Lionel Duband, Lieko Earle, Jason Glenn, Hideo Matsuhara, Bret Naylor, Hien Nguyen, Minhee Yun, Jonas Zmuidzinas

Proceedings Volume 5498, (2004) https://doi.org/10.1117/12.552182

KEYWORDS: Spectroscopy, Waveguides, Sensors, Cryogenics, Bolometers, Spectral resolution, Galactic astronomy, Telescopes, Diffraction gratings, Space telescopes

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Proceedings Article | 24 September 2004 Paper

Paper

The DART cylindrical infrared 1-meter membrane reflector

Rhonda Morgan, Greg Agnes, Dan Barber, Jennifer Dooley, Mark Dragovan, Al Hatheway, Marty Marcin

Proceedings Volume 5494, (2004) https://doi.org/10.1117/12.562451

KEYWORDS: Reflectors, Profilometers, Infrared radiation, Space telescopes, Copper, Interferometers, Telescopes, Metrology, Mirrors, Reflector telescopes

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Proceedings Article | 30 January 2004 Paper

Paper

Design and test of a 2m x 4m DART system in the RF

Jason Tolomeo, Jay Loane, Domenick Tenerelli, Eugene Cross, William Sable, Tom Decker, Kin Chan, Tom Nelson, Bill Joseph, Connor Windes, Doug Kokawa, Alex Kamis, Mark Dragovan, Jennifer Dooley

Proceedings Volume 5166, (2004) https://doi.org/10.1117/12.506656

KEYWORDS: Reflectors, Prototyping, Space telescopes, Analytical research, Antennas, Optical instrument design, Reflector design, Imaging systems, Space operations, Wavefronts

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Proceedings Article | 5 March 2003 Paper

Paper

WaFIRS: a waveguide far-IR spectrometer enabling spectroscopy of high-z galaxies in the far-IR and submillimeter

Charles Bradford, Bret Naylor, Jonas Zmuidzinas, James Bock, J. Gromke, Hien Nguyen, Mark Dragovan, Minhee Yun, Lieko Earle, Jason Glenn, Hideo Matsuhara, Peter Ade, Lionel Duband

Proceedings Volume 4850, (2003) https://doi.org/10.1117/12.461572

KEYWORDS: Spectroscopy, Waveguides, Sensors, Galactic astronomy, Diffraction gratings, Infrared spectroscopy, Space telescopes, Spectral resolution, Wave propagation, Prototyping

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Proceedings Article | 17 February 2003 Paper

Paper

Z-Spec: a broadband direct-detection millimeter-wave spectrometer

Bret Naylor, Peter Ade, James Bock, Charles Bradford, Mark Dragovan, Lionel Duband, Lieko Earle, Jason Glenn, Hideo Matsuhara, Hien Nguyen, Minhee Yun, Jonas Zmuidzinas

Proceedings Volume 4855, (2003) https://doi.org/10.1117/12.459419

KEYWORDS: Spectroscopy, Waveguides, Bolometers, Sensors, Diffraction gratings, Galactic astronomy, Telescopes, Silicon, Cryogenics, Spectral resolution

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Proceedings Article | 18 December 2002 Paper

Paper

DART system for far-IR/submillimeter space telescopes

Mark Dragovan

Proceedings Volume 4849, (2002) https://doi.org/10.1117/12.460068

KEYWORDS: Lutetium, Lithium, Space telescopes, Reflector telescopes

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Proceedings Article | 18 December 2002 Paper

Paper

Design and test of a prototype DART system

Jason Tolomeo, Eugene Cross, William Sable, Tom Decker, Dave Putnam, Thomas Jamieson, Mark Dragovan, Artur Chmielewski, Jennifer Dooley

Proceedings Volume 4849, (2002) https://doi.org/10.1117/12.460454

KEYWORDS: Mirrors, Prototyping, Reflectors, Telescopes, Collimators, Space telescopes, Diffraction, Sensors, Aluminum, Infrared cameras

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Proceedings Article | 5 July 2000 Paper

Paper

Space-based interferometric telescopes for the far infrared

Michael Shao, William Danchi, Michael DiPirro, Mark Dragovan, Lee Feinberg, Mike Hagopian, William Langer, Charles Lawrence, Peter Lawson, David Leisawitz, John Mather, Samuel Moseley, Mark Swain, Harold Yorke, Xiaolei Zhang

Proceedings Volume 4006, (2000) https://doi.org/10.1117/12.390278

KEYWORDS: Sensors, Mirrors, Space telescopes, Interferometers, Telescopes, Stars, Cryogenics, Interferometry, Infrared telescopes, Far infrared

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Proceedings Article | 31 July 1998 Paper

Paper

DASI: Degree Angular Scale Interferometer for imaging anisotropy in the cosmic microwave background

Nils Halverson, John Carlstrom, Mark Dragovan, William Holzapfel, John Kovac

Proceedings Volume 3357, (1998) https://doi.org/10.1117/12.317374

KEYWORDS: Interferometers, Receivers, Anisotropy, Microwave radiation, Optical correlators, Amplifiers, Telescopes, Field effect transistors, Polarizers, Acoustics

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Showing 5 of 20 publications

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