Mr. Mark T. Stahl Profile

Mark T. Stahl

at NASA MSFC PC11990977

SPIE Involvement:

Author

Proceedings Article | 31 August 2022 Poster + Paper

A concept for a deployable normal incidence EUV mirror based on shape memory alloy sheets

Melville Ulmer, Jeffrey Dugard, Daniel Quispe, Donald Buchholz, Steve Stagon, Yip-Wah Chung, Jian Cao, Konstantina Kritikos, Nicolas Guerra, Mark Stahl, Ron Shiri, Rajan Vaidyanathan

Proceedings Volume 12181, 1218131 (2022) https://doi.org/10.1117/12.2630153

KEYWORDS: Mirrors, Extreme ultraviolet, Shape memory alloys, Polishing, Surface finishing, Reflectivity, Plating, Multilayers, Stars

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Proceedings Article | 28 September 2021 Presentation + Paper

Assembly of the IXPE mirror modules

Stephen Bongiorno, Jeffery Kolodziejczak, Kiranmayee Kilaru, Ron Eng, Mark Stahl, Wayne Baumgartner, Nicholas Thomas, Jaganathan Ranganathan, Brian Ramsey, John Tucker

Proceedings Volume 11822, 118220Y (2021) https://doi.org/10.1117/12.2594316

KEYWORDS: Distortion, X-rays, Mirrors, Epoxies, Sensors, X-ray optics, Point spread functions, Calibration, X-ray imaging, Space operations

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Proceedings Article | 24 August 2021 Presentation + Paper

Predictive Thermal Control (PTC) technology to enable thermally stable telescopes: year four status

H. Philip Stahl, Thomas Brooks, Ron Eng, Tomasz Lis, Mark Stahl, Roy Young

Proceedings Volume 11820, 118200A (2021) https://doi.org/10.1117/12.2593733

KEYWORDS: Mirrors, Control systems, Telescopes, Thermal modeling, Wavefronts, Control systems design, Performance modeling, Objectives, 3D modeling, Temperature metrology

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Proceedings Article | 13 December 2020 Presentation + Paper

Deriving telescope Wavefront Error (WFE) stability error budget from coronagraph performance

H. Philip Stahl, Bijan Nemati, Mark Stahl

Proceedings Volume 11450, 114502Z (2020) https://doi.org/10.1117/12.2562818

KEYWORDS: Coronagraphy, Telescopes, Exoplanets, Wavefronts, Spectroscopy, Optical telescopes, Systems engineering, Zernike polynomials

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SPIE Journal Paper | 18 August 2020 Open Access

Method for deriving optical telescope performance specifications for Earth-detecting coronagraphs

Bijan Nemati, H. Philip Stahl, Mark Stahl, Garreth J. Ruane, Leah Sheldon

JATIS, Vol. 6, Issue 03, 039002, (August 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.3.039002

KEYWORDS: Coronagraphy, Telescopes, Signal to noise ratio, Stars, Planets, Speckle, Wavefronts, Optical telescopes, Sensors

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Proceedings Article | 9 September 2019 Presentation + Paper

SEEJ: SmallSat Exosphere Explorer of hot Jupiters

Scott Wolk, JaeSub Hong, Suzanne Romaine, Katja Poppenhaeger, Almus Kenter, Althea Moorhead, Dennis Gallagher, Christopher Moore, Martin Elvis, Ralph Kraft, Jeremy Drake, Vinay Kashyap, Elaine Winston, Bradford Wargelin, Ignazio Pillitteri, Diab Jerius, Mark Stahl, Bruce Wiegmann, Christopher Loghry

Proceedings Volume 11118, 111180E (2019) https://doi.org/10.1117/12.2529380

KEYWORDS: Jupiter, Stars, Planets, X-rays, X-ray detectors, Exoplanets, Atmospheric sciences, Magnetism, Atmospheric optics, Atmospheric sensing

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The first detected exoplanets found were "hot Jupiters"; these are large Jupiter-like planets in close orbits with their host star. The stars in these so-called "hot Jupiter systems" can have significant X-ray emission and the X-ray flux likely changes the evolution of the overall star-planetary system in at least two ways: (1) the intense high energy flux alters the structure of the upper atmosphere of the planet - in some cases leading to significant mass loss; (2) the angular momentum and magnetic field of the planet induces even more activity on the star, enhancing its X-rays, which are then subsequently absorbed by the planet. If the alignment of the systems is appropriate, the planet will transit the host star. The resulting drop in flux from the star allows us to measure the distribution of the low-density planetary atmosphere. We describe a science mission concept for a SmallSat Exosphere Explorer of hot Jupiters (SEEJ; pronounced "siege"). SEEJ will monitor the X-ray emission of nearby X-ray bright stars with transiting hot Jupiters in order to measure the lowest density portion of exoplanet atmospheres and the coronae of the exoplanet hosts. SEEJ will use revolutionary Miniature X-ray Optics (MiXO) and CMOS X-ray detectors to obtain sufficient collecting area and high sensitivity in a low mass, small volume and low-cost package. SEEJ will observe scores of transits occurring on select systems to make detailed measurements of the transit depth and shape which can be compared to out-of-transit behavior of the target system. The depth and duration of the flux change will allow us to characterize the exospheres of multiple hot Jupiters in a single year. In addition, the long baselines (covering multiple stellar rotation periods) from the transit data will allow us to characterize the temperature, flux and flare rates of the exoplanet hosts at an unprecedented level. This, in turn, will provide valuable constraints for models of atmospheric loss. In this contribution we outline the science of SEEJ and focus on the enabling technologies Miniature X-ray Optics and CMOS X-ray detectors.

Proceedings Article | 17 September 2018 Presentation + Paper

HabEx Telescope WFE stability specification derived from coronagraph starlight leakage

Bijan Nemati, H. Philip Stahl, Mark Stahl, Garreth Ruane

Proceedings Volume 10743, 107430G (2018) https://doi.org/10.1117/12.2312662

KEYWORDS: Coronagraphy, Telescopes, Signal to noise ratio, Speckle, James Webb Space Telescope, Planets, Wavefronts, Stars, Point spread functions, Mirrors

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Proceedings Article | 5 September 2017 Presentation + Paper

The effects of space telescope primary mirror segment errors on coronagraph instrument performance

Bijan Nemati, Mark Stahl, H. Philip Stahl, Stuart Shaklan

Proceedings Volume 10398, 103980G (2017) https://doi.org/10.1117/12.2273072

KEYWORDS: Coronagraphy, Planets, Telescopes, Mirrors, Space telescopes, Point spread functions, Speckle, Wavefronts

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Proceedings Article | 24 September 2015 Paper

Preliminary analysis of effect of random segment errors on coronagraph performance

Mark Stahl, Stuart Shaklan, H. Philip Stahl

Proceedings Volume 9605, 96050P (2015) https://doi.org/10.1117/12.2190160

KEYWORDS: Telescopes, Space telescopes, Wavefronts, Stars, Mirrors, Coronagraphy, Image segmentation, Planets, Error analysis, Photodetectors

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Proceedings Article | 27 August 2015 Paper

Measuring skew in average surface roughness as a function of surface preparation

Mark Stahl

Proceedings Volume 9575, 95750J (2015) https://doi.org/10.1117/12.2187535

KEYWORDS: Polishing, Surface roughness, Surface finishing, Optics manufacturing, Statistical analysis, Manufacturing, Silica, Interferometers, Laser systems engineering, Optical testing

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Proceedings Article | 7 September 2013 Paper

Incorporating skew into RMS surface roughness probability distributions

Mark Stahl, H. Philip Stahl

Proceedings Volume 8838, 883814 (2013) https://doi.org/10.1117/12.2024883

KEYWORDS: Statistical analysis, Surface roughness, James Webb Space Telescope, Polishing, Surface finishing, Telescopes, Manufacturing, Space telescopes, Mirrors, Optical design

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Proceedings Article | 31 May 2013 Paper

Demonstration of detection and ranging using solvable chaos

Ned Corron, Mark Stahl, Jonathan Blakely

Proceedings Volume 8714, 871406 (2013) https://doi.org/10.1117/12.2016086

KEYWORDS: Oscillators, Ranging, Receivers, Acoustics, Chaos, Transmitters, Signal detection, Filtering (signal processing), Digital signal processing, Signal processing

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Proceedings Article | 27 April 2010 Paper

Demonstration of shifter-less beam steering in an ultra-wide bandwidth array antenna using synchronized chaos

Jonathan Blakely, Billy Reed, Ned Corron, Mark Stahl, Krishna Myneni

Proceedings Volume 7669, 76690Q (2010) https://doi.org/10.1117/12.850153

KEYWORDS: Oscillators, Antennas, Beam steering, Chaos, Radar, Diodes, Lead, Resistance, Phase shifts, Control systems

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Showing 5 of 13 publications

Conference Committee Involvement (2)

IT Committee

1 January 2019 |

IT Committee

1 January 2018 |

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