research overview
- Prof. Cash's work is in experimental space astronomy. He has two primary interests - spectroscopy of celestial x-ray sources and the search for Earth-like planets.
- Contact Info
CASH, WEBSTER
Positions
- Professor, Astrophysical and Planetary Sciences (APS)
- Professor, Aerospace Engineering Sciences
Research Areas
Research
keywords
- diffractive optics, x-ray optics, x-ray spectroscopy, exoplanets
Publications
selected publications
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chapter
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High resolution x-ray imaging.
AIP Conference Proceedings.
44-57.
1999
-
High resolution x-ray imaging.
AIP Conference Proceedings.
44-57.
1999
-
conference proceeding
-
Ground-based testing and demonstrations of starshades.
Proceedings of SPIE.
2016
- Surfing the L2 gradient with the starshade in search of extraterrestrial life 2016
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The Exo-S Probe Class Starshade Mission.
Proceedings of SPIE.
2015
-
X-ray monitoring for astrophysical applications on Cubesat.
Proceedings of SPIE.
2015
-
X-ray monitoring for astrophysical applications.
Proceedings of SPIE.
2014
-
Developments in the EM-CCD camera for OGRE.
Proceedings of SPIE.
2014
-
Design of Novel X-ray Optical System for Rocket Experiment.
Proceedings of SPIE.
2013
-
New Worlds Airship.
Proceedings of SPIE.
2013
-
Pushing the Boundaries of X-ray Grating Spectroscopy in a Suborbital Rocket.
Proceedings of SPIE.
2013
-
The OGRESS sounding rocket payload.
Proceedings of SPIE.
2013
-
Hybrid X-ray optical system for space astrophysics.
Proceedings of SPIE.
2013
-
Novel design of a large X-ray optical system for astrophysical application.
Proceedings of SPIE.
2012
- Demonstrating Exoplanet Coronagraphs. IEEE Aerospace Conference Proceedings. 2012
-
Development of off-plane gratings for WHIMex and IXO.
Proceedings of SPIE.
2011
-
X-ray Optics for WHIMEx, The Warm Hot Intergalactic Medium Explorer.
Proceedings of SPIE.
2011
-
Compact Optics for High Resolution Spectroscopy of Celestial X-ray Sources.
Proceedings of SPIE.
2011
-
Full-aperture X-ray tests of Kirkpatrick-Baez modules: preliminary results.
Proceedings of SPIE.
2011
-
The CODEX sounding rocket payload.
Proceedings of SPIE.
2011
-
Developments of the Off-Plane X-ray Grating Spectrometer for IXO.
Proceedings of SPIE.
2010
-
Results from the Extended X-ray Off-plane Spectrometer (EXOS) Sounding Rocket Payload.
Proceedings of SPIE.
2010
-
X-ray resolution tests of an off-plane reflection grating for IXO.
Proceedings of SPIE.
2010
-
Alternative Starshade Missions.
Proceedings of SPIE.
2010
-
Direct imaging and spectroscopy of habitable planets using JWST and a starshade.
Proceedings of SPIE.
2010
-
New Worlds Probe.
Proceedings of SPIE.
2010
- INVESTIGATION OF TARGET SELECTION SCHEMES FOR A SPACE TELESCOPE-OCCULTER SYSTEM IN THE SUN-EARTH L2 REGIME. Advances in the Astronautical Sciences. 1005-+. 2010
- The New Worlds Observer: The Astrophysics Strategic Mission Concept Study. 353-360. 2009
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Off-Plane Grating Spectrometer for the International X-ray Observatory.
Proceedings of SPIE.
2009
-
The EXOS Sounding Rocket Payload.
Proceedings of SPIE.
2009
-
The new worlds observer: The astrophysics strategic mission concept study.
EPJ Web of Conferences.
2009
-
Off-Plane X-ray Grating Spectrometer for the International X-ray Observatory.
Proceedings of SPIE.
2009
- Detailed Spectroscopy of Exoplanets Using the New Worlds Observer. 209-217. 2008
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Analysis of exoplanet light curves with the New Worlds Observer - art. no. 70103Y.
Proceedings of SPIE.
Y103-Y103.
2008
-
New Worlds Observer telescope and instrument optical design concepts.
Proceedings of SPIE.
2008
-
New Worlds Observer: Minotaur to Ares V.
Proceedings of SPIE.
2008
-
Off-plane reflection gratings for Constellation-X.
Proceedings of SPIE.
2008
-
Sensitivity analysis of the New Worlds starshade's shadow.
Proceedings of SPIE.
2008
-
The Milli-Arc-Second Structure Imager, MASSIM:TB A new concept for a high angular resolution X-ray telescope.
Proceedings of SPIE.
2008
-
The New Worlds Observer: Scientific and technical advantages of external occulters.
Proceedings of SPIE.
2008
-
The future of high angular resolution X-ray astronomy.
Proceedings of SPIE.
2008
-
Laboratory studies of petal-shaped occulters.
Proceedings of SPIE.
2007
-
External occulters for direct observation of exoplanets: An overview.
Proceedings of SPIE.
2007
-
Externally occulted terrestrial planet finder coronagraph: Simulations and sensitivities.
Proceedings of SPIE.
2007
-
High resolution soft X-ray spectroscopy for constellation X.
Proceedings of SPIE.
2007
-
New worlds observer tolerance overview.
Proceedings of SPIE.
2007
-
White light demonstration of one hundred parts per billion irradiance suppression in air by new starshade occulters.
Proceedings of SPIE.
2007
-
A sounding rocket payload for X-ray observations of the Cygnus Loop.
Proceedings of SPIE.
2006
-
High-resolution X-ray spectroscopy with the reflection grating spectrometer of Constellation-X - art. no. 62660C.
Proceedings of SPIE.
C2660-C2660.
2006
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Kirkpatrick Baez spectrograph concepts for future space missions - art. no. 626638.
Proceedings of SPIE.
26638-26638.
2006
-
Studies in thin diffraction gratings for flight applications.
Proceedings of SPIE.
2006
-
The new worlds observer: Using occulters to directly observe planets.
Proceedings of SPIE.
2006
-
Kirkpatrick-Baez optics for the Generation-X mission.
Proceedings of SPIE.
2005
-
Sounding rocket payload development for X-ray observations of the Cygnus Loop.
Proceedings of SPIE.
2005
-
High resolution x-ray spectroscopy of supernova remnants and the diffuse background.
Proceedings of SPIE.
136-147.
2004
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MAXIM science and technology.
Proceedings of SPIE.
199-211.
2004
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Off-plane grating mount tolerances for Constellation-X.
Proceedings of SPIE.
335-340.
2004
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Off-plane grating performance for Constellation-X.
Proceedings of SPIE.
302-312.
2004
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An X-ray test facility for diffraction gratings.
Proceedings of SPIE.
499-507.
2003
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Maxim Pathfinder: A practical configuration.
Proceedings of SPIE.
435-445.
2003
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Modeling optical performance of grazing incidence X-ray interferometers.
Proceedings of SPIE.
446-458.
2003
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X-ray performance of gratings in the extreme off-plane mount.
Proceedings of SPIE.
492-498.
2003
- X-ray interferometry. Astronomical Society of the Pacific Conference Series. 633-638. 2003
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Maxim: The Micro-Arcsecond X-ray Imaging Mission.
Proceedings of SPIE.
196-209.
2002
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MAXIM interferometer tolerances and tradeoffs.
Proceedings of SPIE.
568-577.
2002
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Off-plane gratings for Constellation-X.
Proceedings of SPIE.
549-556.
2002
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System performance evaluation of the MAXIM concept with integrated modeling.
Proceedings of SPIE.
557-567.
2002
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Alignment of a grazing incidence x-ray interferometer.
Proceedings of SPIE.
17-28.
2001
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X-ray interferometry: Ultra high resolution astronomy.
Proceedings of SPIE.
127-135.
2001
- The maxim mission: X-ray interferometry in the new century. 206-209. 2001
- The Maxim Pathfinder Mission: X-ray imaging at 100 micro-arcseconds. Astronomical Society of the Pacific Conference Series. 619-626. 2000
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High uniformity collimator for x-ray proximity lithography.
Proceedings of SPIE.
228-237.
2000
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Grazing incidence optics for x-ray interferometry.
Proceedings of SPIE.
456-466.
2000
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The Maxim Pathfinder Mission: X-ray imaging at 100 micro-arcseconds.
Proceedings of SPIE.
258-269.
2000
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High uniformity collimator for x-ray proximity lithography.
Proceedings of SPIE.
59-66.
1999
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Development of a grazing incidence x-ray interferometer.
Proceedings of SPIE.
291-299.
1999
- X-ray interferometry: Exciting science and feasible technology. IEEE Instrumentation and Measurement Technology Conference Proceedings. 1123-1128. 1999
- The mission tree. 317-321. 1998
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Sub-arcsec x-ray telescope for imaging the solar corona in the 0.25-1.2 keV band.
Proceedings of SPIE.
121-132.
1996
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ECHELLE CLASS SPECTROSCOPY WITH A SINGLE HOLOGRAPHIC GRATING.
Proceedings of SPIE.
484-487.
1993
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OPTIMIZED HOLOGRAPHIC GRATING SOLUTIONS FOR ROWLAND CIRCLE SPECTROGRAPHS.
Proceedings of SPIE.
361-364.
1993
-
Ground-based testing and demonstrations of starshades.
Proceedings of SPIE.
2016
-
journal article
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The high energy Universe at ultra-high resolution: the power and promise of X-ray interferometry.
Experimental Astronomy.
1081-1107.
2021
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Advances in edge diffraction algorithms.
Journal of the Optical Society of America A: Optics and Image Science, and Vision.
275-285.
2018
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High contrast observations of bright stars with a starshade.
Experimental Astronomy.
209-237.
2017
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SOFT X-RAY SPECTROSCOPY OF THE CYGNUS LOOP SUPERNOVA REMNANT.
The Astrophysical Journal (ApJ).
2013
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Limits on achievable intensity reduction with an optical occulter: comment.
Journal of the Optical Society of America A: Optics and Image Science, and Vision.
913-917.
2012
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The Search for Habitable Worlds. 1. The Viability of a Starshade Mission.
Publications of the Astronomical Society of the Pacific.
418-447.
2012
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DETECTING THE WARM-HOT INTERGALACTIC MEDIUM THROUGH X-RAY ABSORPTION LINES.
The Astrophysical Journal (ApJ).
2012
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ANALYTIC MODELING OF STARSHADES.
The Astrophysical Journal (ApJ).
2011
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A suborbital payload for soft X-ray spectroscopy of extended sources.
Experimental Astronomy.
23-44.
2011
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CONSTRUCTION OF AN EARTH MODEL: ANALYSIS OF EXOPLANET LIGHT CURVES AND MAPPING THE NEXT EARTH WITH THE NEW WORLDS OBSERVER.
The Astrophysical Journal (ApJ).
1428-1439.
2009
- Detecting Biosignatures of an Evolving Earth-Like Atmosphere via New Worlds Observer. Origins of Life and Evolution of Biospheres. 358-359. 2009
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Soft X-ray spectroscopy of the Cygnus Loop supernova remnant.
The Astrophysical Journal (ApJ).
328-335.
2008
-
Optical performance of the new worlds occulter.
Comptes Rendus Physique.
438-447.
2007
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Detection of Earth-like planets around nearby stars using a petal-shaped occulter.
Nature.
51-53.
2006
- High resolution X-ray spectroscopy: Is it interesting? Is it possible?. Symposium- International Astronomical Union. 790-792. 2005
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Imaging a black hole: MAXIM.
Advances in Space Research.
122-129.
2005
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X-ray interferometry.
Experimental Astronomy.
91-136.
2003
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Astronomy - A twisted look at the X-ray sky.
Nature.
644-647.
2001
- X-ray interferometry. Symposium- International Astronomical Union. 457-462. 2001
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Laboratory detection of X-ray fringes with a grazing-incidence interferometer.
Nature.
160-162.
2000
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Overview of the Far Ultraviolet Spectroscopic Explorer Mission.
The Astrophysical Journal (ApJ).
L1-L6.
2000
-
The scattering of X-rays by interstellar dust on the microarcsecond scale.
The Astrophysical Journal (ApJ).
306-309.
2000
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The 825-1110 angstrom EUV spectrum of Venus.
Icarus.
200-204.
1996
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ROCKET FUV OBSERVATIONS OF THE IO PLASMA TORUS DURING THE SHOEMAKER-LEVY/9 IMPACTS.
Geophysical Research Letters.
1837-1840.
1995
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FAR-ULTRAVIOLET SPECTROGRAPHS - THE IMPACT OF HOLOGRAPHIC GRATING DESIGN.
Applied Optics.
2241-2246.
1995
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A SEARCH FOR AN X-RAY-SCATTERING HALO AROUND SCORPIUS X-1.
The Astrophysical Journal (ApJ).
976-982.
1995
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THE EXTREME-ULTRAVIOLET SPECTROGRAPH - A RADIAL GROOVE GRATING, SOUNDING ROCKET-BORNE, ASTRONOMICAL INSTRUMENT.
Astrophysical Journal Supplement Series.
211-220.
1993
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EXTREME ULTRAVIOLET SPECTROSCOPY OF CAPELLA.
The Astrophysical Journal (ApJ).
L99-L102.
1992
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EXTREME ULTRAVIOLET SPECTROSCOPY OF G191-B2B - DIRECT OBSERVATION OF IONIZATION EDGES.
The Astrophysical Journal (ApJ).
L51-L54.
1992
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THE ANOMALOUS EXTINCTION CURVE IN THE DIRECTION OF RHO OPHIUCHI FROM 950-A TO 1180-A.
The Astrophysical Journal (ApJ).
289-294.
1992
- HELIUM AND ARGON ABUNDANCE CONSTRAINTS AND THE THERMAL EVOLUTION OF COMET AUSTIN (1989C1). Icarus. 157-161. 1992
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THE SPECTRUM OF COMET AUSTIN - REPLY.
Science.
452-453.
1991
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X-ray optics 2: A technique for high resolution spectroscopy.
Applied Optics.
1749-1749.
1991
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THE SPECTRUM OF COMET AUSTIN FROM 910 TO 1180-A.
Science.
408-410.
1991
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FUV and EUV spectrographs: Development in the 1980s for astronomy in the 1990s.
Advances in Space Research.
171-179.
1991
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Far ultraviolet spectrophotometry of BD +28 4211.
Advances in Space Research.
29-32.
1991
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FAR-ULTRAVIOLET SPECTROPHOTOMETRY OF SPICA.
The Astrophysical Journal (ApJ).
L81-L84.
1989
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A far ultraviolet rocket-borne spectrograph.
Experimental Astronomy.
123-143.
1989
-
Optical constants for thin films of C, diamond, Al, Si, and CVD SiC from 24 Å to 1216 Å.
Applied Optics.
279-279.
1988
-
Optical constants for thin films of Ti, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Hf, Ta, W, Re, Ir, Os, Pt, and Au from 24 Å to 1216 Å.
Applied Optics.
246-246.
1988
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X-RAY OPTICS - A TECHNIQUE FOR HIGH-RESOLUTION IMAGING.
Applied Optics.
2915-2920.
1987
-
ULTRAVIOLET AND X-RAY OBSERVATIONS OF NGC-2264.
The Astrophysical Journal (ApJ).
542-550.
1985
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Aspheric concave grating spectrographs.
Applied Optics.
4518-4518.
1984
-
Line profile variation in delta-Orionis A, l-Orionis A, and 15 Monocerotis.
The Astrophysical Journal (ApJ).
218-218.
1984
-
NEW APPLICATIONS OF X-RAY OPTICAL TECHNIQUES.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment.
251-264.
1984
-
X-ray spectrographs using radial groove gratings.
Applied Optics.
3971-3971.
1983
-
EINSTEIN OBSERVATIONS OF X-RAY-EMISSION FROM A-STARS.
The Astrophysical Journal (ApJ).
264-270.
1983
-
HIGH-EFFICIENCY SPECTROGRAPHS FOR THE EUV AND SOFT X-RAYS.
IEEE Transactions on Nuclear Science.
1535-1538.
1983
-
A STUDY OF X-RAY-EMISSION FROM AP AND AM STARS.
The Astrophysical Journal (ApJ).
L59-L62.
1982
-
ECHELLE SPECTROGRAPHS AT GRAZING-INCIDENCE.
Applied Optics.
710-717.
1982
- GRAZING-INCIDENCE OPTICS - NEW TECHNIQUES FOR HIGH-SENSITIVITY SPECTROSCOPY IN THE SPACE ULTRAVIOLET. 321-333. 1982
-
VERY HIGH X-RAY EFFICIENCY FROM A BLAZED GRATING.
Applied Optics.
17-18.
1982
-
THE DETECTION OF X-RAY VARIABILITY IN O-STARS.
The Astrophysical Journal (ApJ).
L19-L22.
1981
-
X-rays from RS Canum Venaticorum systems - A HEAO 1 survey and the development of a coronal model.
The Astrophysical Journal (ApJ).
212-212.
1980
- HR976 AND 4C34.13 - AN X-RAY ODD COUPLE. Astronomy and Astrophysics (A & A). L7-L8. 1980
- STALKING THE CYGNUS SUPERBUBBLE. Sky and telescope. 455-460. 1980
-
THE CORONAE OF 40 ERIDANI.
The Astrophysical Journal (ApJ).
L23-L26.
1980
-
THE X-RAY SUPERBUBBLE IN CYGNUS.
The Astrophysical Journal (ApJ).
L71-L76.
1980
-
WOLTER-SCHWARZSCHILD OPTICS FOR THE EXTREME ULTRAVIOLET - THE BERKELEY STELLAR SPECTROMETER AND THE EUV EXPLORER.
Optical Engineering.
211-218.
1980
-
Parameter estimation in astronomy through application of the likelihood ratio.
The Astrophysical Journal (ApJ).
939-939.
1979
-
DISCOVERY OF X-RAYS FROM THE 40-ERIDANI SYSTEM.
The Astrophysical Journal (ApJ).
L137-L140.
1979
-
X-RAY-EMISSION FROM AN AP-STAR (PHI-HERCULIS) AND A LATE B-STAR (PI-CETI).
The Astrophysical Journal (ApJ).
L111-L115.
1979
-
Extreme ultraviolet reflection efficiencies of diamond-turned aluminum, polished nickel, and evaporated gold surfaces.
Applied Optics.
3309-3309.
1978
-
The soft X-ray spectrum of Capella - Discovery of intense line emission.
The Astrophysical Journal (ApJ).
L21-L21.
1978
-
X-ray and radio emission from the compact galaxy III ZW 2.
The Astrophysical Journal (ApJ).
L91-L91.
1978
-
Extreme ultraviolet observation of Sirius - Evidence against a photospheric origin of the 0.25 keV flux.
The Astrophysical Journal (ApJ).
L87-L87.
1978
-
Possible detection of an extreme-ultraviolet source at 500 A.
The Astrophysical Journal (ApJ).
585-585.
1978
-
A soft X-ray map of the Perseus cluster of galaxies.
The Astrophysical Journal (ApJ).
L111-L111.
1976
-
An observation of the diffuse soft X-ray/extreme-ultraviolet background.
The Astrophysical Journal (ApJ).
L7-L7.
1976
-
Possible Detection of Very Soft X-Rays from SS Cygni.
The Astrophysical Journal (ApJ).
L5-L5.
1974
-
Discovery of a Central X-Ray Object in the Cygnus Loop.
The Astrophysical Journal (ApJ).
L115-L115.
1973
-
The high energy Universe at ultra-high resolution: the power and promise of X-ray interferometry.
Experimental Astronomy.
1081-1107.
2021
Background
education and training
- Ph.D., University of California-Berkeley 1977
- B.S., Massachusetts Institute of Technology 1973
International Activities
geographic focus
- China Country
- Czech Republic Country
- Europe Continent
- France Country
- Italy Country
- United Kingdom Country