Dr. Branden E. Allen Profile

Dr. Branden E. Allen

at Harvard-Smithsonian Ctr for Astrophysics

SPIE Involvement:

Author

Publications (21)

SPIE Journal Paper | 24 March 2023

Imaging effects due to pixel distortions in CdZnTe detectors—results from the HREXI Calibration Facility

Arkadip Basak, Branden Allen, Jae Sub Hong, Daniel Violette, Jonathan Grindlay

JATIS, Vol. 9, Issue 01, 018005, (March 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.018005

KEYWORDS: Image restoration, Telescopes, Signal to noise ratio, X-rays, Detector arrays, Calibration, X-ray sources, X-ray detectors, Spatial resolution, Detector development

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SPIE Journal Paper | 31 January 2023

Tuning of nuclear spectroscopic telescope array application specific integrated circuits to improve low energy threshold of future hard x-ray imaging detectors

Daniel Violette, Branden Allen, Jae Sub Hong, Hiromasa Miyasaka, Jonathan Grindlay

JATIS, Vol. 9, Issue 01, 016001, (January 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.016001

KEYWORDS: Application specific integrated circuits, Image resolution, Telescopes, Detector arrays, X-ray telescopes, Analog electronics, Spectroscopy, Pixel resolution, Spectroscopes, Capacitors

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SPIE Journal Paper | 4 July 2022

Testing station for fast screening of through silicon via-enabled application-specific integrated circuits for hard x-ray imaging detectors

Daniel Violette, Branden Allen, Jaesub Hong, Hiromasa Miyasaka, Jonathan Grindlay

JATIS, Vol. 8, Issue 03, 036001, (July 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.036001

KEYWORDS: Sensors, Silicon, Wafer testing, Image resolution, Semiconducting wafers, Hard x-rays, Detector arrays, Application specific integrated circuits, X-rays, X-ray telescopes

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SPIE Journal Paper | 22 December 2021

Performance of a directly deposited optical blocking filter on x-ray CCDs: case study from the REgolith X-ray Imaging Spectrometer (REXIS) experiment

Carolyn Thayer, Rebecca Masterson, Branden Allen, Kevin Ryu, Marshall Bautz, Solan Megerssa, Mark Chodas, David Guevel, Daniel Hoak, Jaesub Hong, Madeline Lambert, Jonathan Grindlay, Richard Binzel

JATIS, Vol. 7, Issue 04, 046001, (December 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.4.046001

KEYWORDS: Charge-coupled devices, X-rays, X-ray optics, Sensors, Asteroids, Optical filters, X-ray imaging, High power microwaves, Spectroscopy, Environmental sensing

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Proceedings Article | 5 August 2021 Presentation

Optimization of CdZnTe low energy threshold utilizing readout ASIC charge pumping for the High-Resolution Energetic X-ray Imager SmallSat Explorer

Daniel Violette, Jaesub Hong, Branden Allen, Jonathan Grindlay

Proceedings Volume 11821, 118210S (2021) https://doi.org/10.1117/12.2594853

KEYWORDS: X-ray imaging, Sensors, Hard x-rays, X-rays, X-ray telescopes, X-ray detectors, Telescopes, Stars, Spectroscopy, Spectral resolution

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SPIE Journal Paper | 9 April 2021

Proof of concept for through silicon vias in application-specific integrated circuits for hard x-ray imaging detectors

Jaesub Hong, Jonathan Grindlay, Branden Allen, Daniel Violette, Hiromasa Miyasaka, Dean Malta, Jennifer Ovental, David Bordelon, Daniel Richter

JATIS, Vol. 7, Issue 02, 026001, (April 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.2.026001

KEYWORDS: Sensors, Semiconducting wafers, Silicon, Application specific integrated circuits, Copper, Signal processing, Etching, X-ray telescopes, Spectral resolution, Packaging

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SPIE Journal Paper | 22 April 2020

HREXI calibration facility: mapping out subpixel-level responses from high-resolution cadmium zinc telluride imaging x-ray detectors

Arkadip Basak, Branden Allen, Jaesub Hong, Daniel Violette, Jonathan Grindlay

JATIS, Vol. 6, Issue 02, 026002, (April 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.2.026002

KEYWORDS: Sensors, Calibration, Tungsten, X-ray detectors, X-rays, Cadmium, Zinc, Lead, Aluminum, Detector development

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Proceedings Article | 9 September 2019 Presentation

Efficient screening of through-silicon-via (TSV) ASICs for CZT x-ray imaging detectors (Conference Presentation)

Daniel Violette, Branden Allen, Jaesub Hong, Jonathan Grindlay

Proceedings Volume 11118, 1111805 (2019) https://doi.org/10.1117/12.2529819

KEYWORDS: Sensors, X-ray imaging, Image sensors, Image resolution, X-ray telescopes, X-ray sources, Crystals, Electronics, Spectroscopy, Telescopes

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Proceedings Article | 9 September 2019 Presentation

High-resolution x-ray imaging spectrometer (HREXI) SmallSat Pathfinder (HSP) (Conference Presentation)

Jonathan Grindlay, Branden Allen, Jaesub Hong, Daniel Violette, Martin Elvis, Scott Barthelmy, John Tomsick

Proceedings Volume 11118, 111180X (2019) https://doi.org/10.1117/12.2529855

KEYWORDS: Image resolution, X-ray imaging, Spectroscopy, Coded apertures, X-rays, Astrophysics, Imaging systems, Telescopes, Sensors, Coded aperture imaging

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Proceedings Article | 13 September 2018 Presentation + Paper

Efficient validation testing of Through-Silicon-Via (TSV) ASICs for CZT x-ray detectors

Daniel Violette, Branden Allen, Jae Sub Hong, Arkadip Basak, Jonathan Grindlay

Proceedings Volume 10762, 107620S (2018) https://doi.org/10.1117/12.2321694

KEYWORDS: Sensors, X-ray telescopes, Field programmable gate arrays, Semiconducting wafers, X-ray detectors, Crystals, Aluminum, Coded apertures, Spectroscopy, Telescopes

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Proceedings Article | 15 September 2017 Presentation + Paper

Through-Silicon-Vias (TSVs) for 3D readout of ASIC for nearly gapless CdZnTe detector arrays

J. Hong, B. Allen, J. Grindlay, Hiromasa Miyasaka, Jill Burnham, Sangki Hong, Wesker Lei, Scott Barthelmy, Robert Patti, Fiona Harrison

Proceedings Volume 10392, 103920U (2017) https://doi.org/10.1117/12.2274360

KEYWORDS: Sensors, Semiconducting wafers, Plating, Space telescopes, Crystals, Copper, Scanning electron microscopy, Etching, Telescopes, Metals

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Proceedings Article | 19 September 2014 Paper

Modeling the expected performance of the REgolith x-ray imaging spectrometer (REXIS)

Niraj Inamdar, Richard Binzel, Jae Sub Hong, Branden Allen, Jonathan Grindlay, Rebecca Masterson

Proceedings Volume 9222, 922207 (2014) https://doi.org/10.1117/12.2062202

KEYWORDS: Sensors, Asteroids, Calibration, X-rays, Sun, Charge-coupled devices, Error analysis, Spectroscopy, Data modeling, Solids

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Proceedings Article | 27 September 2013 Paper

The REgolith X-Ray Imaging Spectrometer (REXIS) for OSIRIS-REx: identifying regional elemental enrichment on asteroids

Branden Allen, Jonathan Grindlay, Jaesub Hong, Richard Binzel, Rebecca Masterson, Niraj Inamdar, Mark Chodas, Matthew Smith, Marshall Bautz, Steven Kissel, Joel Villasenor, Miruna Oprescu, Nicholas Induni

Proceedings Volume 8840, 88400M (2013) https://doi.org/10.1117/12.2041715

KEYWORDS: Asteroids, Sensors, X-rays, Charge-coupled devices, Collimators, Coded apertures, Spatial resolution, Space operations, X-ray imaging, Spectroscopy

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Proceedings Article | 17 September 2010 Paper

Overview of EXIST mission science and implementation

J. Grindlay, N. Gehrels, J. Bloom, P. Coppi, Al. Soderberg, J. Hong, B. Allen, S. Barthelmy, G. Tagliaferri, H. Moseley, A. Kutyrev, G. Fabbiano, G. Fishman, B. Ramsey, R. Della Ceca, L. Natalucci, P. Ubertini

Proceedings Volume 7732, 77321X (2010) https://doi.org/10.1117/12.857895

KEYWORDS: Telescopes, Stars, Galactic astronomy, Space telescopes, Imaging spectroscopy, X-rays, Spectroscopy, Sensors, Space operations, Hard x-rays

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Proceedings Article | 10 August 2010 Paper

The design and capabilities of the EXIST optical and infra-red telescope (IRT)

A. Kutyrev, S. H. Moseley, C. Golisano, Q. Gong, B. Allen, N. Gehrels, J. Grindlay, J. S. Hong, B. Woodgate

Proceedings Volume 7731, 77311Z (2010) https://doi.org/10.1117/12.858309

KEYWORDS: Sensors, Space telescopes, Telescopes, Image resolution, Imaging spectroscopy, Spectroscopes, Spectroscopy, Observatories, Infrared telescopes, Optical instrument design

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Proceedings Article | 30 July 2010 Paper

ProtoEXIST: advanced prototype CZT coded aperture telescopes for EXIST

Branden Allen, Jaesub Hong, Josh Grindlay, Scott Barthelmy, Robert Baker, Neil Gehrels, Trey Garson, Henric Krawczynski, Walter Cook, Fiona Harrison, Jeffrey Apple, Brian Ramsey

Proceedings Volume 7732, 77324D (2010) https://doi.org/10.1117/12.857940

KEYWORDS: Sensors, Telescopes, Space telescopes, Calibration, Stars, Coded apertures, Cameras, Control systems, Magnetometers, Crystals

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Proceedings Article | 30 July 2010 Paper

The proposed high-energy telescope (HET) for EXIST

J. Hong, J. Grindlay, B. Allen, G. Skinner, S. Barthelmy, N. Gehrels, A. Garson, H. Krawczynski, W. Cook, F. Harrison, L. Natalucci, P. Ubertini

Proceedings Volume 7732, 77321Y (2010) https://doi.org/10.1117/12.857713

KEYWORDS: Sensors, X-ray telescopes, Crystals, Hard x-rays, Telescopes, Space telescopes, Photomasks, Electronics, X-ray imaging, Field programmable gate arrays

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Proceedings Article | 3 September 2009 Paper

The high energy telescope on EXIST

J. Hong, J. Grindlay, B. Allen, S. Barthelmy, G. Skinner, N. Gehrels

Proceedings Volume 7435, 74350A (2009) https://doi.org/10.1117/12.826540

KEYWORDS: Sensors, Space telescopes, Image processing, X-ray telescopes, Tungsten, X-rays, Telescopes, X-ray imaging, Crystals, Imaging spectroscopy

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Proceedings Article | 2 September 2009 Paper

The EXIST optical and infra-red telescope (IRT) and imager-spectrometer

A. Kutyrev, S. Moseley, C. Golisano, Q. Gong, B. Allen, N. Gehrels, J. Grindlay, J. S. Hong, B. Woodgate

Proceedings Volume 7453, 745304 (2009) https://doi.org/10.1117/12.826888

KEYWORDS: Sensors, Space telescopes, Telescopes, Image resolution, Imaging spectroscopy, Spectroscopy, Spectroscopes, Infrared sensors, X-ray telescopes, Infrared imaging

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Proceedings Article | 21 August 2009 Paper

Imaging and burst location with the EXIST high-energy telescope

Gerald Skinner, Scott Barthelmy, Mark Finger, Jae Sub Hong, Garrett Jernigan, Steven Sturner, Branden Allen, Jonathan Grindlay

Proceedings Volume 7435, 74350B (2009) https://doi.org/10.1117/12.830184

KEYWORDS: Sensors, Space telescopes, Telescopes, Gamma radiation, Space operations, Spatial resolution, Image restoration, X-rays, Detector arrays, Point spread functions

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The primary instrument of the proposed EXIST mission is a coded mask high energy telescope (the HET), that must have a wide field of view and extremely good sensitivity. In order to achieve the performance goals it will be crucial to minimize systematic errors so that even for very long total integration times the imaging performance is close to the statistical photon limit. There is also a requirement to be able to reconstruct images on-board in near real time in order to detect and localize gamma-ray bursts, as is currently being done by the BAT instrument on Swift. However for EXIST this must be done while the spacecraft is continuously scanning the sky. The scanning provides all-sky coverage and is also a key part of the strategy to reduce systematic errors. The on-board computational problem is made even more challenging for EXIST by the very large number of detector pixels (more than 107, compared with 32768 for BAT). The EXIST HET Imaging Technical Working Group has investigated and compared numerous alternative designs for the HET. The selected baseline concept meets all of the scientific requirements, while being compatible with spacecraft and launch constraints and with those imposed by the infra-red and soft X-ray telescopes that constitute the other key parts of the payload. The approach adopted depends on a unique coded mask with two spatial scales. Coarse elements in the mask are effective over the entire energy band of the instrument and are used to initially locate gamma-ray bursts. A finer mask component provides the good angular resolution needed to refine the burst position and reduces the cosmic X-ray background; it is optimized for operation at low energies and becomes transparent in the upper part of the energy band where an open fraction of 50% is optimal. Monte Carlo simulations and analytic analysis techniques have been used to demonstrate the capabilities of the proposed design and of the two-step burst localization procedure.

Proceedings Article | 21 September 2007 Paper

Wide-field hard x-ray survey telescope: ProtoEXIST1

J. Hong, J. Grindlay, N. Chammas, B. Allen, A. Copete, B. Said, M. Burke, J. Howell, T. Gauron, R. Baker, S. Barthelmy, S. Sheikh, N. Gehrels, W. Cook, J. Burnham, F. Harrison, J. Collins, S. Labov, A. Garson, H. Krawczynski

Proceedings Volume 6706, 67060B (2007) https://doi.org/10.1117/12.736110

KEYWORDS: Sensors, Telescopes, Space telescopes, Electronics, X-ray telescopes, Crystals, Field programmable gate arrays, Hard x-rays, Image resolution, X-rays

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Showing 5 of 21 publications

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