Dr. John E. Sadleir Profile

Dr. John E. Sadleir

at NASA Goddard Space Flight Ctr

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Author

Publications (14)

SPIE Journal Paper | 23 May 2024 Open Access

Scientific impact of a noiseless energy-resolving detector for a future exoplanet-imaging mission

Alex Howe, Christopher Stark, John Sadleir

JATIS, Vol. 10, Issue 02, 025008, (May 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.2.025008

KEYWORDS: Planets, Sensors, Electron multiplying charge coupled devices, Stars, Coronagraphy, Exoplanets, Astronomical bodies, Equipment, Photons, Iterated function systems

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SPIE Journal Paper | 9 January 2021 Open Access

Transition-edge sensor detectors for the Origins Space Telescope

Peter Nagler, John Sadleir, Edward Wollack

JATIS, Vol. 7, Issue 01, 011005, (January 2021) https://doi.org/10.1117/12.10.1117/1.JATIS.7.1.011005

KEYWORDS: Sensors, Bolometers, Space telescopes, Antennas, Phonons, Photon counting, Resistance, Electroluminescence, Temperature metrology, Superconductors

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SPIE Journal Paper | 8 April 2019 Open Access

Multiabsorber transition-edge sensors for x-ray astronomy

Stephen J. Smith, Joseph Adams, Simon Bandler, James Chervenak, Aaron Datesman, Megan Eckart, Fred Finkbeiner, Ruslan Hummatov, Richard Kelley, Caroline Kilbourne, Antoine Miniussi, Frederick Porter, John Sadleir, Kazuhiro Sakai, Nicholas Wakeham, Edward Wassell

JATIS, Vol. 5, Issue 02, 021008, (April 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.021008

KEYWORDS: Sensors, X-rays, X-ray astronomy, Image resolution, Gold, Lithium, Phonons, Signal to noise ratio, Digital filtering, Resistance

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Proceedings Article | 12 July 2018 Paper

Development of transition edge sensor detectors optimized for single-photon spectroscopy in the optical and near-infrared

Peter Nagler, Matthew Greenhouse, S. Harvey Moseley, Bernard Rauscher, John Sadleir

Proceedings Volume 10709, 1070931 (2018) https://doi.org/10.1117/12.2313730

KEYWORDS: Sensors, Spectral resolution, Single photon detectors, Thermodynamics, Semiconductors, Ultraviolet radiation, Near infrared, Spectroscopes, Spectroscopy, Optical spectroscopy

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Proceedings Article | 10 July 2018 Presentation

Transition-edge sensor array development for the ATHENA x-ray itegral field unit (Conference Presentation)

Stephen Smith, Joesph Adams, Simon Bandler, James Chervenak, Megan Eckart, Fred Finkbeiner, Richard Kelley, Caroline Kilbourne, Antoine Miniussi, F. Scott Porter, John Sadleir, Kazuhiro Sakai, Nicholas Wakeham, Edward Wassell, Wonsik Yoon, Hiroki Akamatsu, Luciano Gottardi, Roland den Hartog, Brian Jackson, Jan van der Kuur

Proceedings Volume 10699, 106991L (2018) https://doi.org/10.1117/12.2313428

KEYWORDS: X-rays, Sensors, Transition metals, Observatories, Spectral resolution, Multiplexing, Fused deposition modeling, Telescopes, Metals

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The X-ray integral field unit (X-IFU) proposed for ESA’s Athena X-ray observatory will consist of 3840 transition edge sensor (TES) microcalorimeters optimized for the energy range of 0.2 to 12 keV. The instrument will provide unprecedented spectral resolution of ~ 2.5 eV at energies of up to 7 keV and will accommodate photon fluxes of 10’s mcrab (1000’s cps). Over the past two years the baseline configuration has evolved from the original proposal. The current baseline consists of a uniform large pixel array (LPA) of 5” pixels, AC-biased within their superconducting-to-normal transition and read out using frequency domain multiplexing (FDM). The baseline pixel design is approximately a factor of two times slower than in the original concept. High count-rate accommodation, needed for bright point source observations, is now achieved by defocusing the telescope optic to spread the photons over a larger number of pixels. In this paper we report on Mo/Au TES designs that are being optimized to meet the baseline pixel parameters and performance goals. This includes detailed studies on the optimization of the thermal heat sink and the impact of different TES geometries (including TES size and normal metal feature geometries) on the DC-biased transition shape. We discuss how these geometric effects ultimately impact important performance metrics such as energy resolution, decay time, slew-rate and array scale uniformity. Our Mo/Au TESs have historically been designed and optimized for DC-biased operation, however, the primary readout technology uses an AC drive to bias the TES. Depending upon the drive frequency, the AC bias affects the TES transition shape in two ways. Firstly, due to losses from the bias current coupling to metallic components in close proximity to the TES and secondly introducing fine structure in the transition due to Josephson effects. We present latest pixel design optimizations targeted at mitigating these frequency dependent effects in order to achieve commensurate performance with that obtained in the DC case.

SPIE Journal Paper | 15 August 2016 Open Access

Detectors and cooling technology for direct spectroscopic biosignature characterization

Bernard Rauscher, Edgar Canavan, Samuel Moseley, John Sadleir, Thomas Stevenson

JATIS, Vol. 2, Issue 04, 041212, (August 2016) https://doi.org/10.1117/12.10.1117/1.JATIS.2.4.041212

KEYWORDS: Sensors, Mercury cadmium telluride, Single photon detectors, Electron multiplying charge coupled devices, Spectral resolution, Superconductors, Quasiparticles, Helium, Spectroscopes, Space telescopes

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Proceedings Article | 20 July 2016 Paper

Transition-edge sensor pixel parameter design of the microcalorimeter array for the x-ray integral field unit on Athena

S. Smith, J. Adams, S. Bandler, G. Betancourt-Martinez, J. Chervenak, M. Chiao, M. Eckart, F. Finkbeiner, R. Kelley, C. Kilbourne, A. Miniussi, F. Porter, J. Sadleir, K. Sakai, N. Wakeham, E. Wassell, W. Yoon, D. Bennett, W. Doriese, J. Fowler, G. Hilton, K. Morgan, C. Pappas, C. Reintsema, D. Swetz, J. Ullom, K. Irwin, H. Akamatsu, L. Gottardi, R. den Hartog, B. Jackson, J. van der Kuur, D. Barret, P. Peille

Proceedings Volume 9905, 99052H (2016) https://doi.org/10.1117/12.2231749

KEYWORDS: X-rays, Sensors, Multiplexing, Sensors, Staring arrays, Cryogenics, Helium, Magnetism, Photons, Temperature metrology, Resistance

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Proceedings Article | 19 July 2016 Paper

Development of x-ray microcalorimeter imaging spectrometers for the X-ray Surveyor mission concept

Simon Bandler, Joseph Adams, James Chervenak, Aaron Datesman, Megan Eckart, Fred Finkbeiner, Richard Kelley, Caroline Kilbourne, Gabriele Betancourt-Martinez, Antoine Miniussi, Frederick Porter, John Sadleir, Kazuhiro Sakai, Stephen Smith, Thomas Stevenson, Nicholas Wakeham, Edward Wassell, Wonsik Yoon, Dan Becker, Douglas Bennett, William Doriese, Joseph Fowler, Johnathan Gard, Gene Hilton, Benjamin Mates, Kelsey Morgan, Carl Reintsema, Daniel Swetz, Joel Ullom, Saptarshi Chaudhuri, Kent Irwin, Sang-Jun Lee, Alexey Vikhlinin

Proceedings Volume 9905, 99050Q (2016) https://doi.org/10.1117/12.2232156

KEYWORDS: Sensors, X-rays, Tantalum, Superconductors, Computer aided design, Silver, Matrices, Field effect transistors, Electronics, Spectral resolution

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Proceedings Article | 30 July 2010 Paper

High-spectral resolution high-cadence imaging x-ray microcalorimeters for solar physics

Simon Bandler, Catherine Bailey, Jay Bookbinder, Edward DeLuca, Jay Chervenak, Megan Eckart, Fred Finkbeiner, Daniel Kelley, Richard Kelley, Caroline Kilbourne, Frederick Porter, John Sadleir, Stephen Smith, Randall Smith

Proceedings Volume 7732, 773238 (2010) https://doi.org/10.1117/12.857783

KEYWORDS: X-rays, Sensors, Solar processes, Plasma, Image resolution, Solar energy, Gold, Imaging spectroscopy, Rockets, X-ray imaging

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Proceedings Article | 15 July 2008 Paper

Development of arrays of position-sensitive microcalorimeters for Constellation-X

Stephen Smith, Simon Bandler, Regis Brekosky, Ari-D. Brown, James Chervenak, Megan Eckart, Enectali Figueroa-Feliciano, Fred Finkbeiner, Richard Kelley, Caroline Kilbourne, F. Scott Porter, John Sadleir

Proceedings Volume 7011, 701126 (2008) https://doi.org/10.1117/12.790100

KEYWORDS: Image resolution, Semiconducting wafers, Sensors, Tellurium, Gold, X-rays, Composites, Bismuth, Optimal filtering, Silicon

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Proceedings Article | 15 June 2006 Paper

Expanding the Constellation-X field of view with position-sensitive x-ray microcalorimeters

E. Figueroa-Feliciano, S. Bandler, K. Boyce, R. Brekosky, J. Chervenak, F. Finkbeiner, N. Iyomoto, R. Kelley, C. Kilbourne, F. Porter, T. Saab, J. Sadleir

Proceedings Volume 6276, 627615 (2006) https://doi.org/10.1117/12.672257

KEYWORDS: Photons, Sensors, X-rays, Multiplexers, Point spread functions, Multiplexing, Staring arrays, Physics, Amplifiers, Mirrors

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Proceedings Article | 13 June 2006 Paper

High-density arrays of x-ray microcalorimeters for Constellation-X

Caroline Kilbourne, Simon Bandler, Ari Brown, James Chervenak, Enectali Figueroa-Feliciano, Fred Finkbeiner, Naoko Iyomoto, Richard Kelley, F. Scott Porter, Tarek Saab, John Sadleir, Jennifer White

Proceedings Volume 6266, 626621 (2006) https://doi.org/10.1117/12.672419

KEYWORDS: Bismuth, Gold, X-rays, Diffusion, Sensors, Interfaces, Superconductors, Copper, Molybdenum, Metals

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Proceedings Article | 29 September 2004 Paper

Optimization of X-ray absorbers for TES microcalorimeters

Naoko Iyomoto, John Sadleir, Enectali Figueroa-Feliciano, Tarek Saab, Simon Bandler, Caroline Kilbourne, James Chervenak, Dorothy Talley, Fred Finkbeiner, Regis Brekosky, Mark Lindeman, Richard Kelley, Frederick Porter, Kevin Boyce

Proceedings Volume 5501, (2004) https://doi.org/10.1117/12.552063

KEYWORDS: Bismuth, Copper, X-rays, Diffusion, Resistance, Annealing, Imaging spectroscopy, Scanning electron microscopy, X-ray imaging, Silicon

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Proceedings Article | 29 September 2004 Paper

Position-sensitive microcalorimeters

John Sadleir, Enectali Figueroa-Feliciano, Tarek Saab, Naoko Iyomoto, Mark Lindeman, Simon Bandler, Caroline Kilbourne, Frederick Porter, Richard Kelley, Fred Finkbeiner, James Chervenak

Proceedings Volume 5501, (2004) https://doi.org/10.1117/12.552311

KEYWORDS: Data modeling, Sensors, X-rays, Gold, Instrument modeling, Silicon, Bismuth, Multiplexers, Solids, Resistance

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Showing 5 of 14 publications

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