Dr. Richard A. Kroeger Profile

Dr. Richard A. Kroeger

Astrophysicist

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 11 March 2003 Paper

Sensitivity of an advanced Compton telescope

Richard Kroeger, W. Neil Johnson, James Kurfess, Bernard Phlips, Eric Wulf

Proceedings Volume 4851, (2003) https://doi.org/10.1117/12.461474

KEYWORDS: Sensors, Gamma radiation, Silicon, Telescopes, Germanium, Doppler effect, Space telescopes, Xenon, Monte Carlo methods, Solids

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Proceedings Article | 22 October 1999 Paper

Technology development for the Constellation-X hard-x-ray telescope

Fiona Harrison, Walter Cook, Finn Christensen, Oberto Citterio, William Craig, Neil Gehrels, Paul Gorenstein, Jonathan Grindlay, Charles Hailey, Richard Kroeger, Hideyo Kunieda, Giovanni Pareschi, Ann Parsons, Robert Petre, Suzanne Romaine, Brian Ramsey, Jack Tueller, Melville Ulmer, Martin Weisskopf, David Windt

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366492

KEYWORDS: Sensors, Mirrors, Hard x-rays, Reflectivity, Glasses, Nickel, X-ray optics, X-ray telescopes, Multilayers, X-rays

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Proceedings Article | 19 October 1999 Paper

Position resolution in a Ge-strip detector

Michael Momayezi, William Warburton, Richard Kroeger

Proceedings Volume 3768, (1999) https://doi.org/10.1117/12.366628

KEYWORDS: Sensors, Electronics, Germanium, Capacitance, Compton scattering, Mirrors, Signal attenuation, Signal detection, Time metrology, Algorithm development

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Proceedings Article | 10 November 1998 Paper

Mixed-signal custom integrated circuit development for physics instrumentation

Charles Britton, W. Bryan, Mike Emery, S. Frank, M. Ericson, Usha Jagadish, J. Moore, Marc Simpson, M. Smith, Alan Wintenberg, G. Young, Richard Kroeger, W. Neil Johnson, James Kurfess, Willi Schwarz, Michael Read

Proceedings Volume 3445, (1998) https://doi.org/10.1117/12.330289

KEYWORDS: Sensors, Electronics, Analog electronics, Capacitors, Amplifiers, Germanium, Clocks, Integrated circuits, Resistors, Switches

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The Monolithic Systems Development Group at the Oak Ridge National Laboratory has been greatly involved in custom mixed-mode integrated circuit development for the PHIENIX detector at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory and position-sensitive germanium spectrometer front-ends for the Naval Research Laboratory (NRL). This paper will outline the work done for both PHENIX and the Naval Research Laboratory in the area of full-custom, mixed-signal CMOS integrated electronics. The PHENIX detector is a large multi-component detector at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory. PHENIX has over 400,000 channels of electronics, most of which is implemented using custom integrated circuits. We presently have responsibility for developing and manufacturing electronics for the event vertexfinding subsystem, the pads tracking subsystem, the electromagnetic calorimeter subsystem, and the muon tracking/identification subsystems. We have developed an architecture utilizing simultaneous read-write analog memories used throughout the detector that allows data to be continuously taken even during event readout (a deadtime-less system). The manufacturing technologies being used range from multi-layer printed-circuit boards to multi-layer, multi-chip modules (MCMs). The germanium spectrometer electronics for the Naval Research Laboratory consist of low-noise preamplifier-shapers-peak stretchers and discriminators. The preamplifiers have been optimized for detector capacitances of approximately 10 pF and shaping times of 5-10 .ts. This paper will present the architectures chosen for the various PHENIX detectors which include position-sensitive silicon, capacitive pixel, and phototube detectors, and performance results for the subsystems as well as a system description of the NRL germanium strip system and its performance. The performance of the custom preamplifiers, discriminators, analog memories, analog-digital converters, and control circuitry for all systems will be presented.

Keywords: Physics, electronics, CMOS

Proceedings Article | 18 October 1996 Paper

Advanced Thin Ionization Calorimeter (ATIC) balloon experiment: expected performance

Eun-Suk Seo, James Adams, G. Bashindzhagyan, Oleksy Dudnik, Ali Fazely, L. Garcia, Naum Grigorov, T. Gregory Guzik, Susan Inderhees, Joachim Isbert, H. Jung, L. Khein, Sun-Kee Kim, Richard Kroeger, Frank McDonald, Mikhail Panasyuk, Choong-Soo Park, Wolfgang Schmidt, Cynthia Dion-Schwartz, Vitalij Senchishin, J. Wang, John Wefel, Viktor Zatsepin, Sonny Zinn

Proceedings Volume 2806, (1996) https://doi.org/10.1117/12.253973

KEYWORDS: Particles, Sensors, Silicon, Helium, Iron, Scintillators, Ionization, Physics, Carbon, Electromagnetism

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Proceedings Article | 18 October 1996 Paper

Burst locations with an arc second telescope (BLAST)

W. Neil Johnson, Charles Dermer, J. E. Grove, Paul Hertz, Robert Kinzer, Richard Kroeger, James Kurfess, Michael Lovellette, G. Share, Mark Strickman, Kent Wood, Susan Inderhees, Bernard Phlips, Dieter Hartmann, Mark Leising, Gerald Fishman, Charles Meegan, Edward Fenimore

Proceedings Volume 2806, (1996) https://doi.org/10.1117/12.253994

KEYWORDS: Sensors, Telescopes, Space telescopes, Gamma radiation, Hard x-rays, X-rays, Galactic astronomy, Coded apertures, Stars, Computed tomography

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Proceedings Article | 18 October 1996 Paper

Gamma-ray instrument for polarimetry, spectroscopy, and imaging (GIPSI)

Richard Kroeger, W. Neil Johnson, Robert Kinzer, James Kurfess, Susan Inderhees, Bernard Phlips, Brad Graham

Proceedings Volume 2806, (1996) https://doi.org/10.1117/12.254024

KEYWORDS: Sensors, Polarization, Polarimetry, Imaging spectroscopy, Modulation, Scattering, Solar processes, Germanium, Gamma radiation, Space operations

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Proceedings Article | 18 October 1996 Paper

Advanced Thin Ionization Calorimeter (ATIC) balloon experiment: instrumentation

T. Gregory Guzik, James Adams, G. Bashindzhagyan, Oleksy Dudnik, Steven Ellison, Ali Fazely, L. Garcia, Naum Grigorov, Susan Inderhees, Joachim Isbert, H. Jung, L. Khein, Sun-Kee Kim, Richard Kroeger, R. Lockwood, Frank McDonald, Mikhail Panasyuk, Choong-Soo Park, B. Price, Wolfgang Schmidt, Cynthia Dion-Schwartz, Vitalij Senchishin, Eun-Suk Seo, John Wefel, J. Wang, Viktor Zatsepin, Sonny Zinn

Proceedings Volume 2806, (1996) https://doi.org/10.1117/12.253972

KEYWORDS: Sensors, Particles, Silicon, Crystals, Scintillators, Electronics, Ionization, Signal detection, Control systems, Helium

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Proceedings Article | 12 October 1996 Paper

Hard x-ray telescope mission

Paul Gorenstein, D. Worrall, Karsten Joensen, Suzanne Romaine, Martin Weisskopf, Brian Ramsey, James Bilbro, Richard Kroeger, Neil Gehrels, Ann Parsons, Robert Smither, Finn Christensen, Oberto Citterio, Peter von Ballmoos

Proceedings Volume 2807, (1996) https://doi.org/10.1117/12.255094

KEYWORDS: Sensors, Space telescopes, Crystals, X-ray telescopes, Mirrors, Telescopes, Hard x-rays, Multilayers, Spatial resolution, X-rays

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Proceedings Article | 1 September 1995 Paper

Spatial resolution and imaging of gamma rays with germanium strip detectors

Richard Kroeger, W. Neil Johnson, Robert Kinzer, James Kurfess, Susan Inderhees, Bernard Phlips, Neil Gehrels, Brad Graham

Proceedings Volume 2518, (1995) https://doi.org/10.1117/12.218379

KEYWORDS: Sensors, Germanium, Lithium, Electrodes, Spatial resolution, Space telescopes, Telescopes, Boron, Gamma radiation, Image resolution

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Proceedings Article | 1 September 1995 Paper

Advanced telescope for high-energy nuclear astrophysics (ATHENA)

W. Neil Johnson, Charles Dermer, Richard Kroeger, James Kurfess, Neil Gehrels, Jonathan Grindlay, Mark Leising, Thomas Prince, William Purcell, James Ryan, Tumay Tumer

Proceedings Volume 2518, (1995) https://doi.org/10.1117/12.218406

KEYWORDS: Sensors, Telescopes, Germanium, Gamma radiation, Space telescopes, Spatial resolution, Imaging spectroscopy, Spectral resolution, Spectroscopy, Space operations

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Showing 5 of 11 publications

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