Dr. Gordon J. Hurford Profile

Dr. Gordon J. Hurford

Research Physicist at Univ of California Berkeley

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 18 July 2016 Open Access

First flight of the Gamma-Ray Imager/Polarimeter for Solar flares (GRIPS) instrument

Nicole Duncan, P. Saint-Hilaire, A. Shih, G. Hurford, H. Bain, M. Amman, B. Mochizuki, J. Hoberman, J. Olson, B. Maruca, N. Godbole, D. Smith, J. Sample, N. Kelley, A. Zoglauer, A. Caspi, P. Kaufmann, S. Boggs, R. Lin

Proceedings Volume 9905, 99052Q (2016) https://doi.org/10.1117/12.2233859

KEYWORDS: Gamma radiation, Solar energy, Imaging spectroscopy, Imaging systems, Sensors, Sun, Calibration, Ions, Spectroscopy, Photons

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The Gamma-Ray Imager/Polarimeter for Solar flares (GRIPS) instrument is a balloon-borne telescope designed to study solar- are particle acceleration and transport. We describe GRIPS's first Antarctic long-duration flight in January 2016 and report preliminary calibration and science results. Electron and ion dynamics, particle abundances and the ambient plasma conditions in solar flares can be understood by examining hard X-ray (HXR) and gamma-ray emission (20 keV to 10 MeV). Enhanced imaging, spectroscopy and polarimetry of are emissions in this energy range are needed to study particle acceleration and transport questions. The GRIPS instrument is specifically designed to answer questions including: What causes the spatial separation between energetic electrons producing hard X-rays and energetic ions producing gamma-ray lines? How anisotropic are the relativistic electrons, and why can they dominate in the corona? How do the compositions of accelerated and ambient material vary with space and time, and why? GRIPS's key technological improvements over the current solar state of the art at HXR/gamma-ray energies, the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI), include 3D position-sensitive germanium detectors (3D-GeDs) and a single-grid modulation collimator, the multi-pitch rotating modulator (MPRM). The 3D-GeDs have spectral FWHM resolution of a few hundred keV and spatial resolution <1 mm³. For photons that Compton scatter, usually ⪆150 keV, the energy deposition sites can be tracked, providing polarization measurements as well as enhanced background reduction through Compton imaging. Each of GRIPS's detectors has 298 electrode strips read out with ASIC/FPGA electronics. In GRIPS's energy range, indirect imaging methods provide higher resolution than focusing optics or Compton imaging techniques. The MPRM gridimaging system has a single-grid design which provides twice the throughput of a bi-grid imaging system like RHESSI. The grid is composed of 2.5 cm deep tungsten-copper slats, and quasi-continuous FWHM angular coverage from 12.5-162 arcsecs are achieved by varying the slit pitch between 1-13 mm. This angular resolution is capable of imaging the separate magnetic loop footpoint emissions in a variety of are sizes. In comparison, RHESSI's 35-arcsec resolution at similar energies makes the footpoints resolvable in only the largest ares.

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Proceedings Article | 23 July 2014 Paper

Caliste-SO: the x-ray spectrometer unit of the STIX instrument onboard the Solar Orbiter space mission

Aline Meuris, Olivier Limousin, Olivier Gevin, Marie-Cécile Vassal, Fabrice Soufflet, Nicolas Fiant, Martin Bednarzik, Christopher Wild, Stefan Stutz, Guy Birrer, Claire Blondel, Isabelle Le Mer, Duc-Dat Huynh, Modeste Donati, Oliver Grimm, Volker Commichau, Gordon Hurford, Säm Krucker, François Gonzalez, Marc Billot

Proceedings Volume 9154, 91540Y (2014) https://doi.org/10.1117/12.2055171

KEYWORDS: Sensors, Spectroscopy, Photons, Collimators, Image resolution, Electronics, Analog electronics, X-rays, Interfaces, Signal detection

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Proceedings Article | 25 October 2013 Paper

Hardware simulator of Caliste-SO detectors for STIX instrument

P. Podgórski, D. Ścisłowski, M. Kowaliński, T. Mrozek, M. Stęślicki, J. Barylak, A. Barylak, J. Sylwester, S. Krucker, G. Hurford, N. Arnold, P. Orleański, A. Meuris, O. Limousin, O. Gevin, O. Grimm, L. Etesi, N. Hochmuth, M. Battaglia, A. Csillaghy, I. Kienreich, A. Veronig, S. Bloomfield, M. Byrne, A. Massone, M. Piana, S. Giordano, K. Skup, R. Graczyk, M. Michalska, W. Nowosielski, A. Cichocki, M. Mosdorf

Proceedings Volume 8903, 89031V (2013) https://doi.org/10.1117/12.2035285

KEYWORDS: Sensors, Device simulation, Photons, Field programmable gate arrays, Signal detection, Solar processes, X-rays, Temperature sensors, Data modeling, Data storage

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Proceedings Article | 26 September 2013 Paper

Detector and imaging systems for the gamma-ray imager/polarimeter for solar flares (GRIPS) instrument

Nicole Duncan, Albert Shih, Gordon Hurford, Pascal Saint-Hilaire, Andreas Zoglauer, Hazel Bain, Mark Amman, Steven Boggs, Robert Lin

Proceedings Volume 8862, 88620W (2013) https://doi.org/10.1117/12.2024667

KEYWORDS: Sensors, Imaging systems, Solar energy, Imaging spectroscopy, Image sensors, Electronics, Cameras, Gamma radiation, Field programmable gate arrays, Sun

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Proceedings Article | 7 November 2012 Paper

Instrument data processing unit for spectrometer/telescope for imaging x-rays (STIX)

Konrad Skup, A. Cichocki, R. Graczyk, M. Michalska, M. Mosdorf, W. Nowosielski, P. Orleański, A. Przepiórka, K. Seweryn, M. Stolarski, M. Winkler, J. Sylwester, M. Kowalinski, T. Mrozek, P. Podgorski, A. Benz, S. Krucker, G. Hurford, N. Arnold, H. Önel, A. Meuris, O. Limousin, O. Grimm

Proceedings Volume 8454, 84540K (2012) https://doi.org/10.1117/12.2000714

KEYWORDS: Sensors, X-rays, Space operations, Attenuators, Imaging systems, X-ray imaging, Field programmable gate arrays, Control systems, Data processing, Electronics

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Proceedings Article | 21 September 2012 Paper

SOLAR-T: terahertz photometers to observe solar flare emission on stratospheric balloon flights

P. Kaufmann, A. Abrantes, E. C. Bortolucci, E. Correia, J. A. Diniz, G. Fernandez, L. O. T. Fernandes, C. G. Giménez de Castro, R. Godoy, G. Hurford, A. S. Kudaka, M. Lebedev, R. Lin, N. Machado, V. S. Makhmutov, R. Marcon, A. Marun, V. Nicolaev, P. Pereyra, J.-P. Raulin, C. M. da Silva, A. Shih, Y. Stozhkov, J. Swart, A. Timofeevsky, A. Valio, T. Villela, M. B. Zakia

Proceedings Volume 8442, 84424L (2012) https://doi.org/10.1117/12.926072

KEYWORDS: Terahertz radiation, Photometry, Telescopes, Data acquisition, Surface plasmons, Sensors, Iridium, Solar processes, Mirrors, Linear filtering

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Proceedings Article | 17 September 2012 Paper

The Gamma-Ray Imager/Polarimeter for Solar flares (GRIPS)

Albert Shih, Robert Lin, Gordon Hurford, Nicole Duncan, Pascal Saint-Hilaire, Hazel Bain, Steven Boggs, Andreas Zoglauer, David Smith, Hiroyasu Tajima, Mark Amman, Tadayuki Takahashi

Proceedings Volume 8443, 84434H (2012) https://doi.org/10.1117/12.926450

KEYWORDS: Sensors, Gamma radiation, Electrons, Spatial resolution, Solar processes, Polarization, Imaging systems, Imaging spectroscopy, Spectroscopy, Ions

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Proceedings Article | 17 September 2012 Paper

The spectrometer telescope for imaging x-rays on board the Solar Orbiter mission

A. Benz, S. Krucker, G. Hurford, N. Arnold, P. Orleanski, H.-P. Gröbelbauer, S. Klober, L. Iseli, H. Wiehl, A. Csillaghy, L. Etesi, N. Hochmuth, M. Battaglia, M. Bednarzik, R. Resanovic, O. Grimm, G. Viertel, V. Commichau, A. Meuris, O. Limousin, S. Brun, N. Vilmer, K. Skup, R. Graczyk, M. Stolarski, M. Michalska, W. Nowosielski, A. Cichocki, M. Mosdorf, K. Seweryn, A. Przepiórka, J. Sylwester, M. Kowalinski, T. Mrozek, P. Podgorski, G. Mann, H. Aurass, E. Popow, H. Önel, F. Dionies, S. Bauer, J. Rendtel, A. Warmuth, M. Woche, D. Plüschke, W. Bittner, J. Paschke, D. Wolker, H. Van Beek, F. Farnik, J. Kasparova, A. Veronig, I. Kienreich, P. Gallagher, D. Bloomfield, M. Piana, A. Massone, B. Dennis, R. Schwarz, R. Lin

Proceedings Volume 8443, 84433L (2012) https://doi.org/10.1117/12.927793

KEYWORDS: Sensors, X-rays, Imaging systems, Solar energy, Hard x-rays, X-ray imaging, X-ray telescopes, Electrons, Electronics, Space telescopes

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Proceedings Article | 4 February 2004 Paper

The Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) mission

Robert Lin, Brian Dennis, Gordon Hurford, David Smith, Alex Zehnder

Proceedings Volume 5171, (2004) https://doi.org/10.1117/12.506649

KEYWORDS: Electrons, Solar energy, Gamma radiation, Imaging spectroscopy, Hard x-rays, Solar processes, X-rays, Ions, Sun, Curium

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Proceedings Article | 11 March 2003 Paper

Nonsolar astronomy with the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI)

David Smith, Robert Lin, Kevin Hurley, Wayne Coburn, Gordon Hurford, Claudia Wigger, W. Hajdas, Alex Zehnder, Mark McConnell

Proceedings Volume 4851, (2003) https://doi.org/10.1117/12.461415

KEYWORDS: Sensors, Solar energy, Photons, Imaging systems, Gamma radiation, Spectroscopy, Space operations, Modulation, Imaging spectroscopy, Magnetism

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Proceedings Article | 11 February 2003 Paper

RHESSI imager and aspect systems

Alex Zehnder, Jacek Bialkowski, F. Burri, Martin Fivian, Reinhold Henneck, A. Mchedlishvili, P. Ming, J. Welte, Knud Thomsen, David Clark, Brian Dennis, Gordon Hurford, David Curtis, Peter Harvey, David Pankow

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460290

KEYWORDS: Charge-coupled devices, Imaging systems, Stars, Space operations, Sun, Electronics, Interference (communication), CCD image sensors, Lenses, Sensors

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Proceedings Article | 11 February 2003 Paper

Imaging with RHESSI

Gordon Hurford

Proceedings Volume 4853, (2003) https://doi.org/10.1117/12.460295

KEYWORDS: Modulation, Sensors, Solar energy, Collimators, Spatial resolution, Imaging systems, Imaging spectroscopy, X-rays, Image resolution, Space operations

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Proceedings Article | 13 December 2000 Paper

Cyclone Hard X-Ray Observatory

Steven Boggs, Robert Lin, Brian Dennis, Norman Madden, Peter von Ballmoos, Knud Thomsen, Gordon Hurford, Kevin Hurley, David Smith, Pierre Jean, Juergen Knoedlseder, Robyn Millan

Proceedings Volume 4140, (2000) https://doi.org/10.1117/12.409159

KEYWORDS: Modulation, Sensors, Hard x-rays, Spectral resolution, Spatial resolution, Space operations, Observatories, Electronics, Imaging spectroscopy, Satellites

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Proceedings Article | 18 July 2000 Paper

Calibrating the aspect systems of the high-energy solar spectroscopic imager (HESSI)

Martin Fivian, Jacek Bialkowski, W. Hajdas, Reinhold Henneck, A. Mchedlishvili, P. Ming, Knud Thomsen, Alex Zehnder, Gordon Hurford, David Curtis, David Pankow, Brian Dennis

Proceedings Volume 4012, (2000) https://doi.org/10.1117/12.391587

KEYWORDS: Charge-coupled devices, Stars, Sun, Imaging systems, Calibration, Solar energy, Space operations, CCD image sensors, Spatial resolution, Imaging spectroscopy

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Proceedings Article | 22 October 1999 Paper

Roll Angle System (RAS) for the High-Energy Solar Spectroscopic Imager HESSI

Reinhold Henneck, Jacek Bialkowski, F. Burri, Martin Fivian, W. Hajdas, A. Mchedlishvili, P. Ming, Knud Thomsen, J. Welte, Alex Zehnder, M. Dettwyler, F. Buerki, Gordon Hurford, David Curtis, David Pankow

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366530

KEYWORDS: Stars, Charge-coupled devices, Sun, Imaging systems, Satellites, Reflectivity, Imaging spectroscopy, Spectroscopy, Space operations, Scanners

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Proceedings Article | 22 October 1999 Paper

Solar Aspect System (SAS) for the High-Energy Solar Spectroscopic Imager (HESSI)

Reinhold Henneck, Jacek Bialkowski, F. Burri, Martin Fivian, W. Hajdas, A. Mchedlishvili, P. Ming, Knud Thomsen, J. Welte, Alex Zehnder, Brian Dennis, Gordon Hurford, David Curtis, David Pankow

Proceedings Volume 3765, (1999) https://doi.org/10.1117/12.366560

KEYWORDS: Charge-coupled devices, Sun, Imaging systems, Space operations, Solar energy, Fermium, Frequency modulation, Data processing, Light emitting diodes, Imaging spectroscopy

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Proceedings Article | 2 November 1998 Paper

High-Energy Solar Spectroscopic Imager (HESSI) Small Explorer mission for the next (2000) solar maximum

Robert Lin, Gordon Hurford, Norman Madden, Brian Dennis, Carol Crannell, Gordon Holman, Reuven Ramaty, Tycho von Rosenvinge, Alex Zehnder, H. Frank van Beek, Patricia Bornmann, Richard Canfield, A. Gordon Emslie, Hugh Hudson, Arnold Benz, John Brown, Shinzo Enome, Takeo Kosugi, Nicole Vilmer, David Smith, Jim McTiernan, Isabel Hawkins, Said Slassi-Sennou, Andre Csillaghy, George Fisher, Chris Johns-Krull, Richard Schwartz, Larry Orwig, Dominic Zarro, Ed Schmahl, Markus Aschwanden, Peter Harvey, David Curtis, David Pankow, David Clark, Robert Boyle, Reinhold Henneck, Akilo Michedlishvili, Knud Thomsen, Jeff Preble, Frank Snow

Proceedings Volume 3442, (1998) https://doi.org/10.1117/12.330245

KEYWORDS: Electrons, Imaging spectroscopy, Solar energy, X-rays, Spatial resolution, Space operations, Sensors, Hard x-rays, Ions, Sun

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Proceedings Article | 31 July 1998 Paper

Broadband microwave imaging spectroscopy with a solar-dedicated array

Tim Bastian, Dale Gary, S. White, Gordon Hurford

Proceedings Volume 3357, (1998) https://doi.org/10.1117/12.317414

KEYWORDS: Antennas, Magnetism, Sun, Imaging spectroscopy, Calibration, Spatial resolution, Solar processes, Spectroscopes, Diagnostics, Electrons

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Proceedings Article | 25 November 1996 Paper

High-Energy Solar Spectroscopic Imager (HESSI)

Brian Dennis, Robert Lin, Richard Canfield, Carol Crannell, A. Gordon Emslie, Gordon Holman, Hugh Hudson, Gordon Hurford, James Ling, Norman Madden, Reuven Ramaty

Proceedings Volume 2804, (1996) https://doi.org/10.1117/12.259716

KEYWORDS: Sensors, Imaging spectroscopy, Gamma radiation, Hard x-rays, Germanium, Solar energy, Ions, Electrons, X-rays, Spectroscopy

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