Prof. Pierre Kaufmann Profile

Prof. Pierre Kaufmann

Full Professor at Univ Presbiteriana Mackenzie

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Publications (5)

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 | 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 | 15 July 2010 Paper

Selective spectral detection of continuum terahertz radiation

P. Kaufmann, R. Marcon, A. Marun, A. Kudaka, E. Bortolucci, M. Zakia, J. Diniz, M. Cassiano, P. Pereyra, R. Godoy, A. Timofeevsky, V. Nikolaev, A. Pereira Alves da Silva, L. Fernandes

Proceedings Volume 7741, 774125 (2010) https://doi.org/10.1117/12.856930

KEYWORDS: Terahertz radiation, Linear filtering, Sensors, Visible radiation, Cameras, Bandpass filters, Black bodies, Solar radiation, Microbolometers, Near infrared

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Proceedings Article | 10 July 2008 Paper

New telescopes for ground-based solar observations at submillimeter and mid-infrared

Pierre Kaufmann, Hugo Levato, Marta Cassiano, Emilia Correia, Joaquim E. Costa, C. Guillermo Giménez de Castro, Rodolfo Godoy, Robert Kingsley, Jeffrey Kingsley, Amauri Kudaka, Rogério Marcon, Robert Martin, Adolfo Marun, Arline Melo, Pablo Pereyra, Jean-Pierre Raulin, Thomas Rose, Adriana Silva Valio, Achim Walber, Patrick Wallace, Azriel Yakubovich, Maria Beny Zakia

Proceedings Volume 7012, 70120L (2008) https://doi.org/10.1117/12.788889

KEYWORDS: Mid-IR, Telescopes, Radiometry, Terahertz radiation, Electroluminescence, Antennas, Solar processes, Surface plasmons, Mirrors, Cameras

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Proceedings Article | 15 March 2002 Paper

Concept of partially overlapping multiple beams for spatial determination of solar bursts time transients at submm-IR wavelengths

Pierre Kaufmann, Arline Melo, C. Guillermo Gimenez de Castro

Proceedings Volume 4710, (2002) https://doi.org/10.1117/12.459629

KEYWORDS: Reflectors, Staring arrays, Antennas, Bolometers, Surface plasmons, Telescopes, Radio telescopes, Electroluminescence, Radiometry, Solar processes

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