Louvain-la-Neuve, Belgium
Louvain-la-Neuve, Belgium

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Cyamukungu M.,Center for Space Radiations | Benck S.,Center for Space Radiations | Cabrera J.,Center for Space Radiations | Gregoire G.,Center for Space Radiations | And 16 more authors.
Proceedings of the European Conference on Radiation and its Effects on Components and Systems, RADECS | Year: 2011

Models of energetic electrons and protons at low altitudes in space display significant discrepancies. In this paper the possible causes of the observed differences between the most frequently used models are discussed, including instrument-induced data inaccuracy. In parallel, on the basis of simulations and in-beam experimental results, solutions to the instrumentation issues are described focusing on the implementation of these into the Energetic Particle Telescope. © 2011 IEEE.

Cyamukungu M.,Catholic University of Louvain | Benck S.,Catholic University of Louvain | Borisov S.,Catholic University of Louvain | Gregoire G.,Catholic University of Louvain | And 32 more authors.
IEEE Transactions on Nuclear Science | Year: 2014

This paper provides a detailed description of the Energetic Particle Telescope (EPT) accommodated on board the PROBA-V satellite launched on May 7th, 2013 on a LEO, 820 km altitude, 98.7 inclination and a 10:30-11:30 Local Time at Descending Node. The EPT is an ionizing particle spectrometer that was designed based on a new concept and the most advanced signal processing technologies: it performs in-flight electron and ion discrimination and classifies each detected particle in its corresponding physical channels from which the incident spectrum can be readily reconstructed. The detector measures electron fluxes in the energy range 0.5-20 MeV, proton fluxes in the energy range 9.5-300 MeV and He-ion fluxes between 38 and 1200 MeV. The EPT is a modular configurable instrument with customizable maximum energy, field of view angle, geometrical factor and angular resolution. Therefore, the features of the currently flying instrument may slightly differ from those described in past or future configurations. After a description of the instrument along with the data acquisition and analysis procedures, the first particle fluxes measured by the EPT will be shown and discussed. The web-site located at http://web.csr.ucl.ac.be/csr-web/probav/which daily displays measured fluxes and other related studies will also be briefly described. © 1963-2012 IEEE.

Benck S.,Center for Space Radiations | Mazzino L.,University of Alberta | Cyamukungu M.,Center for Space Radiations | Cabrera J.,Center for Space Radiations | And 2 more authors.
Annales Geophysicae | Year: 2010

When flux enhancements of energetic electrons are produced as a consequence of geomagnetic storm occurrence, they tend to vanish gradually when the magnetic activity calms down and the fluxes decay to quiet-time levels. We use SAC-C and DEMETER low altitude observations to estimate the energetic electron lifetimes (E=0.16-1.4 MeV, L=1.6-5, B=0.22-0.46 G) and compare the decay rates to those observed at high altitude. While crossing the radiation belts at high latitude, the SAC-C and DEMETER instruments sample particles with small equatorial pitch angles (αeq<18° for L>2.5) whereas the comparison is done with other satellite data measured mainly in the equatorial plane (for αeq>75°). While in the inner belt and in the slot region no significant lifetime differences are observed from the data sets with different αeq, in the outer belt, for the least energetic electrons (<500 keV), the lifetimes are up to ∼3 times larger for the electrons with the equatorial pitch-angle close to the loss cone than for those mirroring near the equator. The difference decreases with increasing energy and vanishes for energies of about 1 MeV.

Desoete B.,QinetiQ | Semaille C.,QinetiQ | Claessens D.,QinetiQ | Cyamukungu M.,Center for Space Radiations | Nieminen P.,European Space Agency
Proceedings of the International Astronautical Congress, IAC | Year: 2012

The Energetic Particle Telescope (EPT) instrument is a highly innovative science class radiation spectrometer designed to detect, directly identify and measure the energy of electrons, protons, alpha-particles and heavier ions in the space environment. The EPT particle discrimination concept allows full discrimination at high energy without using a huge amount of sensor material. As such, EPT is a solution to inaccuracies in radiation flux data, which affects the quality of engineering space radiation models. Also, the EPT can provide real-time (ready for use) flux measurements needed for detailed space weather forecasting. The EPT concept has been developed by the Centre for Space Radiations (CSR) in Belgium, while the EPT instrument is being developed under ESA contract by a consortium led by QinetiQ Space, also in Belgium. This paper contains a description of the EPT particle detection concept, a description of its design and performance, and a brief outline of the EPT program.

Cyamukungu M.,Center for Space Radiations | Gregoire G.,Center for Space Radiations
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The forecast of energetic particle fluxes on time scales of hours to weeks, at a given position in space, can be achieved on the basis of experimentally determined particle lifetimes and on real-time measurements of contamination-free spectra. Such elaborated measurements can be provided by the Energetic Particle Telescope (EPT) without any further post-processing. This instrument directly acquires energy spectra of electrons (0.2 - 10 MeV), protons (4 - 300 MeV), α- particles (16 - 1000 MeV) and heavier ions (up to 300 MeV/nucleon). The EPT was developed at the Center for Space Radiations - UCL-Belgium. This paper contains a brief description of the EPT concept and the definition of channels along with a more detailed presentation of the general performances based on the intrinsic detection efficiency functions and the validation test results from an Engineering Model. The EPT capabilities for space-weather related applications are highlighted by an example of forecast of an electron flux. © 2011 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).

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