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Contribution à l'étalonnage en énergie du calorimètre du GLAST-LAT et qualification des modèles de cascades hadroniques disponibles sous GEANT4.

Abstract : GLAST is the new generation of Gamma-ray space telescope and should dramatically improve our knowledge of the Gamma-ray sky when it is launched in September 7th 2007.
Data from the beam test that was held at GANIL with low energy ions were analyzed in order to measure the light quenching factor of CsI for all kinds of ions from proton to krypton of energy between 0 and 73MeV per nucleon. These results have been very useful to understand the light quenching for relativistic ions that was measured during the GSI beam test. The knowledge of light quenching in GLAST CsI detectors for high energy ions is required for the on-orbit calibration with cosmic rays to succeed.
Hadronic background rejection is another major issue for GLAST, thus, all the algorithms rely on the GLAST official Monte-Carlo simulation, GlastRelease. Hadronic cascade data from the GSI beam test and from another beam test held at CERN on the SPS have been used to benchmark hadronic cascade simulation within the framework of GEANT4, on which GlastRelease is based.
Testing the good reproduction of simple parameters in GLAST-like calorimeters for hadronic cascades generated by 1.7GeV, 3.4GeV, 10GeV and 20GeV protons or pions led us to the conclusion that at high energy the default LHEP model is good enough, whereas at low energy the Bertini intra-nuclear cascade model should be used.
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https://tel.archives-ouvertes.fr/tel-00011356
Contributor : Johan Bregeon <>
Submitted on : Wednesday, January 11, 2006 - 6:42:27 PM
Last modification on : Monday, December 7, 2020 - 11:00:02 PM
Long-term archiving on: : Saturday, April 3, 2010 - 9:13:03 PM

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  • HAL Id : tel-00011356, version 1

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Johan Bregeon. Contribution à l'étalonnage en énergie du calorimètre du GLAST-LAT et qualification des modèles de cascades hadroniques disponibles sous GEANT4.. Astrophysique [astro-ph]. Université Sciences et Technologies - Bordeaux I, 2005. Français. ⟨tel-00011356⟩

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