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Geant4 application to X and Gamma-ray Telescopes

Geant4 application to X and Gamma-ray Telescopes. B.Ferrero Merlino 1 , D.Favretto 2 , R. Giannitrapani 2 , F.Longo 2 , R.Nartallo 3 , P.Nieminen 3 , A.Pfeiffer 1 , M.G.Pia 2 , G.Santin 2. (1) CERN (2) INFN (3) ESA/ESTEC. Outline. Geant4 and space applications for X and Gamma Astrophysics

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Geant4 application to X and Gamma-ray Telescopes

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  1. Geant4 application to X and Gamma-ray Telescopes B.Ferrero Merlino1, D.Favretto2, R. Giannitrapani2, F.Longo2, R.Nartallo3, P.Nieminen3, A.Pfeiffer1, M.G.Pia2, G.Santin2 (1) CERN (2) INFN (3) ESA/ESTEC

  2. Outline • Geant4 and space applications for X and Gamma Astrophysics • XRayTel and GammaRayTel examples • Geometry and Physics • Visualisation • Histogramming • User Interface • AGILE & GLAST, real experiments • XML detector description

  3. X and Gamma Astrophysics Gamma Ray Bursts: a puzzle being solved (since 1997)

  4. Gamma-ray Bursts (Credit NASA) (Credit BeppoSAX team) (Credit NASA/CNR/L.Piro et al.)

  5. Geant4 and Space Applications • Source detection • Different energy bands • Several mechanisms • Different detectors Design and optimisation of satellites

  6. Geant4 and Space Applications • Background Simulation • Different sources (radioactive decay, cosmic origin, detector noise, …)

  7. XRayTel and GammaRayTel examples • Advanced examples in the Geant4 toolkit (since release 3.0) • Properties • Advanced features of Geant4 toolkit • Features of the Low Energy Electromagnetic processes in Geant4 • Reliability of Geant4 in a space environment application

  8. Geometry and Physics for an X-ray Telescope Mirrors, Focal plane detectors Cosmic Ray generation & Focusing Coded mask imaging Photoelectric effect Credit: ESA Credit: NASA

  9. Geometry and Physics for a generic Gamma Telescope Tracker, Calorimeter, Anticoincidence Gamma Conversion Electron Tracking Multiple Scattering Delta-ray production Charged particle tracking

  10. Detectors geometry Lead converter Si detectors (400 m) CsI calorimeter Plastic anticoincidence Ni Conical mirrors (7.5 m) Gold coating Silicon Detectors (50 m)

  11. Visualization • Lot’s of graphical drivers • OpenGL • Not interactive, but fast • VRML • A standard for 3D scene description • Good interactivity (but can be slow) • PostScript (via DAWN) • Very high quality drawings (suitable for publications) • Can be very slow

  12. Histogramming and Analisys • Released version with Lizard using AIDA • 1d and 2d histograms • More than one histogram • Single or multiple views • Run-based or event-based • Messenger to choose modality

  13. Histogramming and Analysis

  14. User Interface • Possibility to modify geometry and materials • Source generation algoritmhs (Particle Module, Geant4 methods) • G4 user interface capabilities • Histograms operations

  15. AGILE & GLAST • Real Gamma Ray Experiments

  16. XML and Detector Description • GLAST collaboration has adopted the XML language for detector description • In house DTD (derived by ATLAS one, but with a lot of modifications) • In house C++ package to interface to the XML file • Lot of clients for this package • GEANT4 • VRML • Event Display • Others ...

  17. XML

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