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Gamma Ray Satellites Simulations with Geant4

Gamma Ray Satellites Simulations with Geant4. A. DeAngelis 1 , G.Barbiellini 2 , G.Depaola 3 , D.Favretto 1 , R. Giannitrapani 2 , F.Longo 4 , G.Santin 2 Thanks to B.Ferrero Merlino 5 , R.Nartallo 6 , P.Nieminen 6 , A.Pfeiffer 5 , M.G.Pia 7.

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Gamma Ray Satellites Simulations with Geant4

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  1. Gamma Ray Satellites Simulations with Geant4 A. DeAngelis1, G.Barbiellini2, G.Depaola3, D.Favretto1, R. Giannitrapani2, F.Longo4, G.Santin2 Thanks to B.Ferrero Merlino5, R.Nartallo6, P.Nieminen6, A.Pfeiffer5, M.G.Pia7 (1) University of Udine and INFN, Trieste (2) University and INFN Trieste (3) University Cordoba (Argentina) (4) University and INFN Ferrara (5) CERN (6) ESA/ESTEC (7) INFN, Genova

  2. Outline • Gamma Ray Satellites Science and Requirements • AGILE • GLAST • ARGO • GammaRayTel Advanced example (a real training tool) • Geometry and Physics • Visualisation • Histogramming • User Interface • Satellites Simulation • XML detector description • Physics Processes Extensions & Validation Geant4 Workshop – Genova 05 july 2001

  3. High Energy Gamma Ray Astrophysics Geant4 Workshop – Genova 05 july 2001

  4. High Energy Gamma Ray Astrophysics Active Galactic Nuclei Dark Matter Searches Gamma Ray Bursts Supernova Remnants Geant4 Workshop – Genova 05 july 2001 Pulsars

  5. Multiwavelenght Observations GRB puzzle AGN wide band spectrum Geant4 Workshop – Genova 05 july 2001

  6. AGILE • Pair Conversion Telescope • Coded Mask Imaging System • 10 – 40 keV • 30 MeV – 50 GeV • Very wide Field of View • Reaction to transients • ASI first Small Scientific Mission (2003 – 2006) Geant4 Workshop – Genova 05 july 2001

  7. ARGO • Proposal to Argentina National Agency for Scientific and Technological Development • Payload weight (40-60 kg ~ AGILE) • Power 60 W • Use of Silicon Detectors • Measurements of Polarization from Gamma Rays Geant4 Workshop – Genova 05 july 2001

  8. GLAST • Pair Conversion Telescope • Gamma Ray Burst Monitor • 30 MeV – 50 GeV • Very wide Field of View • Spectral Coverage GRB • International Collaboration (USA, France, Sweden, Japan, England, Italy, Germany) • Launch date 2006 Geant4 Workshop – Genova 05 july 2001

  9. Simulations for Space Detectors Geant4 Workshop – Genova 05 july 2001

  10. Geant4 and Space Applications • Source detection • Different energy bands • Several mechanisms • Different detectors Design and optimisation of satellites Geant4 Workshop – Genova 05 july 2001

  11. Geant4 and Space Applications • Background Simulation • Different sources (radioactive decay, cosmic origin, detector noise, …) Geant4 Workshop – Genova 05 july 2001

  12. GammaRayTel example • 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 Geant4 Workshop – Genova 05 july 2001

  13. Geometry and Physics for GammaRayTel Gamma Conversion Electron Tracking Multiple Scattering Delta-ray production Charged particle tracking Lead converter Si detectors (400 m) CsI calorimeter Plastic anticoincidence Geant4 Workshop – Genova 05 july 2001

  14. Visualisation, Histogramming, UI • Graphical drivers • OpenGL, VRML, DAWN • Histogramming using AIDA - Lizard • 1d and 2d histograms • Messenger to choose modality • UI • Possibility to modify geometry and materials • Source generation algoritmhs • G4 user interface capabilities • Histograms operations Geant4 Workshop – Genova 05 july 2001

  15. 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 ... Geant4 Workshop – Genova 05 july 2001

  16. XML Geant4 Workshop – Genova 05 july 2001

  17. G4 Simulation Activities • Physics Validation & Extensions • Polarised Processes • Test Beam Comparisons • Integration • Migration from G3 simulation (AGILE) • G4 client for XML • GAUDI framework Geant4 Workshop – Genova 05 july 2001

  18. Conclusions • High Energy Astroparticle Physics • HEP and Astrophysics Communities Geant4 Workshop – Genova 05 july 2001

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