Gamma Ray Satellites Simulations with Geant 4 A

Gamma Ray Satellites Simulations with Geant 4 A. De. Angelis 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 (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

Outline l Gamma Ray Satellites Science and Requirements – AGILE – GLAST – ARGO l Gamma. Ray. Tel Advanced example (a real training tool) – – l Geometry and Physics Visualisation Histogramming User Interface Satellites Simulation – XML detector description – Physics Processes Extensions & Validation Geant 4 Workshop – Genova 05 july 2001

High Energy Gamma Ray Astrophysics Geant 4 Workshop – Genova 05 july 2001

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

Multiwavelenght Observations GRB puzzle AGN wide band spectrum Geant 4 Workshop – Genova 05 july 2001

AGILE l l l l Pair Conversion Telescope Coded Mask Imaging System 10 – 40 ke. V 30 Me. V – 50 Ge. V Very wide Field of View Reaction to transients ASI first Small Scientific Mission (2003 – 2006) Geant 4 Workshop – Genova 05 july 2001

ARGO l. Proposal to Argentina National Agency for Scientific and Technological Development l. Payload l. Power l. Use weight (40 -60 kg ~ AGILE) 60 W of Silicon Detectors l. Measurements Gamma Rays of Polarization from Geant 4 Workshop – Genova 05 july 2001

GLAST l. Pair Conversion Telescope l. Gamma l 30 Ray Burst Monitor Me. V – 50 Ge. V l. Very wide Field of View l. Spectral Coverage GRB l. International Collaboration (USA, France, Sweden, Japan, England, Italy, Germany) l. Launch date 2006 Geant 4 Workshop – Genova 05 july 2001

Simulations for Space Detectors Geant 4 Workshop – Genova 05 july 2001

Geant 4 and Space Applications Source detection l Different energy bands l Several mechanisms l Different detectors l Design and optimisation of satellites Geant 4 Workshop – Genova 05 july 2001

Geant 4 and Space Applications Background Simulation l Different sources (radioactive decay, cosmic origin, detector noise, …) l Geant 4 Workshop – Genova 05 july 2001

Gamma. Ray. Tel example l Advanced examples in the Geant 4 toolkit (since release 3. 0) l Properties – Advanced features of Geant 4 toolkit – Features of the Low Energy Electromagnetic processes in Geant 4 – Reliability of Geant 4 in a space environment application Geant 4 Workshop – Genova 05 july 2001

Geometry and Physics for Gamma. Ray. Tel Lead converter Si detectors (400 m) Cs. I calorimeter Plastic anticoincidence Geant 4 Workshop – Genova 05 july 2001 Gamma Conversion Electron Tracking Multiple Scattering Delta-ray production Charged particle tracking

Visualisation, Histogramming, UI l Graphical drivers – Open. GL, VRML, DAWN l Histogramming using AIDA - Lizard – 1 d and 2 d histograms – Messenger to choose modality l UI – – Possibility to modify geometry and materials Source generation algoritmhs G 4 user interface capabilities Histograms operations Geant 4 Workshop – Genova 05 july 2001

XML and Detector Description GLAST collaboration has adopted the XML language for detector description l In house DTD (derived by ATLAS one, but with a lot of modifications) l In house C++ package to interface to the XML file l – Lot of clients for this package • • GEANT 4 VRML Event Display Others. . . Geant 4 Workshop – Genova 05 july 2001

XML Geant 4 Workshop – Genova 05 july 2001

G 4 Simulation Activities l Physics Validation & Extensions – Polarised Processes – Test Beam Comparisons l Integration – Migration from G 3 simulation (AGILE) – G 4 client for XML – GAUDI framework Geant 4 Workshop – Genova 05 july 2001

Conclusions l High Energy Astroparticle Physics – HEP and Astrophysics Communities Geant 4 Workshop – Genova 05 july 2001