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Space Applications of Ge ant4 Polarized Processes

Space Applications of Ge ant4 Polarized Processes. F.Longo + G.Depaola *. + University of Ferrara and INFN (Italia) * National University of Córdoba (Argentina). Outline. Astrophysics with Polariz ed Photons Detectors in the Compton regime Simulation Requirements Geant4 processes

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Space Applications of Ge ant4 Polarized Processes

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  1. Space Applications of Geant4 Polarized Processes F.Longo+ G.Depaola* + University of Ferrara and INFN (Italia) * National University of Córdoba (Argentina)

  2. Outline • Astrophysics with Polarized Photons • Detectors in the Compton regime • Simulation Requirements • Geant4 processes • ARGO: Compton or Pair telescope?

  3. Polarized Gamma Astrophyics • Compton Astrophyics (MeV region) • Emission Mechanisms (Synchrotron Radiation, Bremsstrahlung, Compton Scattering, Photon Splitting) • Astronomical Sites (Solar Flares , Galactic BH candidates, Pulsars, Plerions, AGN, GRB) See Review by Lei, Dean & Hills (1997)

  4. Detectors in the Compton Regime • Principles of operation • Polarization measurements in the Compton regime

  5. Polarization Detection • Modulation Factor • (azimuthal distribution of • scattered photons ) • Figure of merit of Polarimeter • Minimum Detectable Polarization See McConnell (ACT Workshop 2001)

  6. COMPTEL • Simulation in Geant3 • - without the Spacecraft • - EM only • Background simulation • Poor geometry small modulation factor See McConnell - Kippen (ACT Workshop 2001)

  7. INTEGRAL Photo ESA See McConnell (ACT Workshop 2001)

  8. Geometry See McConnell (ACT Workshop 2001)

  9. MEGA

  10. Advanced Compton Telescope

  11. Advanced Compton Telescope See McConnell (ACT Workshop 2001)

  12. X-ray polarimetrywith MicroPattern Gas Detectors Costa et al. 2001

  13. Simulation Effort • Improved EM Physics • Kinematic reconstruction of multiple Compton events • Electron and pair tracking • Background simulation efforts • Image deconvolution See Kippen (ACT Workshop 2001)

  14. Requirements • Physical Simulation • EM physics 1keV – 50 MeV • Better description of Compton (doppler broadening and polarization) • Hadronic cascades, spallation, isotope production, radioactive decay • Time dependency • Models of background • Instrumental effects • Reconstruction efforts See Kippen (ACT Workshop 2001)

  15. Geant4: the answer? • Unified framework (science, background, instrumental effects) • Source & Background modelling • Detector description • Space modules • Analysis tools

  16. ARGO (Argentine Gamma Observatory) • 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 • G4 crucial to evaluate the sensibility from Gamma Conversion or Compton Scattering

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