space applications of ge ant4 polarized processes
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Space Applications of GeSpace Applications of Geant4 ant4 Polarized ProcessesPolarized Processes
F.Longo+
G.Depaola*
+ University of Ferrara and INFN (Italia)
* National University of Córdoba (Argentina)
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OutlineOutline
Astrophysics with Polarized PhotonsDetectors in the Compton regimeSimulation RequirementsGeant4 processesARGO: Compton or Pair telescope?
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Polarized Gamma AstrophyicsPolarized 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)
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Detectors in the Compton RegimeDetectors in the Compton Regime
Principles of operation Polarization measurements
in the Compton regime
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Polarization DetectionPolarization Detection
•Modulation Factor (azimuthal distribution of scattered photons )
• Figure of merit of Polarimeter
• Minimum Detectable Polarization
See McConnell (ACT Workshop 2001)
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COMPTELCOMPTEL
• Simulation in Geant3 - without the Spacecraft - EM only
• Background simulation• Poor geometry small modulation factor
See McConnell - Kippen (ACT Workshop 2001)
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INTEGRALINTEGRAL
Photo ESA
See McConnell (ACT Workshop 2001)
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GeometryGeometry
See McConnell (ACT Workshop 2001)
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MEGAMEGA
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Advanced Compton TelescopeAdvanced Compton Telescope
0.8 m
1 m
1 m
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Advanced Compton TelescopeAdvanced Compton Telescope
See McConnell (ACT Workshop 2001)
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X-ray polarimetryX-ray polarimetrywith MicroPattern Gas Detectorswith MicroPattern Gas Detectors
Costa et al. 2001
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Simulation EffortSimulation Effort
•Improved EM Physics•Kinematic reconstruction of multiple Compton events•Electron and pair tracking•Background simulation efforts•Image deconvolution
See Kippen (ACT Workshop 2001)
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RequirementsRequirements
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)
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Geant4: the answer?Geant4: the answer?
Unified framework (science, background, instrumental effects)
Source & Background modellingDetector descriptionSpace modulesAnalysis tools
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ARGO ARGO (Argentine Gamma Observatory)(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