Jornadas LIP 2003, Lisboa, 20-21 de Dezembro Jornadas LIP 2003, Lisboa, 20-21 de Dezembro Aplicações de Geant4 Aplicações de Geant4 em experiências de Astropartículas em experiências de Astropartículas M.C. Espírito-Santo, P. Gonçalves, M. Pimenta, P. Rodrigues, M.C. Espírito-Santo, P. Gonçalves, M. Pimenta, P. Rodrigues, B. B. Tomé Tomé , A. Trindade , A. Trindade
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Jornadas LIP 2003, Lisboa, 20-21 de Dezembro Aplicações de Geant4 em experiências de Astropartículas M.C. Espírito-Santo, P. Gonçalves, M. Pimenta, P.
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Jornadas LIP 2003, Lisboa, 20-21 de DezembroJornadas LIP 2003, Lisboa, 20-21 de Dezembro
Aplicações de Geant4 Aplicações de Geant4 em experiências de Astropartículasem experiências de Astropartículas
M.C. Espírito-Santo, P. Gonçalves, M. Pimenta, P. Rodrigues, M.C. Espírito-Santo, P. Gonçalves, M. Pimenta, P. Rodrigues, B. ToméB. Tomé, A. Trindade, A. Trindade
The main objectives of the LIP-ESA contract “Radiation Interaction Simulations for High-Energy Astrophysics Experiments EUSO and AMS”1 are:
to allow/promote the participation of Portuguese groups in the Geant4 activities related to space applications.
to develop a software framework for application of Geant4 in the first instance to astroparticle experiments (EUSO and AMS) on the ISS.
to perform detailed inter-comparison with results from Monte Carlo and analytical codes and experimental data.
Introduction
The team joins collaborators from AMS, EUSO and Medical Physics LIP groups
• Mid-term review meeting at LIP premises (held on October 15th)
• Final presentation (to be held at ESTEC)
• Article for publication in ESA´s bulletin
• WWW site for the project IEEE Nuclear Science Symposium/Medical Imaging Conference, 19-25 October, 2003, Portland, Oregon, USA"
Simulation Requirements
Simulation of AMS/RICH and EUSO/ULTRA sub-detector geometries
Interface with different primary event generators
• Cosmic-ray flux in high-altitude orbit • Atmospheric cosmic-ray flux at ground-level• Accelerator beam phase-space data
Simulation of readout electronics, signal digitisation and event reconstruction
OO technology for event data persistency and data analysis
Simulation Organization
Analysis: ROOT
Radiation Transport: GEANT4
Signal Digitization: DIGITsim
Event Storage: ROOT I/O
Code Management System:
CVS System
GEANT4GEANT4 DIGITsimDIGITsim
ROOT AnalysisROOT Analysis
ROOT I/OROOT I/O
CVS Code ManagementCVS Code Management
Framework Highlights
Ability to accommodate different geometry organizations
General Particle Source (GPS) developed by ESA for primary particle sampling (ISS orbit or Earth surface)
Physics Lists: Electromagnetic Standard Physics (for leptons and hadrons) Low Energy Electromagnetic Physics for sensitive detectors Optical transport of scintillation and Cherenkov light, Rayleigh dispersion, bulk
attenuation (plus WLS process for GEANT4.6.0 release) UNIFIED optical boundary model No hadronic modes for now (physics lists for air showers are under test by beta-
testers)
AMS/RICH and EUSO/ULTRA
related applications
Simulation of an ULTRA station
Internal walls are coated with white diffusing paint
Simulation of the ULTRA UV telescope (II) (Fresnel lens implementation in the simulation framework)
(work in progress...)
AMS/RICH radiator simulation
AMS/RICH aerogel studies
Improve description/understanding of light scattering in aerogel
Introduce realistic modelling of aerogel surface
Mapping of aerogel surface using Atomic Force Microscope (ongoing measurements)
Upgrade related classes of Geant4.
Sumário
As actividades realizadas no âmbito do contracto LIP-ESA permitiram alargar competências já existentes no LIP no grupo de Física Médica aos grupos envolvidos em experiências de Astropartículas.
Foram identificadas áreas de intervenção para o desenvolvimento do código de Geant4.
A colaboração Geant4 manifestou já interesse em aplicações desenvolvidas utilizando o “framework” descrito.