Maria Grazia Pia, INFN Genova 1 Part IV Geant4 results.
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Transcript of Maria Grazia Pia, INFN Genova 1 Part IV Geant4 results.
Maria Grazia Pia, INFN Genova 1
Part IV
Geant4 results
Maria Grazia Pia, INFN Genova 2
Overview of applications and results
Geant4 is used in a wide variety of experiments and fields
the future LHC experiments neutrino and astroparticle physics
experiments space science astrophysics X-ray analysis medical physics theoretical applications ...
Maria Grazia Pia, INFN Genova 3
Geometries
Maria Grazia Pia, INFN Genova 4
Cuts in range (G3/G4)
Maria Grazia Pia, INFN Genova 5
Visible energy in Si vs energy of the incident electron: G3, G4, data
Maria Grazia Pia, INFN Genova 6
Multiple scattering in thin layers
Maria Grazia Pia, INFN Genova 7
Backscattering
Maria Grazia Pia, INFN Genova 8
Low energy e.m. extensions
Maria Grazia Pia, INFN Genova 9
High energy muons
Maria Grazia Pia, INFN Genova 10
Geant4 hadronic physics
Maria Grazia Pia, INFN Genova 11
Hadronic models, parameterised
Maria Grazia Pia, INFN Genova 12
Photon evaporation
Maria Grazia Pia, INFN Genova 13
Stopping pions
Maria Grazia Pia, INFN Genova 14
Neutrons
Maria Grazia Pia, INFN Genova 15
Atlas geometry
Maria Grazia Pia, INFN Genova 16
CMS geometry and magnetic field
Maria Grazia Pia, INFN Genova 17
CMS e.m. calorimeter
Maria Grazia Pia, INFN Genova 18
BaBar Object-oriented Geant4-based Unified
Simulation (BOGUS) Integrated framework for Fast and Full simulation Fast simulation available for public use since Feb. 99
complete of fast reconstruction (downstream modules) validation completed (B0 -> K+ pi-, B0 -> D*- l+ nu,
B0 -> J/Psi K0S, …) Current version based on Geant4.0.1 (+additional
development patches) Integrated in BaBar environment
primary generators, reconstruction, OODB persistency (materials & geometry description parameters, events)
parameters for materials and geometry shared with reconstruction applications
BaBar Geant4-based Simulation
Maria Grazia Pia, INFN Genova 19
SVTSilicon Vertex Tracker
EMCElectro Magnetic Calorimeter
Examples of BaBar Geant4 geometries
Maria Grazia Pia, INFN Genova 20
Borexino
Geant4 components used to track photons
geometry physics processes pertinent to optical
photons (reflection, rifraction, absorption etc.)
visualisation
They have developed absorption and reemission processes typical of Borexino scintillator
Maria Grazia Pia, INFN Genova 21
Borexino
Maria Grazia Pia, INFN Genova 22
Medical physics applications
A very active field!
Studies for brachytherapy (IST Genova)
Interface to CT for treatment planning (Novara)
Feasibility studies for new hadrotherapy facilities (TERA)
Magic Cube (INFN Torino) etc...
Technology transfer from HEP to other fields
Maria Grazia Pia, INFN Genova 23
Low Energy processes for medical applications
Maria Grazia Pia, INFN Genova 24
Bragg peak
Maria Grazia Pia, INFN Genova 25
Space applications
Maria Grazia Pia, INFN Genova 26
Theoretical physics applications
Geant4 is used also by theorists
Geant4 theoretical models for hadronic physics to be used by theorists for further theoretical developments and studies (Quantum Molecular Dynamics, Heavy Ions models etc.)
All this is made possible by the OO design of Geant4
modular, flexible, extensible
the physics is clearly exposed
Maria Grazia Pia, INFN Genova 27
Performance
Geant4 - Geant3.21 comparisons Realistic detector configurations All results and plots available at http://wwwinfo.cern.ch/asd/geant/geant4_public/
gallery/EMbenchmarks
Benchmark in liquid Argon + Pb calorimeter At a comparable physics performance Geant4 is faster
than Geant3.21 by a factor >3 using exactly the same cuts by a factor >10 when Geant4 cuts are optimized,
keeping the same physics performance At comparable speed, Geant4 physics perfomance is far
superior to Geant3.21 one
Benchmark in thin silicon layer Single volume, single material At a comparable physics performance Geant4 is 25%
faster than Geant3.21
Many factors contribute to these results: design, more powerful geometry navigation and tracking algorithms, improved physics algorithms etc.
Note: Geant3.21 run in its best optimized configuration for these tests
Maria Grazia Pia, INFN Genova 28
An ambitious project
What if the geometry to describe with Geant4 were DNA and the process were mutagenesis?
Study of radiation damage at the cellular and DNA level in the space radiation environment
ESA-sponsored project, in collaboration with INFN INFN (Genova, Torino, Cosenza) Istituto Nazionale per la Ricerca sul Cancro Università del Piemonte Orientale (Novara) ESA CERN
Multi-disciplinary Collaboration of astrophysicists and space scientists particle physicists medical physicists biologists physicians
First phase of the project: User Requirements
Maria Grazia Pia, INFN Genova 29
Conclusions
Geant4 is used in a variety of applications HEP and nuclear physics experiments astrophysics and astro-particle physics space science studies medical physics etc.
Several experiments are already in an advanced stage of their Geant4-based applications
complex geometry descriptions comparisons with experimental data production mode
Various new tools offered by Geant4 respond to essential needs of some user communities
CAD interface extensions of the physics processes covered new physics standard-compliant tools etc.