1. Maria Grazia Pia, INFN Genova 1 Part IV Geant4 results

2. Maria Grazia Pia, INFN Genova 2 Overview of applications and results Geant4 is used in a wide variety of experiments and fields l the future LHC experiments l neutrino and astroparticle physics experiments l space science l astrophysics l X-ray analysis l medical physics l theoretical applications l...

3. Maria Grazia Pia, INFN Genova 3 Geometries

4. Maria Grazia Pia, INFN Genova 4 Cuts in range (G3/G4)

5. Maria Grazia Pia, INFN Genova 5 Visible energy in Si vs energy of the incident electron: G3, G4, data

6. Maria Grazia Pia, INFN Genova 6 Multiple scattering in thin layers

7. Maria Grazia Pia, INFN Genova 7 Backscattering

8. Maria Grazia Pia, INFN Genova 8 Low energy e.m. extensions

9. Maria Grazia Pia, INFN Genova 9 High energy muons

10. Maria Grazia Pia, INFN Genova 10 Geant4 hadronic physics

11. Maria Grazia Pia, INFN Genova 11 Hadronic models, parameterised

12. Maria Grazia Pia, INFN Genova 12 Photon evaporation

13. Maria Grazia Pia, INFN Genova 13 Stopping pions

14. Maria Grazia Pia, INFN Genova 14 Neutrons

15. Maria Grazia Pia, INFN Genova 15 Atlas geometry

16. Maria Grazia Pia, INFN Genova 16 CMS geometry and magnetic field

17. Maria Grazia Pia, INFN Genova 17 CMS e.m. calorimeter

18. Maria Grazia Pia, INFN Genova 18 B aBar O bject-oriented G eant4-based U nified S imulation (BOGUS) l Integrated framework for Fast and Full simulation l Fast simulation available for public use since Feb. 99 n complete of fast reconstruction (downstream modules) n validation completed (B0 -> K+ pi-, B0 -> D*- l+ nu, B0 -> J/Psi K0S, …) l Current version based on Geant4.0.1 (+additional development patches) l Integrated in BaBar environment n primary generators, reconstruction, OODB persistency (materials & geometry description parameters, events) n parameters for materials and geometry shared with reconstruction applications BaBar Geant4-based Simulation

19. Maria Grazia Pia, INFN Genova 19 SVT Silicon Vertex Tracker EMC Electro Magnetic Calorimeter Examples of BaBar Geant4 geometries

20. Maria Grazia Pia, INFN Genova 20 Borexino ]Geant4 components used to track photons l geometry l physics processes pertinent to optical photons (reflection, rifraction, absorption etc.) l visualisation ]They have developed absorption and reemission processes typical of Borexino scintillator

21. Maria Grazia Pia, INFN Genova 21 Borexino

22. 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

23. Maria Grazia Pia, INFN Genova 23 Low Energy processes for medical applications

24. Maria Grazia Pia, INFN Genova 24 Bragg peak

25. Maria Grazia Pia, INFN Genova 25 Space applications

26. 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 l modular, flexible, extensible l the physics is clearly exposed

27. Maria Grazia Pia, INFN Genova 27 Performance ]Geant4 - Geant3.21 comparisons l Realistic detector configurations l All results and plots available at http://wwwinfo.cern.ch/asd/geant/geant4_public/gallery/ EMbenchmarks pBenchmark in liquid Argon + Pb calorimeter l At a comparable physics performance Geant4 is faster than Geant3.21 F by a factor >3 using exactly the same cuts F by a factor >10 when Geant4 cuts are optimized, keeping the same physics performance l At comparable speed, Geant4 physics perfomance is far superior to Geant3.21 one pBenchmark in thin silicon layer l Single volume, single material l 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

28. 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 l INFN (Genova, Torino, Cosenza) l Istituto Nazionale per la Ricerca sul Cancro l Università del Piemonte Orientale (Novara) l ESA l CERN ]Multi-disciplinary Collaboration of l astrophysicists and space scientists l particle physicists l medical physicists l biologists l physicians ]First phase of the project: User Requirements

29. Maria Grazia Pia, INFN Genova 29 Conclusions ]Geant4 is used in a variety of applications l HEP and nuclear physics experiments l astrophysics and astro-particle physics l space science studies l medical physics l etc. ]Several experiments are already in an advanced stage of their Geant4-based applications l complex geometry descriptions l comparisons with experimental data l production mode ]Various new tools offered by Geant4 respond to essential needs of some user communities l CAD interface l extensions of the physics processes covered l new physics l standard-compliant tools l etc.