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Part IV

Part IV. Geant4 results. 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 .

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Part IV

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  1. Part IV Geant4 results

  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 • ...

  3. Geometries

  4. Cuts in range (G3/G4)

  5. Visible energy in Si vs energy of the incident electron: G3, G4, data

  6. Multiple scattering in thin layers

  7. Backscattering

  8. Low energy e.m. extensions

  9. High energy muons

  10. Geant4 hadronic physics

  11. Hadronic models, parameterised

  12. Photon evaporation

  13. Stopping pions

  14. Neutrons

  15. Atlas geometry

  16. CMS geometry and magnetic field

  17. CMS e.m. calorimeter

  18. BaBar Geant4-based Simulation • 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

  19. Examples of BaBar Geant4 geometries EMC Electro Magnetic Calorimeter SVT Silicon Vertex Tracker

  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

  21. Borexino

  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. Low Energy processes for medical applications

  24. Bragg peak

  25. Space applications

  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

  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 Geant4is 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. 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

  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.

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