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Single Coulomb Scattering process

Single Coulomb Scattering process. 11 th Geant4 workshop, Hebden Bridge, UK, Sept.13-19 V.N. Ivanchenko, CERN, Geneva, Switzerland. Outline. Motivation New classes Comparison results Problems and summary. Motivation.

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Single Coulomb Scattering process

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  1. Single Coulomb Scattering process 11th Geant4 workshop, Hebden Bridge, UK, Sept.13-19 V.N. Ivanchenko, CERN, Geneva, Switzerland 19 September 2007, V.Ivanchenko

  2. Outline • Motivation • New classes • Comparison results • Problems and summary 19 September 2007, V.Ivanchenko

  3. Motivation • Elastic Coulomb scattering is an important process for particle transport • Multiple scattering may fail at low dense media • beam transport in vacuum • space applications • Provide an alternative to multiple scattering based as much as possible on theory • In view of further development of combined scattering process per particle type 19 September 2007, V.Ivanchenko

  4. New classes • G4CoulombScattering – elastic process • standardSS, standardIG builders • G4eCoulombScatteringModel • no nuclear recoil • main version, all plots below • G4CoulombScatteringModel • Recoil nucleus is provided • Need more validation 19 September 2007, V.Ivanchenko

  5. Physics • Wentzel model with Bethe second order corrections to screening radius • J.M. Fernandez-Varea, R. Mayol, J. Baro, F. Salvat, NIM B73 (1993) 447 • H.A. Bethe, Phys. Rev. 78 (1953) 1256 • Nuclear size corrections • A.V. Butkevich, R.P. Kokoulin, G.V. Matushko, S.P. Mikheyev, NIM A488 (2002) 282 • Scattering off electrons • Z2 -> Z(Z + 1) • no conventional model • Nuclear recoil • is not in any existing model 19 September 2007, V.Ivanchenko

  6. Validation • Two new automatic tests: • Test37 – Sandia data for e- 0.5 MeV • Sandia report • Test41 – MuScat data for μ+ 172 GeV/c • D.Attwood et al., NIM B251 (2006) 41 • More tests will follow 19 September 2007, V.Ivanchenko

  7. Test37 results Integral dose is an important value for LHC – 3 % accuracy Standard cut 0.7 mm 19 September 2007, V.Ivanchenko

  8. Test37 for multi-layer configurations • EMV shows significant deviation from the data • Single scattering model overestimates dose deposition in the last layer and provide slightly longer distribution in dense media 19 September 2007, V.Ivanchenko

  9. 19 September 2007, V.Ivanchenko

  10. 19 September 2007, V.Ivanchenko

  11. G4 9.0 19 September 2007, V.Ivanchenko

  12. G4 9.0 19 September 2007, V.Ivanchenko

  13. Problems and plans • Scattering off electrons • Nuclear recoil • We need more tests • We need to introduce cut in range for nuclear recoil • May be used in other G4 models • Combine models per particle type 19 September 2007, V.Ivanchenko

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