Electromagnetic Physics I Joseph Perl SLAC National Accelerator Laboratory (strongly based on Michel Maire's slides) Geant4 v9.3.p01 Standard EM package.

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Presentation transcript:

Electromagnetic Physics I Joseph Perl SLAC National Accelerator Laboratory (strongly based on Michel Maire's slides) Geant4 v9.3.p01 Standard EM package

Outline ● EM physics processes available ● How to invoke them in a physics list ● Important sampling processes – Compton scattering – ionization – multiple scattering ● Energy-range relation and stepping

Post Step At Rest Along Step -1 - parameter to indicate InActive DoIt

γ e-e-

e-e- proton alpha

Summary ● Standard EM physics processes are available for gammas and charged particles from 1 keV and up ● EM processes must be ordered in the physics list ● EM processes are based on theoretical cross sections with corrections. During simulation, quantities are taken from tables calculated at initialization time ● Multiple scattering is handled by model functions which represent fits to Lewis transport theory results (not Moliere) ● Energy-range relation is used to compute energy loss, and to control step lengths and secondary production

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