Recent Improvements in Geant4 Electromagnetic Physics Models and Interfaces

Abstract

An overview of the electromagnetic (EM) physics of the Geant4 toolkit is presented Two sets of EM models are available: the 'Standard' initially focused on high energy physics (HEP) while the 'Low-energy' was developed for medical, space and other applications The 'Standard' models provide a faster computation but are less accurate for keV energies, the 'Low-energy' models are more CPU time consuming A common interface to EM physics models has been developed allowing a natural combination of ultra-relativistic, relativistic and low-energy models for the same run providing both precision and CPU performance Due to this migration additional capabilities become available The new developments include relativistic models for bremsstrahlung and e+e- pair production, models of multiple and single scattering, hadron/ion ionization, microdosimetry for very low energies and also improvements in existing Geant4 models In parallel, validation suites and benchmarks have been intensively developed (author)