GLECS and GLEPS
GEANT3 Low-Energy Compton Scattering Packages

GLECS is an extension program for the GEANT3 simulation package that incorporates detailed physics into the simulation of Compton and Rayleigh scattering. In standard GEANT3, the free electron approximation is used for Compton scattering, and there are major errors in the way Rayleigh scattering is performed. These problems lead to significant errors in simulating scattering below a few hundred keV. The GLECS treatment of Compton scattering accounts for bound electron momentum on a shell-by-shell basis using evaluated data read from tables. For Rayleigh scattering, GLECS uses evaluated coherent scattering cross section and form factor data read from tables. Note that the treatment of Rayleigh scattering was upgraded in GLECS v3.0. For more details and installation instructions see the README file below.

 

View the GLECS README file Download/Version Compatibility

 

View a paper about GLECS (New Astronomy, 2004) View a test report about GLECS (from Elena Novikova, NRL)

 

 

GLEPS is an extension of GLECS adapted by Mark McConnell (Univ. of NH) to include the effects of polarized incident photons in the Compton and Rayleigh processes. As in GLECS, Doppler broadening in Compton scattering can be switched on or off. Polarization effects are included only for the primary (incident) photon. GLEPS tracks the polarization of the primary photon through all subsequent scatters (both Compton and Rayleigh scatters). GELPS does not handle the polarization of secondary photons that may be produced, primarily because the secondary production processes in GEANT3 do not specify polarization. Changes in future releases of GLECS will be propagated into GLEPS to ensure compatibility. For more details and installation instructions see the README file below."

 

View the GLEPS README file Download/Version Compatibility

 

View a poster about GLEPS (AAS-HEAD, 2004)

 

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Author: R. Marc Kippen
Last modified: Fri Dec 15 2006