Speaker
Joanna Weng
(Karlsruhe/CERN)
Description
An object-oriented package for parameterizing electromagnetic showers in the
framework of the Geant4 toolkit has been developed. This parameterization is based on
the algorithms in the GFLASH package (implemented in Geant3 / FORTRAN), but has been
adapted to the new simulation context of Geant4. This package can substitute the full
tracking of high energy electrons/positrons(normally form above 800 MeV ) inside
Geant4 with the probability density function of the shower profile. A mixture of full
simulation and fast parameterization is also possible. This new implementation of the
GFLASH package leads to a significant gain in simulation time for pp events at 14 TeV
at the LHC, without sacrificing too much the simulation accuracy and can be used for
any homogenous calorimeter. GFLASH has been also included into the GEANT 4.7 release
and the CMS detector imulation OSCAR, which is based on Geant4. Some GFLASH
parameters has been also tuned to achieve better agreement with the CMS
electromagnetic calorimeter. Comparisons between GFLASH and full simulation in timing
and physics performance will be presented as well.
Author
Joanna Weng
(Karlsruhe/CERN)
