PARSIFAL (PARametrized SImulation) is a tool which reproduces a triple-GEM
detector full response to the passage of a charged particle, taking into
account most of the involved physical effects. A triple-GEM is a gaseous
detector that amplifies the primary ionization, generated by the incoming
radiation interacting with the gas, through three amplification stages,
providing position measurement with a resolution around 100 micron, energy
resolution better than 20% and time resolution below 10 ns. Despite well known
and robust software such as GARFIELD++ can simulate the electron propagation in
gas and the interaction with the electric field, considering the avalanche
formation and signal creation, they are CPU-time consuming. The necessity to
reduce the processing time while maintaining the precision of a full simulation
is the main driver of this work. PARSIFAL takes into account the main processes
involved in the signal formation, starting from ionization, spatial and
temporal diffusion, the effect of the magnetic field, if any, and GEM
amplification properties. The induction of the signal and the electronics
response are also present. PARSIFAL parameters are evaluated by means of
GARFIELD++ simulations; the results of the simulation are compared to
experimental data from testbeam and tuning factors are applied to improve the
matching.Comment: submitted to JINS