PARSIFAL: Parametrized simulation of triple-GEM and micro-RWELL response to a charged particle

Abstract

PARSIFAL (PARametrized SImulation) is a software tool that can reproduce the complete response of both triple-GEM and micro-RWELL-based trackers. It takes into account the involved physical processes by their simple parametrization and thus in a very fast way. Existing software such as GARFIELD++ is robust and reliable, but CPU time-consuming. The implementation of PARSIFAL was driven by the necessity to reduce the processing time, without losing the precision of a complete simulation. A series of parameters, that can be extracted from the GARFIELD++ simulation, are set as input to PARSIFAL, which then runs independently from GARFIELD++. PARSIFAL can simulate samples with high statistics much faster, taking into account the various steps (ionization, diffusion, multiplication, signal induction, and electronics) from the simple sampling from parameterized distributions. In the case of the micro-RWELL MPGD, the effect of the high resistivity layer on the charge spread on the anode was introduced, following M.S. Dixit and A. Rankin’s treatment. PARSIFAL was used to simulate triple-GEM chambers and the results were tuned to match experimental data from testbeams. In this case, the adopted electronics was APV-25 readout by SRS system, which has been simulated in the code. The same procedure was later applied to micro-RWELL chambers, readout by the TIGER ASIC and the GEMROC system. These new electronics were added to PARSIFAL code, and the simulated-to-real data was tuned. A presentation of the full code will be given in this contribution, setting the focus on the latest implementations and a first comparison with experimental data from micro-RWELL.