MUFASA: MUon FAst Simulation Algorithm

This note describes the simulation code named MUFASA (MUon FAst Simulation Algo- rithm), developed to study the muon pair production due to the interaction of a positron beam with a target using a custom Monte Carlo, while also providing an interface with the particle tracking code MADX PTC. MUFASA is a powerful tool developed as a start-to- end simulation code for the study of the muon production and accumulation process for the Low EMittance Muon Accelerator (LEMMA) [1], in order to test different targets, op- tics and configurations. In this paper the structure of the code is described and validation tests performed with GEANT4 [2] together with some example of results are shown.