NA62 simulation package (NA62MC) is based on GEANT4 for the detector description, TURTLE for the beam optics upstream the first detector (Cedar/KTAG), and a set of custom decay generators (mostly for kaons) that include form factors and radiative corrections. TURTLE simulates pure optics and no particle interaction; it is possible to generate a separate MC sample using as external input the result of Halo simulation, wich includes interactions in the material of the beam elements.

The detector description exploits the longitudinal development of the experiment and subdivides the GEANT4 volumes hierarchy accordingly, in slices, simplifying both implementation and maintenance.

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