  The MARS15(2012) is the latest version of a multi-purpose Monte-Carlo code
developed since 1974 for detailed simulation of hadronic and electromagnetic
cascades in an arbitrary 3-D geometry of shielding, accelerator, detector and
spacecraft components with energy ranging from a fraction of an electronvolt to
100 TeV. Driven by needs of the intensity frontier projects with their Megawatt
beams, e.g., ESS, FAIR and Project X, the code has been recently substantially
improved and extended. These include inclusive and exclusive particle event
generators in the 0.7 to 12 GeV energy range, proton inelastic interaction
modeling below 20 MeV, implementation of the EGS5 code for electromagnetic
shower simulation at energies from 1 keV to 20 MeV, stopping power description
in compound materials, new module for DPA calculations for neutrons from a
fraction of eV to 20-150 MeV, user-friendly DeTra-based method to calculate
nuclide inventories, and new ROOT-based geometry.
