McStas: Past, present and future

Peter Kjær Willendrup, Emmanuel Farhi, Erik Bergbäck Knudsen, U. Filges, Kim Lefmann

Research output: Contribution to journalJournal articleResearchpeer-review


The McStas neutron ray-tracing simulation package is a collaboration between Risø DTU, ILL, University of Copenhagen and the PSI. During its lifetime, McStas has evolved to become the world leading software in the area of neutron scattering simulations for instrument design, optimisation, virtual experiments. McStas is being actively used for the design-update of the European Spallation Source (ESS) in Lund. This paper includes an introduction to the McStas package, recent and ongoing simulation projects. Further, new features in releases McStas 1.12c and 2.0 are discussed.
Original languageEnglish
JournalJournal of Neutron Research
Issue number1
Pages (from-to)35-43
Publication statusPublished - 2014


  • Neutron
  • Instruments
  • Monte Carlo
  • Ray-tracing


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