McStas logo McStas - A neutron ray-trace simulation package ILL; PSI; ESS Niels Bohr Institute DTU Physics NEXMAP

McStas

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McStas - Monte Carlo simulation of neutron instruments

McStas is an ongoing project to create a general tool for simulating neutron scattering instruments. The project is a collaboration between DTU Physics (formerly RISØ DTU and RISØ Natnl. Lab), European Spallation Source, University of Copenhagen, Paul Scherrer Institute and Institut Laue-Langevin.

The efforts have historically been funded through multiple EU programs.

The software is freely available and can be downloaded from this site.

McStas is based on a compiler that reads a high-level specification language defining the instrument to be simulated and produces C code that performs the Monte Carlo Simulation. The system is very fast in use, both when setting up the instrument definition and when doing calculations. Typical figures are 500000 neutron histories per second on a fast PC.

McStas supports triple-axis,  time-of-flight instruments, and polarised neutrons. It comes with a comprehensive manual and a library of well-tested components that include most standard elements of neutron scattering instruments, including steady-state and pulsed sources, monochromators/analysers, guides, collimators, vanadium and powder samples, velocity selectors and choppers, and a variety of detectors.

McStas runs on most of the popular computer systems (Unix/Linux, Windows, macOS). Please refer to our GitHub installation pages for installation requirements.

This software required a substantial effort to be brought to you. If you enjoy this software, please use the folowing references in your work:

  • Conditions of use
  • Authors and contacts
  • McStas - Project funding

  • Last Modified: Monday, 17-Dec-2018 10:41:01 CET
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