McStas - A neutron ray-trace simulation package

McStas is a general tool for simulating neutron scattering instruments and experiments. It is actively supported by DTU Physics, NBI KU, ESS, PSI and ILL

Simulated scattering from a hollow-cylinder vanadium sample.

The plot shows the intensity of scattered neutrons (red is highest intensity). The sample is at the center of the sphere with the neutron beam coming from the left. Clearly seen is the shadowing effect of the sample causing a lower intensity opposite the beam. Also seen is the effect of the non-symmetric geometry of the sample, causing lower intensity directly above and to the side of the sample.



Recent news


Migrating from McStas 2.x to 3.x? - Use the wiki-based guides

January 8th, 2025: Monte Carlo Sattelite to ICNS2025

Dear all,

The ICNS2025 conference is taking place in Copenhagen and Lund this summer, and the abstract submission is closing January 15th - in one week.

Of special interest to McStas users:
A satellite event is being planned for July 11th, arranged by Mads Bertelsen, ESS and Peter Willendrup DTU/ESS. We envision a one-day event with contributed talks on instrument simulation and its use, abstract submission will open soon:

Advanced computer simulations methods for neutron scattering instruments

Abstract:
Neutron scattering relies heavily on computer simulations of neutron scattering instrumentation to optimize their performance. These simulation tools are also evolving to be more relevant for a running facility, aiding in both preparation and analysis for individual experiments. It is even becoming possible to make better decisions during experiments by running simulations in parallel.

All the best and hope to see you this summer in Copenhagen,
Peter Willendrup


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