Virtual experiments in a nutshell: Simulating neutron scattering from materials within instruments with McStas

E. Farhi¹ and P. Willendrup²

¹ Institut Laue Langevin, BP. 156, 38042 Grenoble Cedex 9, France
² Risø National Laboratory, Frederiksborgvej 399 PO Box 49, 4000 Roskilde, Denmark

Abstract

We introduce Monte-Carlo methods for neutron scattering with step-by-step examples, using the McStas simulation tool. A selection of neutron instrument components are presented, as well as available sample scattering kernels. All these parts are assembled into more advanced instrument models in order to produce so-called virtual experiments, that is simulations which produce results comparable with experiments. Ways to couple such simulations with other simulation software including molecular dynamics are discussed.