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VITESS

The Virtual Instrumentation Tool for the ESS (VITESS) is an open source software package for the simulation of neutron scattering experiments. The software is maintained and developed by the Helmholtz-Zentrum Berlin für Materialien und Energie (HZB), the former Hahn-Meitner-Institur HMI, and available for Windows, Linux and Macintosh on the VITESS homepage. It is widely used for simulation of existing neutron scattering instruments as well as for the development of new instruments.

VITESS was initiated by F. Mezei in 1998, closely followed by the first release of VITESS in 1999 and version 2 in 2001. The current version 3 including an X3D visualization interface has been released in November 2012.

Although it was initially developed to aid the design of neutron scattering instruments for the European Spallation Source (ESS) as the name implies, VITESS serves as a generic simulation tool for a large variety of neutron scattering instruments at all major pulsed or continuous neutron sources. It comprises all established instrument hardware such as neutron optics (e.g. guides, apertures, lenses), wavelength selectors (e.g. disc choppers, velocity selectors) and a growing variety of samples, allowing to perform virtual experiments including sophisticated setups like polarized neutrons in magnetic fields.

Parameters specifying the instrument components can be given by means of a graphical user interface, which makes VITESS comparably easy to use and quick to learn for new users, while advanced users can contribute their own modules. The validity of VITESS simulations is tested by comparison with other neutron simulation packages and with measurements at neutron scattering facilities.

Other simulation packages for neutron scattering instruments include McStas, Restrax, NISP and IDEAS.