Speaker
Description
VITESS is a software package to simulate all kinds of instruments at continuous and pulsed neutron sources. It enables virtual experiments, i.e. the propagation of the neutron beam to the sample position, scattering of neutrons at the sample, and determination of their spatial (and temporal) distribution at the detector.
The output of this simulation can be used to feed data evaluation software and thus enables development and preliminary tests without the use of actual neutrons. This approach has been used for the data reduction and evaluation software of the spectrometer TOPAS, which is currently being assembled at the MLZ in Garching. It will be operated directly after the re-start of the research reactor FRM II.
The new VITESS version 3.7 includes new features to enable tests of the data evaluation software: upgraded modules for handling inelastic scattering events and their evaluation, as well as a new module for writing simulation output in the NeXus format, a standard data file format for scattering measurements.
We will present the concept and basic properties of VITESS, highlight the new features introduced in version 3.7 and demonstrate how these features were utilized for virtual experiments, digital twins, and data handling at TOPAS.
