Data reduction for multi-Ei neutron time-of-flight at long-pulse sources

Topic  24
Main supervisor C.Franz (
MLZ institution FZJ
Local supervisor 1 Mads Bertelsen
Institution ESS
Local supervisor 2
Local supervisor 3
Local supervisor 4
Title Data reduction for multi-Ei neutron time-of-flight at long-pulse sources
Description The European Spallation Source (ESS), currently under construction in Lund, Sweden is the future world leading neutron source. Forschungszentrum Jülich, a MLZ partner, is contributing to four instruments. One of them is T-REX, a bi-spectral chopper spectrometer.
T-REX will probe mainly single crystals of low dimensional, topological and frustrated materials, quantum magnets, high temperature superconductors, multifunctional oxides, molecular magnets and functional materials, such as catalysis metals, ion-transport materials, fuel cell membranes, nanomaterials, thermo-electric and magneto-caloric materials.
To make the best use of the ESS´s long neutron pulse, the instrument makes heavy use of the repetition rate multiplication (RRM) technique, sometimes also referred to as multi-Ei mode. This mode extracts several monochromatic pulses out of one ESS pulse, boosting the instrument performance and leading effectively to five-dimensional datasets for single crystals. However, novel strategies are needed to reduce those datasets.
The focus of the project is to develop a digital twin of the instrument using Monte Carlo ray-tracing simulations and their integration into the Nicos operational software. Using the digital twin, artificial datasets can be created to develop and test the subsequent reduction chain. The data reduction software will be developed in close cooperation with the ESS Data Management & Software Centre.