Abstract
Small-K Advanced DIffractometer (SKADI is a Small-Angle Neutron Scattering (SANS) instrument to be constructed at the European Spallation Source (ESS). SANS instruments allow investigations of the structure of materials in the size regime between Angstroms up to micrometers. As very versatile instruments, they usually cater to the scientific needs of communities, such as chemists, biologists, and physicists, ranging from material and food sciences to archeology. They can offer analysis of the micro- and mesoscopic structure of the samples, as well as an analysis of the spin states in the samples, for example, for magnetic samples. SKADI, as a broad range instrument, thus offers features, such as an extremely flexible space for the sample environment, to accommodate a wide range of experiments, high-flux, and optimized detector-collimation system to allow for an excellent resolution of the sample structure, short measurement times to be able to record the internal kinetics during a transition in the sample, as well as polarized neutron scattering. In this manuscript, we describe the final design for the construction of SKADI. All of the features and capabilities presented here are projected to be included into the final instrument when going into operation phase.
Highlights
The Small-K Advanced DIffractometer (SKADI, for the naming we exploited the correspondence between the reciprocal space vector K and momentum transfer vector Q) is a joint in-kind project of French (LLB) and German (FZ Jülich) partners to deliver a Small-Angle Neutron Scattering (SANS) instrument to the European Spallation Source (ESS) [1,2]
SKADI, as a broad range instrument, offers features, such as an extremely flexible space for the sample environment, to accommodate a wide range of experiments, high-flux, and optimized detector-collimation system to allow for an excellent resolution of the sample structure, short measurement times to be able to record the internal kinetics during a transition in the sample, as well as polarized neutron scattering
We describe the final design for the construction of SKADI
Summary
The Small-K Advanced DIffractometer (SKADI, for the naming we exploited the correspondence between the reciprocal space vector K and momentum transfer vector Q) is a joint in-kind project of French (LLB) and German (FZ Jülich) partners to deliver a Small-Angle Neutron Scattering (SANS) instrument to the European Spallation Source (ESS) [1,2]. In order to transfer the highest amount of neutrons per second, solid angle, angular divergence, and time, i.e., brilliance, to the sample the complete instrument has to be considered, since any component that is influencing the flow of neutrons can absorb or deflect them. Special focus, in this case, has to be given to the extraction of neutrons from the moderator in order to maximize the brilliance transfer while avoiding a direct line of sight between sample and moderator to minimize unwanted background, for example, from γ-radiation. The data will be recorded in event-mode, i.e.,with a time-stamp for each single neutron event on the detector This will allow for cross-referencing additional settings of motor positions or sample environments to a specific neutron event. All of the simulations shown here have been carried out using the McStas framework [9]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call