Abstract
Building the European Spallation Source (ESS), the most powerful neutron source in the world, requires significant technological advances at most fronts of instrument component design. Detectors are not an exception. The existing implementations at current neutron scattering facilities are at their performance limits and sometimes barely cover the scientific needs. At full operation the ESS will yield unprecedented neutron brilliance. This means that one of the most challenging aspects for the new detector designs is the increased rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel, pixel or cm2 at the peak of the neutron pulse. This paper focuses on estimating the incident and detection rates that are anticipated for the Small Angle Neutron Scattering (SANS) instruments planned for ESS. Various approaches are applied and the results thereof are presented.
Highlights
: Building the European Spallation Source (ESS), the most powerful neutron source in the world, requires significant technological advances at most fronts of instrument component design
This paper focuses on estimating the incident and detection rates that are anticipated for the Small Angle Neutron Scattering (SANS) instruments planned for ESS
As the ESS source will subject the detectors to unprecedented neutron fluxes, it is scientifically imperative that the new detector requirements are fulfilled
Summary
LoKI (the Low-K Instrument) is a wide simultaneous Q range SANS instrument designed primarily with the needs of the soft matter, biophysics and materials science communities in mind. Multi-component systems need to be studied as a function of multiple environmental conditions with different structures occurring at different length scales. Small gauge volumes are important to study both intrinsically small samples and for performing scans of heterogeneous samples. There is a need to study systems under the sort of non-equilibrium conditions, such as shear fields, found in real world applications. The ESS flux will enable more routine access of these conditions and permit fast kinetic studies on a wider range of samples than is possible today. These scientific requirements motivate the requirements that the detector system have a large angular coverage, have good spatial resolution, and have a high rate capability
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