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The Small-K Advanced DIffractometer (SKADI) [1,2] small-angle neutron scattering (SANS) instrument will be constructed at the European Spallation Source (ESS) as an in-kind contribution led by Forschungszentrum Jülich (Germany) in collaboration with Laboratoire Léon Brillouin (France).

SKADI is a versatile SANS instrument, which will enable scientists to perform a wide range of investigations on topics requiring small scattering angles to access long length scales. The scientific areas targeted by SKADI include investigations of smart materials, biological and medical research, magnetic materials and materials for energy storage, as well as experiments on nanomaterials and nanocomposites or colloidal systems. These experiments promise a high potential impact on science and society. To maximize the societal applicability of these studies SKADI is designed to accommodate in-situ measurements with custom made sample environments to provide "real-world" conditions.

SKADI-1SKADI Overview Image with shielding removed. Neutrons are passing through the instrument from the moderator (left), through the sample, to the detector (right).
Copyright: Forschungszentrum Jülich

All SKADI key components are designed to meet the goal of delivering the infrastructure for outstanding scientific experiments. The corresponding design decisions are flexibility of the sample area (3x3 m2, generic mounting system for custom made sample environments), access to very small scattering angles by using focusing elements (Q ≥ 10−4 Å−1, corresponding to a size resolution of several micrometers.), polarization for magnetic samples and incoherent background subtraction, excellent wavelength resolution, tune-able down to ∆λ/λ = 1% [3] and a high dynamic Q-range, covering three orders of magnitude for structural investigations from nanometers to micrometers.

SKADI-1Artistic impression of the SKADI science case. At the bottom both the covered size and Q-range is indicated.
Copyright: Forschungszentrum Jülich

Along with the SKADI construction we were able to secure third party funding for the development of a neutron detector within the Horizon 2020 framework of the EU (funding reference No. 654124). [4] The Solid State Neutron Detector (SoNDe) project aims at the development of a high-flux capable neutron detector for the application in neutron scattering instruments at spallation sources, such as the ESS.

In concert these two projects will advance the capabilities for SANS and therefore allow advances in material analysis to be made on a world-class level. This progress in technological abilities will benefit a wide range of scientific fields from medical research to material sciences as mentioned above. As both projects are performed in collaboration with strong European partners (LLB, ESS), they also improve the international visibility and involvement of the JCNS in large-scale scientific facilities.


Forschungszentrum Jülich (DE): Sebastian Jaksch, Henrich Frielinghaus, Romuald Hanslik
Laboratoire Léon Brillouin (FR): Jacques Jestin, Sylvain Désert

References and Links

[1] Jaksch, S.; Martin-Rodriguez, D.; Ostermann, A.; Jestin, J.; Pinto, S. D.; Bouwman, W.; Uher, J.; Engels, R.; Frielinghaus, H.,
Concept for a time-of-flight Small Angle Neutron Scattering instrument at the European Spallation Source.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2014, 762, 22-30.

[2] ESS website feature on SKADI

[3] Jaksch, S.,
Considerations about chopper configuration at a time-of-flight SANS instrument at a spallation source.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2016, 835, 61-65.

[4] SoNDe Webpage

Contact Information

Sebastian Jaksch

Henrich Frielinghaus