Speaker
Description
Polarised neutrons have long been used to study magnetic structures and dynamics in nano- to meso-scales [1]. In soft matter studies, polarisation analysis has recently been shown to be an important method to determine coherent and single-particle motions in QENS in the intermedia length scale where diffusion occurs [2,3]. Owing to the persistent push to advance the technology, polarised neutron has changed from a scarce resource that often requires an instrumentation expert to carry out measurements, to becoming a commonly available resource that can benefit a considerably wider research community. To date, 40% of instruments are providing polarised neutron capability.
To meet the coming user demand, eleven of the fifteen ESS instruments [4] under construction aim to offer polarised neutrons for user experiments, including three spectrometers CSPEC, MIRACLES, T-REX that are most suited to study diffusion and other slow dynamics. In conjunction with in-kind contributions and instrument grants, the ESS Polarisation Project will support nine of the eleven instruments to incorporate polarisation analysis capabilities [5]. Neutron spin filters based on polarised 3He technologies and polarising supermirror devices are selected according to the different neutronic requirements and constraints on each instrument. An update of the project will be presented with highlights on some of the instrumentation innovations and improvements.
[1] Chatterji, Tapan, ed. Neutron scattering from magnetic materials. Elsevier, 2005.
[2] A. Arbe, et. al., Phys. Rev. Research 2, 022015(R) (2020).
[3] A. Arbe, et. al., J. Chem. Phys. 158, 184502 (2023).
[4] K. Andersen, et. al., Nucl. Instrum. Methods A 957, 164302 (2020).
[5] W.T. Lee et. al., EPJ Web Conf. 286 03004 (2023).
