Speaker
Description
LET is a cold time-of-flight chopper spectrometer installed on the second target station at the ISIS facility. With nearly π st. of continuous detector coverage, it is primarily used to map excitation spectra in single crystals of magnetic materials. Beyond this application, its high resolution makes it well suited for quasi-elastic scattering (QENS) studies of energy materials, soft matter, and biological systems. Here, we present the new uniaxial polarization analysis option on LET, which features a wide-angle 3He spin filter analyser that provides access to the full LET detector. The potential of the instrument to perform polarized QENS experiments is illustrated by the example of D2O, where the separation of the coherent and incoherent components of the cross section has proven essential to understand the evolution of the collective (coherent) and single-particle (incoherent) dynamics from atomic to intermediate length-scales.
