A super-resolution technique to analyze single-crystal inelastic neutron scattering measurements using direct-geometry chopper spectrometers

Abstract

Direct-geometry time-of-flight chopper neutron spectroscopy is instrumental in studying dynamics in liquid, powder, and single crystal systems. We report here that real-space techniques in optical imagery can be adapted to obtain reciprocal-space super resolution dispersion for phonon or magnetic excitations from single-crystal neutron spectroscopy measurements. The procedure to reconstruct super-resolution energy dispersion of excitations relies on an accurate determination of the momentum and energy-dependent point spread function and a dispersion correction technique inspired by an image disparity calculation technique commonly used in stereo imaging. Applying these methods to spinwave dispersion data from a virtual neutron experiment demonstrates ∼5-fold improvement over nominal energy resolution.

Second Target Station Project (CHESS Technical Report)

“…The simulations have been reduced and analyzed with the Mantid software [Arnold 2014], following the same reduction procedure currently used at instruments at SNS. Future upgrades to the software package will allow CHESS to merge all the RRM energies into a single file and use super-resolution techniques [Lin 2022] for this analysis.…”

Spin wave Hamiltonian and anomalous scattering in NiPS$_3$

“…This profile is then used to calculate point spread functions (PSF) on a discrete array across the slice by using the dgsres tool in McVINE [44]. Next the PSFs are fit to provide parameters that allow interpolation of the resolution to any point in the slice [45]. The model slice to convolute was then calculated in SpinW on a grid much finer than the resolution.…”