Simulation and implementation of multiplexing modes on cold-neutron triple-axis spectrometer SIKA
Loading...
Date
2020-04-11
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
SIKA, a high-flux cold-neutron triple-axis spectrometer at the open-pool Australian lightwater reactor (OPAL) at the Australian Nuclear Science and Technology Organisation (ANSTO), is equipped with a 13-blade analyser and position-sensitive detector. This multiplexing design endows SIKA high flexibility to run in both traditional triple-axis and multiplexing analyser modes. In this study, two different multiplexing modes on SIKA are simulated using Monte Carlo ray-tracing methods. The simulation results demonstrate SIKA’s capabilities to work in these operational modes, especially, the multi-Q const-Ef mode, where Q is the scattering wavevector and Ef is the final neutron energy. This capability was demonstrated by measuring the phonon dispersion of a Pb single-crystal sample with the multi-Q const-Ef mode on SIKA. Compared to the traditional and multi-analyser triple-axis spectrometers, multiplexing modes on SIKA combine the advantages of the high data-acquisition efficiency and flexibility to focus on local areas of interest in the momentum-energy transfer space, namely, the (Q, ħ ω) space. Crown Copyright © 2020 Published by Elsevier B.V.
Description
Keywords
OPAL Reactor, ANSTO, Australia, Spectrometers, Phonons, Dispersion relations, Cold neutrons, Monte Carlo Method
Citation
Deng, G., & McIntyre, G. J. (2020). Simulation and implementation of multiplexing modes on cold-neutron triple-axis spectrometer SIKA. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 959, 163509. doi:10.1016/j.nima.2020.163509