Simulation of energy dispersive mode for RITA-type cold neutron triple axis spectrometer SIKA

Abstract

SIKA, a high flux cold triple axis spectrometer at OPAL reactor, is equipped with a 13-blade analyser and position sensitive detector. This multiplexing design endows SIKA with high flexibility to run in either traditional or dispersive modes. In this study, the energy dispersive mode for two different energy transfers is simulated using the Monte Carlo ray-trace package SIMRES. The results show that SIKA could work effectively in this mode at low and intermediate energy transfers with reasonable energy and Q resolution. The simulated energy resolution is about 0.23 meV for an energy transfer of ħω = 5 meV and increases to 1.8 meV for ħω = 15 meV. This work provides a valuable reference for future inelastic neutron scattering experiments on SIKA.