Abstract
Neutron spin echo (NSE) method at a pulsed neutron source presents new challenges to the data reduction and analysis as compared to the instruments installed at reactor sources. The main advantage of the pulsed source NSE is the ability to resolve the neutron wavelength and collect neutrons over a wider bandwidth. This allows us to more precisely determine the symmetry phase and measure the data for several Q-values at the same time. Based on the experience gained at the SNS NSE – the first, and to date the only one, NSE instrument installed at a pulsed spallation source, we propose a novel and unified approach to the NSE data processing.
Highlights
Neutron spin echo spectroscopy has become a standard technique for condensed matter research [1, 2] and with the advent of spallation sources it has been successfully adopted to the pulsed source environment [3]
The chief difference between an Neutron spin echo (NSE) instrument installed at a pulsed source versus a one installed at a reactor is the ability to resolve the neutron wavelength via the time-of-flight method (TOF)
Different versions of the original reduction software echodet [5] are currently used at the two Julich Centre for Neutron Science (JCNS) instruments making it harder to incorporate new algorithms, new reduction strategies and debugging the software
Summary
Neutron spin echo spectroscopy has become a standard technique for condensed matter research [1, 2] and with the advent of spallation sources it has been successfully adopted to the pulsed source environment [3]. Julich Centre for Neutron Science (JCNS) operates two NSE instruments: one at the Meier-Leibnitz Zentrum (MLZ) in Garching, Germany [4] and the other one at the Spallation Neutron Source (SNS) in Oak Ridge, TN, USA [3], see Fig. 1. The chief difference between an NSE instrument installed at a pulsed source versus a one installed at a reactor is the ability to resolve the neutron wavelength via the time-of-flight method (TOF). Different versions of the original reduction software echodet [5] are currently used at the two JCNS instruments making it harder to incorporate new algorithms, new reduction strategies and debugging the software. The pulsed source evaluation version is essentially a patch on the original reactor code that does not fully take into account the available time-offlight information
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