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DOI 10.5286/raltr.2020002
Persistent URL http://purl.org/net/epubs/work/45175165
Record Status Checked
Record Id 45175165
Title Neutron-ray tracing simulations for the upgrade of the primary spectrometer of OSIRIS
Abstract A new supermirror guide is proposed to replace the current neutron guide of the indirect time-of-flight near-backscattering spectrometer OSIRIS. Here we present an extensive Monte Carlo simulation study for the design and optimisation of the new guide system. Amongst the several guide geometries assessed, a curved guide with elliptical defocusing and focusing sections emerged as the best option. The estimated gain in intensity is a factor of 5–6 at the sample position with a homogeneous distribution of the divergence. For single-crystal experiments, the divergence can be controlled by the use of two slits. The elliptic geometry results in a smaller beam spot and smaller samples will particularly benefit from this upgrade. The proposed guide replacement will ensure that the OSIRIS spectrometer will remain competitive in the years to come.
Organisation ISIS , ISIS-OSIRIS , STFC
Funding Information
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Language English (EN)
Type Details URI(s) Local file(s) Year
Report RAL Technical Reports RAL-TR-2020-002. STFC, 2020. RAL-TR-2020-002.pdf 2020