The Design of the Neutron Total Scattering Spectrometer for Hydrogenous Materials at J-PARC-JSNS

Abstract

The design, performance, philosophy, lessons learned and advantages of the neutron total scattering spectrometer for hydrogenous materials, FAST, under consideration for the J-PARC-JSNS, are described. In particular, novel instrumentation concept such as the small fractional scattered neutron flight path, γ = L₂/(L₁ + L₂), where L₁ is the incident flight path, moderator to sample, L₂ is the scattered neutron flight path from sample to detector, is presented and their expected performance at the JSNS is considered.