Abstract
A new tandem analyzer crystals system was introduced on Bonse–Hart ultra-small-angle neutron-scattering spectrometer at research reactor JRR-3, Tokai, Japan. Conventional Bonse–Hart setup consumes a considerable time to measure a scattering profile of whole q range (2×10 −4 nm −1< q<7×10 −2 nm −1, where q denotes magnitude of scattering vector) due to the step scan system, in which the scattered neutrons from the sample and having different q are measured step by step. To overcome this difficulty two analyzer channel-cut silicon perfect crystals were settled in tandem and each of them diffracted the scattering of different q. In consequence, a simultaneous detection at two different q positions was realized and the measurement time was reduced to half.
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