Abstract
We propose a TOF-type double-crystal ultra-small-angle neutron scattering (USANS) instrument in JSNS. The fundamental arrangement of the TOF-type USANS instrument is the same as a reactor-type USANS instrument. The feature of this instrument is the simultaneous use of harmonics, λ/n (λ is the neutron wavelength, n = 1,2,3 \ldots ). As a result, the covered q-range ( q = (4 \pi \hspace{0.167em} sin \hspace{0.167em} ( \mgreek{f} /2))/ \lambda , where φ is the scattering angle) is extended towards both lower and higher qs than that of a reactor USANS instrument. In addition, an effective intensity gain is achieved by harmonics multiplication. We calculated the performance of the TOF-type USANS instrument on the coupled liquid hydrogen moderator in JSNS.
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