Design of Ultra Small Angle Neutron Scattering (KIST-USANS) at HANARO Cold Neutron Guide, CG4B

The ultra small angle neutron scattering instrument can measure the lower limit of scattering vector to near Q $\sim$ 2.0x10$^{-5}$ {\AA}$^{-1}$ while the upper limit can reach to an intermediate scattering vector Q $\sim$ 10$^{-2}$ {\AA}$^{-1}$ of a typical small angle neutron scattering (SANS) depending on the contrast of sample. USANS is useful when measuring objects that are micron to submicron in size while SANS is useful when measuring objects that are micron to nano in size. When both USANS and SANS were used together, we could measure sizes from micron to nano scale, which is useful when studying the hierarchical structures in the wide scale of Q and total cross-section, d$\Sigma $/d$\Omega $(Q). Recently, KIST has developed the USANS (so called KIST-USANS) at HANARO cold neutron guide hall of KAERI. We will present the instrument design, performance, future plan, and some examples of measurements that cover approximately 11 orders of magnitude in the d$\Sigma $/d$\Omega $(Q) and 4 orders in the Q.