High-q performance of the J-PARC small-angle neutron scattering instrument (HI-SANS) for observation of biological molecules with atomic resolution

Takata, Shinichi  ; Suzuki, Junichi; Shinohara, Takenao   ; Oku, Takayuki   ; Suzuya, Kentaro; Aizawa, Kazuya  ; Otomo, Toshiya*; Arai, Masatoshi

For the clarification and enhancement of function of biological molecules with nm size, we believe that small-angle neutron scattering measurement in wide-q range giving structural information of the molecules with atomic resolution is important. We have thus designed the high-intensity small-angle neutron scattering instrument HI-SANS for the J-PARC in order to carry out the efficient measurement in wide-q range including high-q range of 1-100 nm. In the design work we have performed Monte Carlo simulation of neutron scattering from typical proteins in solution using the scattering function based on the Debye formula. In this paper we present the q-resolution required from the simulation and then show detector arrangement to realize the q-resolution and counting efficiency expected with the detector arrangement.