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Takahashi, Nobuaki; Shibata, Kaoru; Sato, Taku*; Kawakita, Yukinobu*; Tsukushi, Itaru*; Nakajima, Kenji; Arai, Masatoshi
no journal, ,
A time-of-flight Si-analyzer backscattering spectrometer (BSS) DNA is proposed for construction in the Materials and Life Science Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC) located in Tokai, Ibaraki, Japan. Four crystal analyzer sets, namely Si(111), Si(311), PG(002) and Ge(311) had been planned to be mounted on it in near-backscattering configurations in two evacuated tanks in order to cover wide energy and momentum transfer ranges that suit research on the dynamics of bio-molecules and proteins. After extensive discussion with instrument scientists of BSSs as well as biophysicists in the committee the highest energy resolution option provided by the Si analyzer came to the highest priority. Therefore the design of the DNA has been rather simplified. Si(111) and Si(311) analyzers will be mounted in a vacuum vessel putting at 43 m away from a coupled moderator to enjoy the highest peak intensity around several meV, which is the elastic energies of the Si analyzers, among three moderators of JSNS, namely the coupled, a decoupled and a decoupled-poison. Because the pulse time-width of the coupled moderator is the widest of the three, it is designed to utilize a pulse-shaping device, which is high speed counter rotating disc choppers, on the beamline staying as far away from the sample position as possible to narrow the time-width. In this paper we will present the conceptual design and the expected performance of the pulse-shape short-flight-length BSS DNA. The obtainable performance will be compared with BSSs at reactor sources as well as a decoupled-poisoned-moderator-source long-flight-length BSS at a spallation neutron source.
Shibata, Kaoru; Takahashi, Nobuaki; Kawakita, Yukinobu*; Sato, Taku*; Tsukushi, Itaru*; Nakagawa, Hiroshi; Fujiwara, Satoru; Nakajima, Kenji; Arai, Masatoshi
no journal, ,
In the pulsed neutron source of the Material and Life Science Facility (MLF) at J-PARC, we are planning and partially beginning the construction of the near backscattering Si crystal analyzer spectrometer DNA. This is the spectrometer to cover the area of the micro-eV energy range in the several spectrometers which are in the construction or planned the construction in MLF.
Suzuki, Junichi; Shinohara, Takenao; Takata, Shinichi; Oku, Takayuki; Kira, Hiroshi; Suzuya, Kentaro; Aizawa, Kazuya; Arai, Masatoshi; Otomo, Toshiya*; Sugiyama, Masaaki*
no journal, ,
Small-angle neutron scattering (SANS) technique has been indispensable in research of microstructures and hierarchical structures in materials science and life science. However, recent progress in nanotechnology and research of complex multi-component or multi-phase systems and non-equilibrium systems has required the SANS technique to enable to produce structural information more efficiently with higher structural and time resolution. The time-of-flight SANS instrument HI-SANS constructed at the 1MW neutron source of J-PARC has potential to satisfy such requirements by simultaneous coverage of wide q-range with high q-resolution by using large area detectors located at positions with short total flight path of neutrons and with polarizing and magnetic focusing devices.