Curved neutron guide of the cold neutron disk-chopper spectrometer at J-PARC

Article type: Research Article

Authors: Kajimoto, R. | Nakajima, K. | Nakamura, M. | Osakabe, T. | Sato, T.J. | Arai, M.

Affiliations: Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan | Institute for Solid State Physics, University of Tokyo, Tokai, Ibaraki 316-1106, Japan

Note: [] Corresponding author. Email: ryoichi.kajimoto@j-parc.jp

Note: [] Present address: Materials and Life Science Division, J-PARC Centre, Tokai, Ibaraki 319-1195, Japan.

Note: [] Present address: Materials and Life Science Division, J-PARC Centre, Tokai, Ibaraki 319-1195, Japan.

Note: [] Present address: Materials and Life Science Division, J-PARC Centre, Tokai, Ibaraki 319-1195, Japan.

Note: [] Present address: Materials and Life Science Division, J-PARC Centre, Tokai, Ibaraki 319-1195, Japan.

Abstract: We have investigated the usefulness of a curved guide for the cold neutron disk-chopper spectrometer (CNDCS), which is under construction for the Japan Proton Accelerator Research Complex (J-PARC), by Monte Carlo simulation. By comparing with a model with a straight guide and a T0 chopper, we found that the curved guide can show comparable performance with the straight guide in the whole energy range of CNDCS when L1 ≥ 30 m. Interestingly, the curved guide surpasses the straight guide in neutron flux at E ≤ 20 meV, where CNDCS is optimized, because of the loss of flux at the gap for the T0 chopper in the straight guide.

Keywords: Neutron transport, Spallation neutron source, Chopper spectrometer, J-PARC

DOI: 10.1080/10238160902819346

Journal: Journal of Neutron Research, vol. 16, no. 3, 4, pp. 81-86, 2008