TY - JOUR
T1 - Cold-neutron disk-chopper spectrometer at J-PARC
AU - Nakajima, K.
AU - Nakamura, M.
AU - Kajimoto, R.
AU - Osakabe, T.
AU - Kakurai, K.
AU - Matsuda, M.
AU - Metoki, M.
AU - Wakimoto, S.
AU - Sato, T. J.
AU - Itoh, S.
AU - Arai, M.
AU - Yoshida, K.
AU - Niita, K.
PY - 2007
Y1 - 2007
N2 - We are constructing a cold-neutron double-chopper spectrometer for the new spallation neutron source at the Materials and Life Science Facility (MLF), J-PARC. The spectrometer is dedicated to inelastic and quasi-elastic measurements in the cold and thermal neutron incident energy region of Ei = 1-80 meV. Looking at a H2-coupled moderator and employing a combination of two fast disk-choppers, one as the pulse-shaping and another as the monochromating chopper, the spectrometer realizes both high intensity and fine resolution. The expected neutron flux at the sample position is of the order of 104-107 n/cm2/s depending on Ei (e.g. 106 n/cm2/s at Ei = 20meV with ΔE/Ei = 3%). The newly developed fast diskchopper enables a fine and tunable energy resolution (ΔE/Ei ≥ 1% at Ei = 20 meV). A large area detector bank (±1358 in horizontal, -22-+30° in vertical and 1.3π in solid angle) covers wide momentum transfer range with the resolution of a few percent of ΔQ/ki, where ΔQ is the uncertainty in the longitudinal component of the scattering vector. The spectrometer is planned to be ready in 2008, when the first neutron beam at MLF, J-PARC is expected.
AB - We are constructing a cold-neutron double-chopper spectrometer for the new spallation neutron source at the Materials and Life Science Facility (MLF), J-PARC. The spectrometer is dedicated to inelastic and quasi-elastic measurements in the cold and thermal neutron incident energy region of Ei = 1-80 meV. Looking at a H2-coupled moderator and employing a combination of two fast disk-choppers, one as the pulse-shaping and another as the monochromating chopper, the spectrometer realizes both high intensity and fine resolution. The expected neutron flux at the sample position is of the order of 104-107 n/cm2/s depending on Ei (e.g. 106 n/cm2/s at Ei = 20meV with ΔE/Ei = 3%). The newly developed fast diskchopper enables a fine and tunable energy resolution (ΔE/Ei ≥ 1% at Ei = 20 meV). A large area detector bank (±1358 in horizontal, -22-+30° in vertical and 1.3π in solid angle) covers wide momentum transfer range with the resolution of a few percent of ΔQ/ki, where ΔQ is the uncertainty in the longitudinal component of the scattering vector. The spectrometer is planned to be ready in 2008, when the first neutron beam at MLF, J-PARC is expected.
KW - Chopper spectrometer
KW - Disk-chopper
KW - Inelastic neutron scattering
KW - J-PARC
UR - https://www.scopus.com/pages/publications/85013598599
U2 - 10.1080/10238160601045722
DO - 10.1080/10238160601045722
M3 - Article
AN - SCOPUS:85013598599
SN - 1023-8166
VL - 15
SP - 13
EP - 21
JO - Journal of Neutron Research
JF - Journal of Neutron Research
IS - 1
ER -