Use of 2π-PSD systems for quasielastic neutron time-of-flight experiments

Article type: Research Article

Authors: Lechner, R.E.

Affiliations: Science Office, Hohenzollernstrasse 5b, D-14109 Berlin, Germany

Note: [] Email: [email protected]

Abstract: Very-large-area detector systems for low-energy-transfer time-of-flight spectrometers are discussed. Four different kinds of linear position-sensitive detector arrays with spherical- or cylindrical-zone geometries are considered. A non-uniform sample–detector distance is involved, varying by up to 40% for cylindrical symmetry using 5 m long linear position-sensitive detectors (PSDs). Integration over large solid-angle regions causes practical consequences for data treatment, but no serious problems for spectrometer performance. We demonstrate that energy-resolution function, PWR optimization, and duration of spectral periods are essentially not deteriorated. Consequences for the normalization of measured neutron scattering data and mechanical detector implementation are discussed.

Keywords: Quasielastic TOF instruments, Large PSD systems, Energy resolution, Optimization

DOI: 10.1080/10238160601045565

Journal: Journal of Neutron Research, vol. 16, no. 1, 2, pp. 23-29, 2008