Backscattering Spectrometers at the ESS

Article type: Research Article

Authors: Andersen, K.H.

Affiliations: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, UK

Note: [] Present address: Institut Laue-Langevin, 6 rue Jules Horowitz, B.P. 156, 38042 Grenoble Cedex, France. E-mail: [email protected]

Abstract: Calculations are presented for backscattering spectrometers under consideration for the ESS. In particular, novel instrumentation concepts such as pulse-shaping choppers and ballistic guides are considered. Instruments covering energy resolutions from 1 to 10 µeV are presented and their expected performance at the ESS is compared to existing instruments. For µeV energy resolutions, the combination of a coupled moderator and a pulse-shaping chopper is shown to perform well compared to the conventional poisoned-moderator instrument.

Keywords: Neutron scattering instrumentation, Time-of-flight, Backscattering, Ballistic guides, Pulse-shaping

DOI: 10.1080/1023816021000020635

Journal: Journal of Neutron Research, vol. 10, no. 3, 4, pp. 179-186, 2002