Optimized superconducting coils for a high-resolution neutron spin-echo spectrometer at the European Spallation Source

Pasini, S.; Monkenbusch, M.

doi:10.1088/0957-0233/26/3/035501

Journal Article

FZJ-2015-01086

Optimized superconducting coils for a high-resolution neutron spin-echo spectrometer at the European Spallation Source

Pasini, S. (Corresponding Author)FZJ* ; Monkenbusch, M.FZJ*

2015
IOP Publ. Bristol

Measurement science and technology 26(3), 035501 (2015) [10.1088/0957-0233/26/3/035501]

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Please use a persistent id in citations: doi:10.1088/0957-0233/26/3/035501

Abstract: The ultimate energy resolution in inelastic thermal neutron scattering spectroscopy is provided by neutron spin echo (NSE) spectrometers. The characteristic of a NSE spectrometer is that it detects neutron-velocity changes by spin-coding. It measures the intermediate scattering function I(Q, t) in terms of final beam polarisation. High resolution in that case means the extension of the Fourier time (t) range towards 1 µs. The most important technical limitation to increase the resolution of NSE spectrometers results from the need to equalize the field integrals that determine the coding spin-precession angles along different neutron paths by combining a suitable precession field with correction coils. Here we report on the field shape optimisation and design of precession magnetic coil arrangements with minimal intrinsic field integral inhomogeneity for a wide and diverging neutron beam with a new semi-analytical approach and a numerical method. This minimizes the amount of additionally required correction. The solenoid configuration we found fulfils all the conditions required by a real NSE spectrometer.

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