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Experimental characterization of a prototype secondary spectrometer for vertically scattering multiple energy analysis at cold-neutron triple axis spectrometers

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Toft-Petersen Rasmus, Groitl Felix, Kure Mathias, Lim Joshua, Cermak Petr, Alimov Svyatoslav, Wilpert Thomas, Quintero-Castro Diana, Niedermayer Christof, Schneidewind Astrid, Habicht Klaus,
Project High efficiency neutron spectrometer optimized for investigations under extreme conditions
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Original article (peer-reviewed)

Journal NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume (Issue) 830
Page(s) 338 - 344
Title of proceedings NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
DOI 10.1016/j.nima.2016.06.004

Open Access

URL https://infoscience.epfl.ch/record/222089
Type of Open Access Repository (Green Open Access)

Abstract

A thorough experimental characterization of a multiplexing backend with multiple energy analysis on a cold-neutron triple axis spectrometer (cTAS) is presented. The prototype employs two angular segments (2 theta-segments) each containing five vertically scattering analyzers (energy channels), which simultaneously probe an energy transfer range of 2 meV at the corresponding two scattering angles. The feasibility and strength of such a vertically scattering multiple energy analysis setup is clearly demonstrated. It is shown, that the energy resolution near the elastic line is comparable to the energy resolution of a standard cTAS. The dispersion relation of the antiferromagnetic excitations in MnF2 has been mapped out by performing constant energy transfer maps. These results show that the tested setup is virtually spurion free. In addition, focusing effects due to (mis)matching of the instrumental resolution ellipsoid to the excitation branch are clearly evident.
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