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A design study of VOR: A versatile optimal resolution chopper spectrometer for the ESS
European Spallat Source ESS AB, S-22100 Lund, Sweden.
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design. European Spallat Source ESS AB, S-22100 Lund, Sweden.ORCID iD: 0000-0003-3221-2086
2015 (English)In: EPJ Web of Conferences, EDP Sciences, 2015, Vol. 83Conference paper, Published paper (Refereed)
Abstract [en]

VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the European Spallation Source (ESS), 30.2 m moderator to sample, and provides instantaneous access to a broad dynamic range, 1-120 meV within each ESS period. The short instrument length combined with the long ESS pulse width enables a quadratic flux increase, even at longer wavelengths, by relaxing energy resolution from ΔE/E = 1% up to ΔE/E = 7%. This is impossible both on a long chopper spectrometer at the ESS and with instruments at short pulsed sources. In comparison to current day chopper spectrometers, VOR can offer an order of magnitude improvement in flux for equivalent energy resolutions, ΔE/E = 1-3%. Further relaxing the energy resolution enables VOR to gain an extra order of magnitude in flux. In addition, VOR has been optimised for repetition rate multiplication (RRM) and is therefore able to measure, in a single ESS period, 6-14 incident wavelengths, across a wavelength band of 9 Å with a novel chopper configuration that transmits all incident wavelengths with equivalent counting statistics. The characteristics of VOR make it a unique instrument with capabilities to access small, limited-lifetime samples and transient phenomena with inelastic neutron scattering.

Place, publisher, year, edition, pages
EDP Sciences, 2015. Vol. 83
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-24604DOI: 10.1051/epjconf/20158303002ISI: 000351844900023Scopus ID: 2-s2.0-84921731934Local ID: STCOAI: oai:DiVA.org:miun-24604DiVA: diva2:849522
Conference
11th International Conference on Quasielastic Neutron Scattering, QENS 2014 and 6th International Workshop on Inelastic Neutron Spectrometers, WINS 2014, 11 May 2014 through 16 May 2014
Note

Export Date: 17 March 2015

Available from: 2015-08-28 Created: 2015-03-17 Last updated: 2016-12-23Bibliographically approved

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CiteExportLink to record
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Citation style
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