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Wavelength frame multiplication for reflectometry at long-pulse neutron sources

DOI: 10.1063/5.0014207 DOI Help

Authors: Oliver Löhmann (Technische Universität Darmstadt; European Spallation Source ESS ERIC) , Luca Silvi (Helmholtz-Zentrum Berlin für Materialien und Energie) , Peter M. Kadletz (European Spallation Source ESS ERIC) , Neil Vaytet (European Spallation Source ESS ERIC) , Owen Arnold (STFC; Tessella) , Matthew D. Jones (STFC; Tessella) , Jonas Nilsson (European Spallation Source ESS ERIC) , Michael Hart (STFC) , Tobias Richter (European Spallation Source ESS ERIC) , Regine Von Klitzing (Technische Universität Darmstadt) , Andrew J. Jackson (European Spallation Source ESS ERIC; Lund University) , Thomas Arnold (European Spallation Source ESS ERIC; STFC; Diamond Light Source; University of Bath) , Robin Woracek (European Spallation Source ESS ERIC)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Review Of Scientific Instruments , VOL 91

State: Published (Approved)
Published: December 2020

Open Access Open Access

Abstract: The European Spallation Source (ESS), which is under construction in Lund (Sweden), will be the next leading neutron facility with an unprecedented brilliance and novel long-pulse time structure. A long-pulse source not only provides a high time-average flux but also opens the possibility to tune the resolution by using pulse shaping choppers. Thus, an instrument can readily be operated in either a high flux or a high resolution mode. Several of the shorter instruments at the ESS will employ Wavelength Frame Multiplication (WFM) in order to enable a sufficient resolution while offering a continuous and broad wavelength range. A test beamline was operated until the end of 2019 at the research reactor in Berlin to test components and methods, including WFM, in order to prepare the new facility for the operation of neutron instruments and successful first science. We herein demonstrate the implementation of WFM for reflectometry. By selecting a short pulse mode under the same geometrical configuration, we compare and discuss the results for two reference samples. The reported experiments not only serve to prove the reliability of the WFM approach but also, for the first time, demonstrate the full instrument control, data acquisition and data reduction chain that will be implemented at the ESS.

Journal Keywords: Scattering theory; Neutron sources; Sample handling; Computational methods; Neutron scattering; Data analysis; Reflectometry; Data acquisition; Fission reactors

Subject Areas: Physics

Facility: Helmholtz-Zentrum Berlin für Materialien und Energie