0488806 - ÚJF 2019 RIV NL eng J - Journal Article
Rouijaa, M. - Kampmann, R. - Šaroun, Jan - Fenske, J. - Beran, Přemysl - Muller, M. - Lukáš, Petr - Schreyer, A.
Beam modulation: A novel ToF-technique for high resolution diffraction at the Beamline for European Materials Engineering Research (BEER).
Nuclear Instruments & Methods in Physics Research Section A. Roč. 889, č. 5 (2018), s. 7-15. ISSN 0168-9002. E-ISSN 1872-9576
R&D Projects: GA MŠMT LM2015048
Institutional support: RVO:61389005
Keywords : Time-of-flight diffractometer * strain scanner * residual stress
OECD category: Nuclear related engineering
Impact factor: 1.433, year: 2018 ; AIS: 0.384, rok: 2018
DOI: https://doi.org/10.1016/j.nima.2017.12.083

The Beamline for European Materials Engineering Research (BEER) is under construction at the European Spallation Source (ESS) in Lund, Sweden. A basic requirement on BEER is to make best use of the long ESS pulse (2.86 ms) for engineering investigations. High-resolution diffraction, however, demands timing resolution up to 0.1% corresponding to a pulse length down to about 70 mu s for the case of thermal neutrons (lambda similar to 1.8 angstrom). Such timing resolution can be achieved by pulse shaping techniques cutting a short section out of the long pulse, and thus paying for resolution by strong loss of intensity. In contrast to this, BEER proposes a novel operation mode called pulse modulation technique based on a new chopper design, which extracts several short pulses out of the long ESS pulse, and hence leads to a remarkable gain of intensity compared to nowadays existing conventional pulse shaping techniques. The potential of the new technique can be used with full advantage for investigating strains and textures of highly symmetric materials. Due to its instrument design and the high brilliance of the ESS pulse, BEER is expected to become the European flagship for engineering research for strain mapping and texture analysis.
Permanent Link: http://hdl.handle.net/11104/0283342