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Optimization of Performance, Price, and Background of Long Neutron Guides for European Spallation Source

1
Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
2
Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
3
European Spallation Source ERIC, Data Management and Software Center, Ole Maaløes Vej 3, 2200 Copenhagen N, Denmark
4
Danish Technological Institute, Gregersensvej 1, DK-2630 Taastrup, Denmark
*
Author to whom correspondence should be addressed.
Current address: ISIS Neutron and Muon Source, STFC, Rutherford Appleton Laboratory, Harwell, Oxfordshire, Didcot OX11 0QX, UK.
Quantum Beam Sci. 2019, 3(3), 16; https://doi.org/10.3390/qubs3030016
Received: 14 June 2019 / Revised: 10 July 2019 / Accepted: 15 July 2019 / Published: 18 July 2019
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Abstract

We describe a systematic approach for the design of long, ballistic cold, and thermal neutron guides for the European Spallation Source (ESS). The guides investigated in this work are 170 m long and are required to have a narrowing point with room for a pulse shaping chopper placed 6 m from the moderator. In addition, most guides avoid line-of-sight from the moderator to the sample. The guides are optimized in order to find a reasonable trade-off between neutronics performance and construction price. The geometries simulated are closely related to the thermal-neutron multi-length-scale diffractometer HEIMDAL and the cold-neutron multi-analyser spectrometer BIFROST. For the cold-neutron guide an inexpensive solution was found that maintains good transport properties, while avoiding line-of-sight. However, for the thermal-neutron guide the losses when avoiding line-of-sight are large and it seems a good choice to stay in line-of-sight, even though this will increase both the shielding costs and fast-neutron background. The results are of general relevance for the understanding of the relation between transport, background, and price of long neutron guides. View Full-Text
Keywords: ESS; McStas; neutron ray-tracing simulation; neutron guide system ESS; McStas; neutron ray-tracing simulation; neutron guide system
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Holm-Dahlin, S.; Olsen, M.A.; Bertelsen, M.; Birk, J.O.; Lefmann, K. Optimization of Performance, Price, and Background of Long Neutron Guides for European Spallation Source. Quantum Beam Sci. 2019, 3, 16.

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