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

Nanoscience Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen Ø, Denmark
Department of Chemistry, University of Aarhus, DK-8000 Aarhus C, Denmark
European Spallation Source ERIC, Data Management and Software Center, Ole Maaløes Vej 3, 2200 Copenhagen N, Denmark
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;
Received: 14 June 2019 / Revised: 10 July 2019 / Accepted: 15 July 2019 / Published: 18 July 2019
PDF [2915 KB, uploaded 18 July 2019]
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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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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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