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Optimization of mod...
Optimization of moderators and beam extraction at the ESS
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- Andersen, Ken Holst (författare)
- Lund University,Lunds universitet,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities
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- Bertelsen, Mads (författare)
- Niels Bohr Institute
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- Zanini, Luca (författare)
- Lund University,Lunds universitet,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities
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- Klinkby, Esben Bryndt (författare)
- European Spallation Source ESS AB,Technical University of Denmark
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- Schönfeldt, Troels (författare)
- Technical University of Denmark
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- Bentley, Phillip Martin (författare)
- Lund University,Lunds universitet,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities
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- Saroun, Jan (författare)
- Nuclear Physics Institute of the Academy of Sciences, Czech Republic
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(creator_code:org_t)
- 2018
- 2018
- Engelska 18 s.
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Ingår i: Journal of Applied Crystallography. - 0021-8898. ; 51:2, s. 264-281
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A global approach coupling the moderator to the beam extraction system has been applied for the design optimization of the thermal and cold moderators of the European Spallation Source (ESS), which will be the brightest neutron source in the world for condensed-matter studies. The design is based on the recently developed high-brightness low-dimensional moderator concepts. Para-hydrogen is used for the cold neutron source, while thermal neutrons are provided by moderation in water. The overall moderation configuration was chosen in order to satisfy a range of requirements on bispectral extraction, beamport configuration and instrument performance. All instruments are served by a single moderator assembly above the target, arranged in a 'butterfly' geometry with a height of 3 cm. This was determined to be the optimal height for trade-off between high brightness and efficient guide illumination, by analysis of the performance of 23 instruments, based on the reference suite of the ESS Technical Design Report. The concept of 'brilliance transfer' is introduced to quantify the performance of the neutron optical system from the source to the sample. The target monolith incorporates a grid of 42 neutron beamports with an average separation of 6°, allowing a free choice between cold and thermal neutron sources at all instrument positions. With the large number of beamports and the space below the target available for future moderators, ample opportunities are available for future upgrades.
Ämnesord
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
Nyckelord
- brilliance transfer
- butterfly moderators
- low-dimensional moderators
- neutron instruments
- pancake moderators
- para-hydrogen moderators
- water moderators
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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