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Neutron guide shiel...
Neutron guide shielding for the BIFROST spectrometer at ESS
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- Mantulnikovs, K. (författare)
- Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, Copenhagen, Denmark.,University of Copenhagen
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- Bertelsen, M. (författare)
- Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, Copenhagen, Denmark.,University of Copenhagen
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- Cooper-Jensen, Carsten P. (författare)
- Uppsala University,Lund University,Lunds universitet,Uppsala universitet,Materialfysik,European Spallat Source ESS AB, Lund, Sweden.,European Spallation Source ESS AB,Stiftelser och övriga anknutna verksamheter,Other Institutions and Utilities
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- Lefmann, K. (författare)
- Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, Copenhagen, Denmark.,University of Copenhagen
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- Klinkby, E. B. (författare)
- European Spallat Source ESS AB, Lund, Sweden.;Tech Univ Denmark, Ctr Nucl Technol, Lyngby, Denmark.,Technical University of Denmark,European Spallation Source ESS AB
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Univ Copenhagen, Niels Bohr Inst, Nanosci Ctr, Copenhagen, Denmark University of Copenhagen (creator_code:org_t)
- 2016-10-10
- 2016
- Engelska.
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Ingår i: VI European Conference On Neutron Scattering (ECNS2015). - : IOP Publishing. ; 746:1
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://iopscience.i...
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http://dx.doi.org/10... (free)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- We report on the study of fast-neutron background for the BIFROST spectrometer at ESS. We investigate the effect of background radiation induced by the interaction of fast neutrons from the source with the material of the neutron guide and devise a reasonable fast, thermal/cold neutron shielding solution for the current guide geometry using McStas and MCNPX. We investigate the effectiveness of the steel shielding around the guide by running simulations with three different steel thicknesses. The same approach is used to study the efficiencies of the steel wall a flat cylinder pierced by the guide in the middle and the polyethylene layer. The final model presented here has a 3 cm thick steel shielding around the guide, 30 cm of polyethylene around the shielding, two 5 mm thick B4C layers and a steel wall at position Z = 38 m, being 1 m thick and 10 m in radius. The final model finally proves that it is sufficient to bring the background level below the cosmic neutron rate, which defines an order of magnitude of the lowest obtainable background in the instruments.
Ämnesord
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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