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Systematic neutron guide misalignment for an accelerator-driven spallation neutron source
European Spallat Source ESS AB, Box 176, S-22100 Lund, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. European Spallat Source ESS AB, Box 176, S-22100 Lund, Sweden..
2016 (English)In: PHYSICAL REVIEW ACCELERATORS AND BEAMS, ISSN 2469-9888, Vol. 19, no 8Article in journal (Refereed) Published
Abstract [en]

The European SpaRation Source (ESS) is a long pulse spallation neutron source that is currently under construction in Lund, Sweden. A considerable fraction of the 22 planned instruments extend as far as 75-150 m from the source. In such long beam lines, misalignment between neutron guide segments can decrease the neutron transmission significantly. In addition to a random misalignment from installation tolerances, the ground on which ESS is built can be expected to sink with time, and thus shift the neutron guide segments further away from the ideal alignment axis in a systematic way. These systematic errors are correlated to the ground structure, position of buildings and shielding installation. Since the largest deformation is expected close to the target, even short instruments might be noticeably affected. In this study, the effect of this systematic misalignment on short and long ESS beam lines is analyzed, and a possible mitigation by overillumination of subsequent guide sections investigated.

Place, publisher, year, edition, pages
2016. Vol. 19, no 8
National Category
Accelerator Physics and Instrumentation
Identifiers
URN: urn:nbn:se:uu:diva-303057DOI: 10.1103/PhysRevaccelbeams.19.083501ISI: 000381723100003OAI: oai:DiVA.org:uu-303057DiVA: diva2:970690
Available from: 2016-09-14 Created: 2016-09-14 Last updated: 2016-09-14Bibliographically approved

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Bentley, Phillip M.
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Materials Physics
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