Effects of ground movements on realistic guide models for the European Spallation Source

Asla Husgard, Martin A. Olsen, Rebekka Frøystad, Jonas P. Hyatt, Mads Bertelsen, Rasmus Toft-Petersen, Kim Lefmann*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We model the effect of ground movement, based on empirical experience, on the transport properties of long neutron guides by ray-tracing simulations. For a simple model, our results reproduce the large losses found by an earlier study, while for a more realistic engineering model of guide mounting, we find the losses to be significantly smaller. A detailed study of the guide for the cold neutron spectrometer BIFROST at the European Spallation Source shows that a realistic loss value is 7.0(5)% for wavelengths of 2.3-4.0 Å, the typical operational wavelength range of the instrument. This amount of loss does not call for mitigation by overillumination as suggested in the previous work. Our work serves to quantify the robustness of the transport properties of long neutron guides, in construction or planning at neutron facilities worldwide.
Original languageEnglish
Article number103501
JournalPhysical Review Accelerators and Beams
Volume23
Issue number10
Number of pages8
ISSN1098-4402
DOIs
Publication statusPublished - 2020

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