Shielding considerations for ESS LoKI

Issue title: ICANS-XXIII, hosted by the Oak Ridge National Laboratory Neutron Sciences Directorate

Guest editors: Kenneth W. Herwig and Erik B. Iverson

Article type: Research Article

Authors: Náfrádi, Gábor^{a; *} | Orszulik, Anton^a | Cooper, Jacob^a | Hicks, Ben^a | Turner, David^a | Halcrow, William^a | Jackson, Andrew^b | Lilley, Steven^a

Affiliations: [a] ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom. E-mails: [email protected], [email protected], [email protected] | [b] European Spallation Source, SE-211 00 Lund, Sweden. E-mail: [email protected]

Correspondence: [*] Corresponding author. E-mail: [email protected].

Abstract: LoKI is a SANS instrument being built by STFC ISIS as an in-kind contribution to ESS. According to the recent schedule, LoKI, is one of the first three instruments of ESS that is going to contribute to early science from 2023. MCNP calculations were carried out to determine the required shielding around different sections of the instrument. For the geometry development, SuperMC/MCAM was used. Highlights from the neutronics calculations based on the most frequent classes of possible events are presented here. These include heavy shutter performance, collimator section shielding and detector tank shielding. Activation and background calculations are not detailed in this paper.

Keywords: ESS, LoKI, radiation shielding, MCNP

DOI: 10.3233/JNR-200152

Journal: Journal of Neutron Research, vol. 22, no. 2-3, pp. 119-129, 2020