Magnetic Designs of New First Target Beamline Magnets for the ORNL SNS Upgrade

Journal Article · 23 February 2022 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/TASC.2022.3153439 · OSTI ID:1856011

Kashikhin, V.  ^[1]; Amann, J. ^[1]; Evans, N. ^[2]; Harding, D.  ^[1]; Holmes, J. ^[2]; Plum, M.  ^[2]; Pomella, D. ^[2]

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1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The Spallation Neutron Source (SNS) at ORNL currently is being upgraded from 1.0 GeV to 1.3 GeV. Several water-cooled magnets should be upgraded to transport 30% of higher beam energy. New chicane, injection/extraction septum, and Lambertson magnets were designed. Designing the magnets was a challenging task because the new magnets required good combined integrated field quality and needed to occupy the old magnets space but with about 20% greater integrated magnetic field. Additional strong requirements applied to the magnets fringe field do not disturb the circulating beam. The special field profiles had to be provided in foil areas between magnets. The analysis described here was based on OPERA3D simulations. A special technique was used for analyzing the integrated field harmonics. Initially, the particle track was simulated, and integrated field components were calculated along this track for the reference radius, which were used for the harmonics analysis. In addition, 3D field maps were provided for beam optics simulations. The final beamline analysis confirmed good beam transmission and low losses.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1856011
• Report Number(s): FERMILAB-CONF-22-068-TD; THU-PO3-117-07; oai:inspirehep.net:2056663
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 6 Vol. 32; ISSN 1051-8223
• Publisher: IEEECopyright Statement
• Country of Publication: United States
• Language: English