Low-loss design for the high-intensity accumulator ring of the Spallation Neutron Source

This paper summarizes the low-loss design for the Spallation Neutron Source accumulator ring [“Spallation Neutron Source Design Manual” (unpublished)]. A hybrid lattice consisting of FODO arcs and doublet straights provides optimum matching and flexibility for injection and collimation. For this lat...

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Bibliographic Details
Published in:Physical review special topics. PRST-AB. Accelerators and beams 2000-08, Vol.3 (8), p.080101, Article 080101
Main Authors: Wei, J., Abell, D. T., Beebe-Wang, J., Blaskiewicz, M., Cameron, P. R., Catalan-Lasheras, N., Danby, G., Fedotov, A. V., Gardner, C., Jackson, J., Lee, Y. Y., Ludewig, H., Malitsky, N., Meng, W., Papaphilippou, Y., Raparia, D., Tsoupas, N., Weng, W. T., Witkover, R. L., Zhang, S. Y.
Format: Article
Language:English
Subjects:
Accumulators
Collimation
Control stability
Design optimization
Neutrons
Spallation
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Summary:This paper summarizes the low-loss design for the Spallation Neutron Source accumulator ring [“Spallation Neutron Source Design Manual” (unpublished)]. A hybrid lattice consisting of FODO arcs and doublet straights provides optimum matching and flexibility for injection and collimation. For this lattice, optimization focuses on six design goals: a space-charge tune shift low enough (below 0.15) to avoid strong resonances, adequate transverse and momentum acceptance for efficient beam collimation, injection optimized for desired target beam shape and minimal halo development, compensation of magnet field errors, control of impedance and instability, and prevention against accidental system malfunction. With an expected collimation efficiency of more than 90%, the uncontrolled fractional beam loss is expected to be at the 10−4 level.
ISSN:1098-4402
1098-4402
2469-9888
DOI:10.1103/PhysRevSTAB.3.080101