A Cross-Cell Interleaved Nonlinear Lattice for Potential NSLS-II Upgrade

An interleaved sextupole scheme using a cross-cell betatron phase cancellation technique is adopted as a candidate for a future upgrade to the NSLS-II lattice. The upgraded lattice will use as many NSLS-II installed magnets as possible, including 30 dipoles, which will create a triple bend achromat...

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Bibliographic Details
Published in:Journal of physics. Conference series 2019-11, Vol.1350 (1), p.12119
Main Authors: Li, Yongjun, He, An, Shaftan, Timur, Smaluk, Victor, Kosciuk, Bernard, Bai, Zhenghe, Wang, Lin
Format: Article
Language:English
Subjects:
Bends
Configurations
Damping
Dipoles
Emittance
Light sources
Magnets
PARTICLE ACCELERATORS
Physics
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Summary:An interleaved sextupole scheme using a cross-cell betatron phase cancellation technique is adopted as a candidate for a future upgrade to the NSLS-II lattice. The upgraded lattice will use as many NSLS-II installed magnets as possible, including 30 dipoles, which will create a triple bend achromat configuration. A 300 pm-rad horizontal beam emittance has already been achieved with the current configuration. The emittance can be further reduced to around 200 pm-rad with damping wigglers. Some new design concepts used in modern 4th-generation light sources, such as adopting longitudinal gradient bends and reverse bends, are incorporated into the design as well. The betatron phase-advance between sextupoles is designed to have a cross-cell interleaved cancellation pattern in the transverse planes. The dynamic aperture is sufficient to allow the conventional off-axis top-off injection. At the same time, a large energy acceptance looks promising and would ensure a sufficiently long beam lifetime.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1350/1/012119