Detuning effect corrections using octupoles in diffraction-limited storage ring

Xuan Shouzhi; Tian Shunqiang; Liu Xinzhong; Gong Yihao; Mao Linglong

doi:10.11884/HPLPB202537.240387

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Xuan Shouzhi, Tian Shunqiang, Liu Xinzhong, et al. Detuning effect corrections using octupoles in diffraction-limited storage ring[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.240387

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Xuan Shouzhi, Tian Shunqiang, Liu Xinzhong, et al. Detuning effect corrections using octupoles in diffraction-limited storage ring[J]. High Power Laser and Particle Beams. doi: 10.11884/HPLPB202537.240387

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Detuning effect corrections using octupoles in diffraction-limited storage ring

doi: 10.11884/HPLPB202537.240387

1.
Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
2.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

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Author Bio:
Xuan Shouzhi, xuansz@sari.ac.cn
Corresponding author: Tian Shunqiang, tiansq@sari.ac.cn。
Received Date: 2024-11-17
Accepted Date: 2025-04-14
Rev Recd Date: 2025-06-11

Available Online: 2025-06-21

Abstract

Abstract

The next generation of synchrotron radiation light sources features extremely low emittance, enabling the generation of synchrotron radiation with significantly higher brilliance, which facilitates the exploration of matter at smaller scales. However, the extremely low emittance results in stronger sextupole magnet strengths, leading to high natural chromaticity. This necessitates the use of sextupole magnets to correct the natural chromaticity. For the Shanghai Synchrotron Radiation Facility Upgrade (SSRF-U), a lattice was designed for the storage ring that can achieve an ultra-low natural emittance of 72.2 pm·rad on the beam energy of 3.5 GeV. However, the significant detuning effects, led by high second-order resonant driving terms due to strong sextupoles, will degrade performance of the facility. To resolve this issue, installation of octupoles in the SSRF-U storage ring has been planned. This paper presents the study results about configuration choosing and optimization method for the octupoles. An optimal solution for the SSRF-U storage ring was obtained to effectively mitigate the amplitude-dependent tune shift and the second-order chromaticity, consequently leading an increased dynamic aperture (DA), momentum acceptance (MA), and reduced sensitivity to magnetic errors.
- Shanghai Synchrotron Radiation Facility Upgrade,
- octupole,
- amplitude-dependent tune shift,
- dynamic aperture,
- momentum aperture

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References(30)

References

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