Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources

Shen Siqi; Tian Shunqiang; Zhang Qinglei; Wu Xu; Zhao Zhentang

doi:10.11884/HPLPB201931.190196

Volume 31 Issue 12

Dec. 2019

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Article Navigation > High Power Laser and Particle Beams > 2019 > 31(12): 125101

Shen Siqi, Tian Shunqiang, Zhang Qinglei, et al. Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources[J]. High Power Laser and Particle Beams, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196

Citation:

Shen Siqi, Tian Shunqiang, Zhang Qinglei, et al. Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources[J]. High Power Laser and Particle Beams, 2019, 31: 125101. doi: 10.11884/HPLPB201931.190196

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Nonlinear optimization for longitudinal beam injection in diffraction-limited synchrotron light sources

doi: 10.11884/HPLPB201931.190196

Shen Siqi^{1, 2
,},
Tian Shunqiang³,
Zhang Qinglei³,
Wu Xu^{1, 2, 3},
Zhao Zhentang^{1, 3}

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

More Information

Author Bio:
Shen Siqi (1991—), male, PhD student, majors in accelerator physics; shensiqi@sinap.ac.cn
Received Date: 2019-06-03
Rev Recd Date: 2019-09-07
Publish Date: 2019-12-01

Abstract

Abstract

Storage rings of the next generation synchrotron light sources have quite small dynamic apertures with which transverse beam injection can hardly be efficient. The longitudinal beam injection may be a solution to this problem. To apply a longer kicker pulse, it is necessary to increase time offset of the injected beam to the stored one by reducing RF frequency. The beam with a longer time offset will have a higher momentum deviation due to synchrotron motion, thus full injection of this method requires the storage ring to provide large enough energy acceptance and off-momentum dynamic aperture. A candidate lattice of the upgraded Shanghai Synchrotron Radiation Facility (SSRF-U) was used to nonlinearly optimize the longitudinal beam injection. With the optimal results of a series of RF frequencies, it is found that there is a critical RF frequency below which lowering frequency could not help to lengthen the kicker pulse in a given lattice. The beam injection into the SSRF-U storage ring was simulated and reached high efficiency with its critical RF frequency and optimal sextupole gradients.
- longitudinal beam injection,
- nonlinear optimization,
- dynamic aperture,
- synchrotron phase space,
- diffraction-limited synchrotron light source

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References(25)

References

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