Modification and optimization of the storage ring lattice of the High Energy Photon Source

Jiao, Yi; Chen, Fusan; He, Ping; Li, Chunhua; Li, Jingyi; Qin, Qing; Qu, Huamin; Wan, Jinyu; Wang, JQ; Xu, Gang

doi:10.1007/s41605-020-00189-7

Cited by 32 publications

(10 citation statements)

References 24 publications

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“…The HEPS is a 4GLS being built in China [41]. The storage ring of the HEPS is designed to store ultra-low-emittance electron beam [42,43], so as to deliver photon beams of much higher quality than its predecessors and serve tens of users at the same time. The HEPS storage ring comprises 48 seven-bend-achromats that are grouped in 24 super-periods, with a circumference of 1360.4 m and a natural emittance of ∼34 pm.…”

Section: Application To Da Evaluation For a Diffraction-limited Stora...mentioning

confidence: 99%

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Wan

Jiao

2022

New J. Phys.

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For any storage ring-based large-scale scientific facility, one of the most important performance parameters is the dynamic aperture (DA), which measures the motion stability of charged particles in a global manner. To date, long-term tracking-based simulation is regarded as the most reliable method to calculate DA. However, numerical tracking may become a significant issue, especially when a plethora of candidate designs of a storage ring need to be evaluated. In this paper, we present a novel machine learning-based method, which can reduce the computation cost of DA tracking by approximately one order of magnitude, while keeping sufficiently high evaluation accuracy. Moreover, we demonstrate that this method is independent of concrete physical models of a storage ring. This method has the potential to be applied to similar problems of identifying irregular motions in other complex dynamical systems.

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Section: Application To Da Evaluation For a Diffraction-limited Stora...mentioning

confidence: 99%

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Wan

Jiao

2022

New J. Phys.

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“…To determine the parameters of the pre-kicker system, the beam motion after the pre-kick was simulated using the elegant code [17,18]. The simulations were based on the latest V3.1 lattice [19] of the HEPS storage ring. Fifty imperfect lattice seeds were available for realistic simulations.…”

Section: Parameter Choices Of the Pre-kicker Systemmentioning

confidence: 99%

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

et al. 2021

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The High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. The swap-out injection is adopted with the depleted bunch recycled via high-energy accumulation in the booster. The extremely high beam energy density of the bunches with an ultra-low emittance (about 30 pm horizontally and 3 pm vertically) and high bunch charges (from 1.33 to 14.4 nC) extracted from the storage ring could cause hazardous damage to the extraction Lambertson magnet in case of extraction kicker failure. To this end, we proposed the use of a pre-kicker to spoil the bunches prior to extraction, significantly reducing the maximum beam energy density down to within a safe region while still maintaining highly efficient extractions. The main parameters of the pre-kicker are simulated and discussed.

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“…The High Energy Photon Source (HEPS) [1,2], which is under construction in Beijing, is the first fourth-generation synchrotron light source in China. The goal of the HEPS project [2] is to build a high-performance high-energy synchrotron light source with 6 GeV beam energy, 200 mA beam current, and the horizontal natural emittance lower The latest baseline designs (labeled as V3.0) of the LINAC [4], the booster [5], the beam transfer lines [6], and the storage ring [7] were given in 2020. Based on these baseline lattices, the designs and optimizations of many types of hardware (see, e.g., [8][9][10][11][12]) and detailed physics studies [3,[13][14][15][16][17][18][19][20] were carried out and basically finished.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium electron beam parameters of the High Energy Photon Source

Meng

Peng

et al. 2023

Radiat Detect Technol Methods

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Purpose The physics design of the High Energy Photon Source (HEPS) was finished after many times of iteration. Hereby, the typical equilibrium electron beam parameters corresponding to the proposed two baseline operation modes in the baseline design of HEPS are presented. Methods To compute the equilibrium parameters of the electron beam, the lattice parameters, RF parameters, and the parameters of the insertion devices (IDs) were determined first. Furthermore, it is more precise to use the full-current electron beam parameters in the estimations of the performance of the synchrotron light. Therefore, not only the single-particle dynamics but also the current-dependent collective effects need to be considered in the computations of the full-current, equilibrium parameters of the electron beam. Both analytic computations and multi-particle tracking simulations were carried out. Results The full-current, equilibrium parameters of the electron beams in the HEPS storage ring are presented in this paper. Moreover, the main beam parameters in the injector (the booster and the LINAC), corresponding to the two baseline operation modes of the storage ring, are also presented. Conclusion The typical electron beam parameters corresponding to the two baseline operation modes are given in detail in this paper.

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Modification and optimization of the storage ring lattice of the High Energy Photon Source

Cited by 32 publications

References 24 publications

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Machine learning enabled fast evaluation of dynamic aperture for storage ring accelerators

Using a pre-kicker to ensure safe extractions from the HEPS storage ring

Equilibrium electron beam parameters of the High Energy Photon Source

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