Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2018 Nov 1;25(Pt 6):1611-1618.
doi: 10.1107/S1600577518012110. Epub 2018 Sep 26.

The HEPS project

Yi Jiao  1 , Gang Xu  1 , Xiao Hao Cui  1 , Zhe Duan  1 , Yuan Yuan Guo  1 , Ping He  1 , Da Heng Ji  1 , Jing Yi Li  1 , Xiao Yu Li  1 , Cai Meng  1 , Yue Mei Peng  1 , Sai Ke Tian  1 , Jiu Qing Wang  1 , Na Wang  1 , Yuan Yuan Wei  1 , Hai Sheng Xu  1 , Fang Yan  1 , Cheng Hui Yu  1 , Ya Liang Zhao  1 , Qing Qin  1
Affiliations

The HEPS project

Yi Jiao et al. J Synchrotron Radiat. .

Abstract

The High Energy Photon Source (HEPS), a 6 GeV green-field diffraction-limited storage ring light source, will be built in Beijing, China. The HEPS design has been evolving for about ten years, and is now mostly finished and ready for construction. The storage ring is based on a modified hybrid seven-bend achromat (7BA) design, where bending magnets with reverse bending angles and longitudinal gradients are adopted to reach an ultralow natural emittance of 34.2 pm with a circumference of 1360.4 m. The central slice of the dipole in the middle of the modified hybrid 7BA, with flexible magnetic field, is used as the source of the bending-magnet beamline. Moreover, alternating high- and low-beta sections are specially designed to generate and deliver X-ray synchrotron radiation with high brightness of 5 × 1022 photons s-1 mm-2 mrad-2 (0.1% bandwidth)-1. Here, the HEPS storage ring design and solutions to the challenges inherent in this ultralow-emittance design are presented.

Keywords: High Energy Photon Source (HEPS); diffraction-limited storage ring; modified hybrid seven-bend achromat.

PubMed Disclaimer

Figures

Figure 1
Figure 1
Schematic layout of the HEPS project
Figure 2
Figure 2
The available spectral brightness for HEPS operated in the high-brightness mode, evaluated by taking the intrabeam scattering effect, impedance and harmonic cavity into account.
Figure 3
Figure 3
Optical functions and layout of one super-period of the HEPS storage ring. Each super-period comprises two modified hybrid 7BAs.
Figure 4
Figure 4
DA of the HEPS storage ring, for the bare lattice (black) and for the case with practical errors at different steps of the correction procedure (colored dots). The colored curve represents the 20th-percentile smallest DA among the random error seeds.
Figure 5
Figure 5
Local momentum acceptances (LMAs) of one super-period of the HEPS storage ring, for the case with only the bare lattice (black) and with practical errors (blue curves represent results with different error seeds and red represents the average LMA).
Figure 6
Figure 6
The whole process of filling a bunch in a storage ring.
Figure 7
Figure 7
Layout of the injection and extraction regions of the HEPS storage ring.
See this image and copyright information in PMC

References

    1. Abliz, M., Jaski, M., Xiao, A., Jain, A., Wienands, U., Cease, H., Borland, M., Decker, G. & Kerby, J. (2018). Nucl. Instrum. Methods Phys. Res. A, 886, 7–12.
    1. Borland, M., Sun, Y., Sajaev, V., Lindberg, R. R. & Berenc, T. (2016). Proceedings of the North American Particle Accelerator Conference (NAPAC2016), 9–14 October 2016, Chicago, IL, USA, pp. 877–880. WEP0B01.
    1. Duan, Z., Chen, J.-H., Guo, Y.-Y., Jiao, Y., Li, J.-Y., Peng, Y.-M., Wang, J.-Q., Wang, N., Xu, G. & Xu, H.-S. (2018a). Proceedings of the 9th International Particle Accelerator Conference (IPAC2018), 29 April–4 May 2018, Vancouver, BC, Canada, pp. 4178–4181. THPMF052.
    1. Duan, Z., Chen, J.-H., Jiao, Y., Peng, Y.-M., Wang, Q., Xu, G. & Zhang, P. (2016). Proceedings of the 58th ICFA Advanced Beam Dynamics Workshop on High Luminosity Circular e+e− Colliders (eeFACT2016), 24–27 October 2016, Daresbury, UK, pp. 85–89. TUT2H4.
    1. Duan, Z., Ji, D.-H. & Jiao, Y. (2018b). Proceedings of the 9th International Particle Accelerator Conference (IPAC2018), 29 April–4 May 2018, Vancouver, BC, Canada, pp. 4182–4185. THPMF053.