Open AccessThe HEPS project
Author(s) -
Jiao Yi,
Xu Gang,
Cui Xiao-Hao,
Duan Zhe,
Guo Yuan-Yuan,
He Ping,
Ji Da-Heng,
Li Jing-Yi,
Li Xiao-Yu,
Meng Cai,
Peng Yue-Mei,
Tian Sai-Ke,
Wang Jiu-Qing,
Wang Na,
Wei Yuan-Yuan,
Xu Hai-Sheng,
Yan Fang,
Yu Cheng-Hui,
Zhao Ya-Liang,
Qin Qing
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577518012110
Subject(s) - storage ring , beamline , thermal emittance , beam emittance , synchrotron radiation , advanced photon source , optics , brightness , magnet , physics , dipole , synchrotron radiation source , beam (structure) , synchrotron , materials science , quantum mechanics
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 × 10 22 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.