Impedance of in-air undulator vacuum chamber in HEPS

被引：0
|
作者：
Li, Jintao [1 ,2 ]
Wang, Na [1 ]
Yue, Sen [1 ,2 ]
Tian, Saike [1 ]
机构：
[1] Chinese Acad Sci, Inst High Energy Phys, 19B Yuquan Rd, Beijing, Peoples R China
[2] Univ Chinese Acad Sci, 1 Yanqihu East Rd, Beijing, Peoples R China
来源：
JOURNAL OF INSTRUMENTATION | 2023年 / 18卷 / 12期
基金：
中国国家自然科学基金;
关键词：
Acceleration cavities and superconducting magnets (high-temperature superconductor; radiation hardened magnets; normal-conducting; permanent magnet devices; wigglers and undula-tors); Instrumentation for particle accelerators and storage rings-high energy (linear accelerators; synchrotrons); Coherent instabilities;
D O I：
10.1088/1748-0221/18/12/P12003
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Undulators with small gap have been widely used in various light sources all over the world for the demand of high brilliance. A large number of in-air undulators with small gap will be installed in the storage ring of the High Energy Photon Source, and become one of the important impedance contributors. Antechambers are adopted for the bypass of the synchrotron radiations, as well as to reach high vacuum in the beam pipe with small aperture. Due to the asymmetric structure of the vacuum chamber, monopole wakefield in the transverse planes will be excited by the beam passage. In addition, photon absorbers will be installed in the vacuum chamber of the in-air undulators to shield the downstream components, which will introduce extra resonances in the transverse planes. In this paper, a series of numerical simulations are performed to investigate the impedance of the in-air undulator vacuum chamber. The high order modes generated by the photon absorber and their mitigations are also investigated.
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页数：14
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