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Design and fabrication of button-style beam position monitors for the HEPS synchrotron light facility

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Abstract

At the High Energy Photon Source (HEPS), a high orbital stability of typically 10% of the beam size and angular divergence must be achieved. The beam size at the insertion devices is 10 μm horizontally and 1 μm vertically, which implies that the beam orbit must be stabilized to the sub-micrometer level. This results in stringent tolerance and quality control requirements for the series production of beam position monitor (BPM) pickups. In this study, analytical formulas were used and CST simulations were performed to analyze the effects of the mechanical tolerances of BPM pickups on beam position measurement. The results of electromagnetic field simulations revealed how various mechanical errors, such as button size and location accuracy, as well as the related button capacitance, exert different influences on the beam position measurement. The performance of an actual BPM pickup was measured, along with an assessment of the error on the beam position measurement. Additionally, a wakefield analysis, including an investigation of trapped resonant modes and related thermal deformation, was conducted.

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Acknowledgements

The authors thank Dr. Ren-Xian Yuan at the Shanghai Advanced Research Institute for their help in the development of the feedthroughs. The authors thank Dr. Zhe Duan, Da-Heng Ji, Sai-Ke Tian and Ou-Zheng Xiao for their helpful discussions and Xu-Jian Wang for help with BPM manufacturing.

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Authors and Affiliations

  1. Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China

    Jun He, Yan-Feng Sui, Yong Li, Xu-Hui Tang, Lin Wang, Fang Liu, Zhi Liu, Ling-Da Yu, Xiao-Yu Liu, Tao-Guang Xu, Jian-She Cao & Jun-Hui Yue

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yan-Feng Sui, Yong Li, Xu-Hui Tang & Jian-She Cao

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  1. Jun He
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  2. Yan-Feng Sui
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  12. Jun-Hui Yue
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Corresponding authors

Correspondence to Jun He or Jun-Hui Yue.

Additional information

This work was supported by the Youth Innovation Promotion Association CAS (Nos. 2019013 and Y202005) and the National Natural Science Foundation of China (No. 11975254).

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He, J., Sui, YF., Li, Y. et al. Design and fabrication of button-style beam position monitors for the HEPS synchrotron light facility. NUCL SCI TECH 33, 141 (2022). https://doi.org/10.1007/s41365-022-01126-7

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