Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2018, Vol. 29 ›› Issue (8): 113 doi: 10.1007/s41365-018-0445-6


Bunch-by-bunch longitudinal phase monitor at SSRF

Yi-Mei Zhou 1,2 • Han-Jiao Chen 1,2 • Shan-Shan Cao 1,2 • Yong-Bin Leng 1,2   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 Shanghai Synchrotron Radiation Facility, Chinese Academy of Sciences, Shanghai 201204, China
  • Contact: Yong-Bin Leng
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (Nos. 11575282, 11375255).

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Yi-Mei Zhou, Han-Jiao Chen, Shan-Shan Cao, Yong-Bin Leng. Bunch-by-bunch longitudinal phase monitor at SSRF.Nuclear Science and Techniques, 2018, 29(8): 113     doi: 10.1007/s41365-018-0445-6


Beam signals captured from a button-type pickup contain multidimensional information including the bunch charge, transverse position, bunch length, and longitudinal phase. A bunch phase monitor, which retrieves longitudinal phase information from a pickup signal at a bunch-by-bunch rate, has been developed at the Shanghai Synchrotron Radiation Facility. This paper introduces the basic principles, system setup, data processing method, and preliminary experimental results of this system. The systematic measurement error introduced by the limited system bandwidth, bunch length, and bunch charge variation was studied using simulation data. The random measurement uncertainty was evaluated using experimental beam data. The experimental result shows that the longitudinal phase resolution of this system is better than 1.0 ps. The first application, measuring the relationship between the longitudinal phase and bunch charge to determine the energy loss factor, was implemented, and the preliminary result is also discussed.

Key words: Bunch-by-bunch, Longitudinal phase, Resolution, Pickup signal, Software resampling