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 (10): 148 doi: 10.1007/s41365-018-0477-y


Performance of beam size monitor based on Kirkpatrick–Baez mirror at SSRF

De-Chong Zhu 1,2 • Jun-Hui Yue 1 • Yan-Feng Sui 1,2 • Da-Heng Ji 1 • Jian-She Cao 1 • Kai-Rong Ye 3 • Shun-Qiang Tian 3 • Jie Chen 3 • Yong-Bin Leng 3   

  1. 1 Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    2 University of Chinese Academy of Sciences, Beijing 100049, China
    3 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Contact: Jian-She Cao
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De-Chong Zhu, Jun-Hui Yue, Yan-Feng Sui, Da-Heng Ji, Jian-She Cao, Kai-Rong Ye, Shun-Qiang Tian, Jie Chen, Yong-Bin Leng. Performance of beam size monitor based on Kirkpatrick–Baez mirror at SSRF.Nuclear Science and Techniques, 2018, 29(10): 148     doi: 10.1007/s41365-018-0477-y


High-energy photon source (HEPS) is a 6 GeV ultralow emittance storage ring light source to be built in Beijing, China. Both the horizontal and vertical beam sizes of the HEPS storage ring are below 10 lm. It is a challenge to measure such a small beam size in both directions. To this end, measurement by a Kirkpatrick–Baez (KB) mirror imaging system was evaluated. A test KB system for the Shanghai Synchrotron Radiation Facility storage ring was designed and tested. Two crossed cylindrical mirrors were used to image the dipole source point. Both mirrors can be moved in and out so that the monitor is interchangeable with the original X-ray pinhole monitor. The aberration and point spread function, which would cause image blur, were evaluated. A beam-based calibration scheme was used by varying the beam size with different quadrupole settings and fitting them with the corresponding theoretical values. We updated the original X-ray camera with a new camera having a 5-lm-thick LuAG/Ce scintillator, and the imaging result shows greatly decreased image blur.

Key words: KB mirror, Beam size measurement, Beam diagnostic, Emittance, Synchrotron radiation