Research on the comprehensive performance of PrFeB magnets for synchrotron radiation and free electron laser

  • Yong-Zhou HeEmail author
  • Xiao-Qing Bao
  • Wei Zhang
  • Qiao-Gen Zhou


PrFeB magnets, which possess excellent magnetic properties at low temperatures, have important application value as cryogenic permanent magnet undulators for synchrotron radiation sources and free electron lasers. In this research study, several high-performance PrFeB magnets (P42H, P48SH, and P48UH) were prepared, and their performance was comprehensively examined, including evaluations of their magnetic properties, microstructures, uniformity, and stability. Next, their application prospects were analyzed and discussed. In China, the first cryogenic permanent magnet undulators (CPMUs) with P48SH magnets with 18 mm cycle lengths have been developed. When the temperature is 80 K and the gap is 6.0 mm, the magnetic field measurement results of the CPMU showed that the effective magnetic field peak was approximately 0.92 T, yielding an increase of 11.76% relative to operation at 300 K, with an RMS phase error of about 4.99°.


PrFeB magnets Cryogenic permanent magnet undulators Grain boundary diffusion method Free electron laser 


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Copyright information

© China Science Publishing & Media Ltd. (Science Press), Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Chinese Nuclear Society and Springer Nature Singapore Pte Ltd. 2019

Authors and Affiliations

  • Yong-Zhou He
    • 1
    Email author
  • Xiao-Qing Bao
    • 2
  • Wei Zhang
    • 1
  • Qiao-Gen Zhou
    • 1
  1. 1.The Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghaiChina
  2. 2.The University of Science and Technology Beijing (USTB)BeijingChina

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