Author: Zhou, Q.G.
Paper Title Page
MOPE33
 The Cooling Structure for the Cryogenic Permanent Magnet Undulator Prototype at SSRF  
 
  • Y. Liu, Y.Z. He, X. Hu, H.F. Wang, J. Wang, L. Wang, S.H. Wang, L. Yin, W. Zhang, Q.G. Zhou
    SINAP, Shanghai, People’s Republic of China
  • L. Zhang
    SSRF, Shanghai, People’s Republic of China
  
  A cryogenic permanent magnet undulator (CPMU) prototype, based on the in-vacuum undulator technology, is under development at Shanghai Synchrotron Radiation Facility (SSRF). The prototype has a magnetic period length of 20 mm and effective peak field 1.04 T (gap 6 mm) at cryogenic temperature. The hybrid type magnetic assembly consists of NdFeB permanent magnet blocks and iron poles. A liquid nitrogen closed loop is adopted for cooling the magnet blocks to about 140 K. The cooling system is well designed to achieve a uniform temperature along the assembly and the temperature gradient is less than 1.5 K per meter. This paper presents the details of the cooling structure design for magnet blocks and iron poles, the mechanical structure of the copper-nickel foil with spring loaded tension mechanism and end tapers, as well as the test results off-line and on-line.  
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