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TY - UNPB AU - Liu, Y. AU - He, Y.Z. AU - Hu, X. AU - Wang, H.F. AU - Wang, J. AU - Wang, L. AU - Wang, S.H. AU - Yin, L. AU - Zhang, L. AU - Zhang, W. AU - Zhou, Q.G. ED - Casas, Joan ED - Schaa, Volker RW ED - Costa, Isidre ED - López, David ED - Prieto, Montserrat TI - The Cooling Structure for the Cryogenic Permanent Magnet Undulator Prototype at SSRF J2 - Proc. of MEDSI2016, Barcelona, Spain, 11-16 September 2016 CY - Barcelona, Spain T2 - Mechanical Engineering Design of Synchrotron Radiation Equipment and Instrumentation Conference T3 - 9 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland ER -