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In superconducting undulators (SCUs) that are currently operating at the Advanced Photon Source, the undulator magnets are indirectly cooled with liquid helium penetrating through channels in the magnet cores. The liquid helium is stored in a tank which is cooled by cryocoolers. However, a cryogen-free version of a superconducting undulator in which the undulator magnets are conduction-cooled, is also possible as it has been realized in the SCUs developed at ANKA in Karlsruhe Institute of Technology. We are currently working on a conceptual design of a conduction-cooled planar superconducting undulator. The measured load lines of cryocoolers and the measured thermal conductance of various thermal links are used in the thermal analysis. Also, various materials for the undulator magnet cores are being considered. This paper reports thermal design of conduction-cooled planar SCU.
Work supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
