A superconducting test coil using pure titanium pipe was developed by Efremov Institute of Russian Federation during the Engineering and Design Activity for the International Thermonuclear Experimental Reactor (ITER). The coil was also tested with the superconducting coil test facility of Japan Atomic Energy Research Institute (JAERI) and achieved the ITER requirement, maximum magnetic field of 13 T at rated current of 46 kA. A feature of the coil is use of pure titanium pipe as a jacket of the superconductor to prevent degradation of superconducting performance due to thermal strain caused by a difference of thermal contraction between the jacket and superconducting strands. The pure titanium pipe having 0.106 percent oxygen content was used based on the development to find optimum mechanical properties at 4 K, which was performed in collaboration with JAERI and Nippon Steel Corporation.
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