Development Of Nb3sn Superconducting Coil Manufacture Technology
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY(2013)
摘要
The nuclear magnetic resonance superconducting magnet technology is being developed in our laboratory. Because the upper critical magnetic field of NbTi alloy is not high enough, an Nb3Sn superconductor has to be used in the manufacture of magnets for 500 MHz and above. In this paper, an experimental Nb3Sn superconducting coil was manufactured to study the fabrication technology. The bobbin with Al2O3 ceramic coating is made of stainless steel. A vertical tube type vacuum heat treatment furnace was established for Nb3Sn formation. Heat treatment parameters for the Nb3Sn coil were done at 670 degrees C in vacuum. Vacuum pressure impregnation was done to strengthen the assembly. The Nb3Sn coil, the switch, and the current leads were joined together using superconducting solder matrix replacement method. In the test the maximum current of the Nb3Sn coil was 263 A, corresponding to a central magnetic field of 3.47 T. Persistent current mode operation was also successfully performed.
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关键词
Epoxy impregnation, heat treatment, Nb3Sn coil, superconducting joint
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