テーマ解説
In-situ 法 MgB2 超伝導線材の開発
キーワード:
MgB2 superconducting wire,
critical current density,
quench energy margin,
strain tolerance,
prototype coils
2021 年 56 巻 6 号 p. 327-334
詳細
2021 年 56 巻 6 号 p. 327-334
The MgB2 wire has a great potential as a low-cost superconducting wire, which does not require cooling with liquid helium. We have been developing In situ MgB2 wires, which have practical Jc and Je at 10-20 K in a 5-T or lower magnetic field. A few prototype coils and magnets were made by the Wind&React method with km-class wires, which have a good homogeneity and a large quench energy margin. By using this margin, a magnet for klystron and a fast ramp-up MRI magnet were demonstrated successfully. An MgB2 magnet for Finger MRI was operated in a persistent mode with a superconducting joint. For realizing MgB2 coils made by the React&Wind method, the strain-tolerance of the reacted wire should be improved.
