日本金属学会誌

J. Japan Inst. Metals, Vol. 71, No. 11 (2007),
pp. 959-965

A New Wire Fabrication Processing Using High Ga Content Cu-Ga Compound in V3Ga Compound Superconducting Wire

Yoshimitsu Hishinuma1, Akihiro Kikuchi2, Yasuo Iijima2, Takao Takeuchi2 and Arata Nishimura1

1Fusion Engineering Research Center, National Institute for Fusion Science, Toki 509-5292
2Superconducting Materials Center, National Institute for Materials Science, Tsukuba 305-0047

Abstract:

A superconducting magnet system is also one of the important components in an advanced magnetic confinement fusion reactor. Then it is required to have a higher magnetic field property to confine and maintain the steady-state burning deuterium (D)-tritium (T) fusion plasma in the large interspace during the long term operation. Burning plasma is sure to generate 14 MeV fusion neutrons during deuterium-tritium reaction, and fusion neutrons will be streamed and penetrated to superconducting magnet through large ports with damping neutron energy. Therefore, it is necessary to consider carefully not only superconducting property but also neutron irradiation property in superconducting materials for use in a future fusion reactor, and a ``low activation and high field superconducting magnet'' will be required to realize the fusion power plant beyond International Thermonuclear Experimental Reactor (ITER). V-based superconducting material has a much shorter decay time of induced radioactivity compared with the Nb-based materials. We thought that the V3Ga compound was one of the most promising materials for the ``low activation and higher field superconductors'' for an advanced fusion reactor. However, the present critical current density (Jc) property of V3Ga compound wire is insufficient for apply to fusion magnet applications. We investigated a new route PIT process using a high Ga content Cu-Ga compound in order to improve the superconducting property of the V3Ga compound wire.


(Received 2007/5/25)

Keywords:

V3Ga, high gallium content copper-gallium compound, Power-In-Tube process, microstructure, superconducting property


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