Y. Hishinuma, A. Kikuchi, T. Takeuchi, S. Yamada, A. Sagara


Development of low activation superconducting material for the feedback coil operated around core D-T plasma

Date of publication:

Nov. 2010

Key words:

22 IAEA Fusion Energy Conference, FTP/P1-18


The feedback coil is one of the important components to improve plasma confinement. The feedback coil must be installed near the core plasma and it will be affected by the heavy D-T neutron irradiation. We proposed MgB_2 superconducting wire as the candidate material for the feedback coil around core D-T plasma. MgB2 superconductor is one of the °»Low activation superconductors°… because the half-life of the induced radioactivity on the MgB2 superconductors is much shorter than that of Nb-based superconductors. We succeeded to fabricate 100 m class long and higher critical current density (Jc) MgB_2 mono-cored wire for fusion applications such as the feedback coil around D-T core plasma. Jc property of long MgB_2 wire was increased remarkably by the Cu addition using Mg_2Cu compound and its small solenoid coil had 2.62 T of central magnetic field. We found that MgB_2 wire became alternative materials to the commercial Nb-Ti wire under the neutron irradiation environment.

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