Development of MgB2 superconducting wire for the low activation superconducting magnet system operated around core D-T plasma

Yoshimitsu Hishinuma, Akihiro Kikuchi, Yusuke Shimada, Taro Kashiwai, Satoshi Hata, Shuichi Yamada, Takeo Muroga, Akio Sagara

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

MgB2 is one of the "low activation superconductors", because the half-life of the induced radio-activity on the MgB2 is much shorter than that of Nb-based superconductors such as NbTi, Nb3Sn and Nb3Al. MgB2 wire would become an alternative material for Nb-Ti wire for the Poloidal Field and correction feedback coils, if the critical current density (Jc) around the magnetic field of 4 T could be improved. We found that addition of Cu using the compound Mg2Cu was an effective method to enhance Jc and succeed to fabricate 100 m length of MgB2 wire with Cu addition. Jc of the 100 m long MgB2 with Cu addition was comparable to that of a NbTi wire, and the small solenoid coil using Cu added MgB2 wire reached a central magnetic field of 2.62 T. We found that MgB2 wire is an alternative material to commercial NbTi wires under the hard neutron irradiation in a fusion reactor. Furthermore, we also fabricated a Cu added MgB2 wire using isotope pure boron-11 (11B) powder as the boron source to reduce the radioactivity. The critical temperature (Tc) of the MgB2 wire using 11B powder was found to be 37 K, and Tc was found to be changed by different boron materials.

本文言語英語
ページ(範囲)1076-1080
ページ数5
ジャーナルFusion Engineering and Design
98-99
DOI
出版ステータス出版済み - 10 1 2015

All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 機械工学

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