Loss Measurement in a Cryogen-Free Bi-2223 HTS Dipole Magnet for Beam Line Switching

Jun Yoshida, Takaaki Morie, Atsushi Hashimoto, Hitoshi Mitsubori, Yukio Mikami, Keiichi Watazawa, Kichiji Hatanaka, Hiroshi Ueda, Mitsuhiro Fukuda, Tetsuhiko Yorita


1 被引用数 (Scopus)


High-temperature superconducting (HTS) magnets have several advantages for ac and pulse operation due to having a high critical temperature. However, fast magnetic field changes generate severe ac losses and eddy current losses. Therefore, loss estimation and reduction is a significant issue for HTS magnet cooling design. For future cooling design, we have measured losses of a Bi-2223 HTS magnet for beamline switching in the cyclotron facility at the Research Center of Nuclear Physics, Osaka University. The time-varying magnetic field losses for triangular wave excitation with a perpendicular magnetic field amplitude of 0.8 T in wire and a minimum period of 42 s were obtained from measured cryocooler temperatures and preliminary measured cooling capacity curve. The eddy current losses of the metal components were calculated using transient electromagnetic finite element analysis. The ac losses of the Bi-2223 wire were derived from the measured time-varying magnetic field losses and the calculated eddy current losses. The frequency dependence of their losses indicates the importance of accurate evaluation and reduction of the eddy current losses for the future magnet with higher charging speed.

ジャーナルIEEE Transactions on Applied Superconductivity
出版ステータスPublished - 6月 2017

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学


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