2002-2

Ta繊維強化型(Nb,Ti)₃Sn線の冷凍機冷却下における熱的安定性
Thermal Stability of Cryocooled Ta-Fiber-Reinforced Nb₃Sn Composite Wire

冷凍機冷却したTa繊維補強型Nb₃Sn線のMQE (Minimum Quench Energy)を温度，印加磁場10から14.5 T の範囲，通電電流密度の組み合わせを変えて測定した．温度マージンは各負荷条件下での常電導転移までの温度的余裕である．この結果，各温度において様々な負荷条件下で測定されたMQEは，温度マージンと比例関係にあることがわかった．

岡山大学　工学部：山本　剛，渡部賢司，村瀬　暁
東北大学　金属材料研究所：西島　元，渡辺和雄
日立電線：岩城源三

The MQE for the cryocooled Ta-fiber-reinforced Nb₃Sn composite wire was measured experimentally in various load conditions as the parameter of the temperature, applied magnetic-field, 10 - 14.5 T, and the transport current density. Temperature margin which is the abscissa axis is a difference between the operating temperature and the superconducting to normal transition temperature. It was found that MQE-temperature margin characteristics at each temperature showed a straight line even if loaded conditions varied.

Faculty of Engineering, Okayama University: T. Yamamoto, K. Watanabe, S. Murase
IMR, Tohoku University: G. Nishijima, K. Watanabe
Hitachi Cable, Ltd.：G. Iwaki
Reference: T. Yamamoto, K. Watanabe, S. Murase, G. Nishijima, K. Watanabe, A. Kimura,
"Thermal stability of reinforced Nb₃Sn composite conductor under cryocooled conditions", Cryogenic Engineering 38 (2003) 262. (in Japanese)