Magnetization study of ITER-type internal-Sn Nb3Sn superconducting wire  

作　　者：张超武 周廉 Andre Sulpice Jean-Louis Soubeyroux Christophe Verwaerde GiaKy Hoang 张平祥 卢亚峰 唐先德 

机构地区：[1]Shaanxi University of Science and Technology, Xi'an 710021, China [2]Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China [3]CNRS/CRETA, BP 166, 38042 Grenoble, France [4]ALSTOM, 3 bis, avenue des 3 Chenes, 90018 Belfort, France

出　　处：《Chinese Physics B》2007年第6期1764-1769,共6页中国物理B（英文版）

摘　　要：Through magnetization measurement with a SQUID magnetometer the heat treatment optimization of an international thermonuclear experimental reactor （ITER）-type internal-Sn Nb3Sn superconducting wire has been investigated. The irreversibility temperature T^＊ （H）, which is mainly dependent on A15 phase composition, was obtained by a warming and cooling cycle at a fixed field. The hysteresis width △M（H） which reflects the flux pinning situation of the A15 phase is determined by the sweeping of magnetic field at a constant temperature. The results obtained from differently heat-treated samples show that the combination of T^＊ （H） with AM（H） measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675℃/128 h, which results in a composition closer to stoichiometric Nb3Sn and a state with best flux pinning.Through magnetization measurement with a SQUID magnetometer the heat treatment optimization of an international thermonuclear experimental reactor （ITER）-type internal-Sn Nb3Sn superconducting wire has been investigated. The irreversibility temperature T^＊ （H）, which is mainly dependent on A15 phase composition, was obtained by a warming and cooling cycle at a fixed field. The hysteresis width △M（H） which reflects the flux pinning situation of the A15 phase is determined by the sweeping of magnetic field at a constant temperature. The results obtained from differently heat-treated samples show that the combination of T^＊ （H） with AM（H） measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675℃/128 h, which results in a composition closer to stoichiometric Nb3Sn and a state with best flux pinning.

关 键 词：Nb3Sn superconducting wire internal-Sn process irreversibility temperature hysteresis width 

分 类 号：O511[理学—低温物理]