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

作者：Zhang Chao Wu^*; Zhou Lian; Sulpice Andre; Soubeyroux Jean Louis; Verwaerde Christophe; Hoang Gia Ky; Zhang Ping Xiang; Lu Ya Feng; Tang Xian De

来源：Chinese Physics, 2007, 16(6): 1764-1769.

• Nb3Sn superconducting wire
• internal-Sn process
• irreversibility temperature
• hysteresis width

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. Their reversibility 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 triangle 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 sampless how that the combination of T* (H) with triangle M(H) measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675 degrees C/128 h, which results in a composition closer to stoichiometric Nb3Sn and a state with best flux pinning.

• 出版日期2007-6
• 单位陕西科技大学; 西北有色金属研究院