中国物理B ›› 2007, Vol. 16 ›› Issue (6): 1764-1769.doi: 10.1088/1009-1963/16/6/048

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

ChristopheVerwaerde1, GiaKyHoang1, AndreSulpice2, Jean-LouisSoubeyroux2, 张平祥3, 卢亚峰3, 唐先德3, 张超武4, 周廉4   

  1. (1)ALSTOM, 3 bis, avenue des 3 Chenes, 90018 Belfort, France ; (2)CNRS/CRETA, BP 166, 38042 Grenoble, France ; (3)Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China ; (4)Shaanxi University of Science and Technology, Xi'an 710021, China;Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China
  • 收稿日期:2006-07-24 修回日期:2007-03-12 出版日期:2007-06-20 发布日期:2007-06-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No~2005CB724004) and the France-China Collaboration Research Contract: CNRS No~722441.

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

Zhang Chao-Wu(张超武)a)b)†, Zhou Lian(周廉)a)b), Andre Sulpicec), Jean-Louis Soubeyrouxc), Christophe Verwaerded), Gia Ky Hoangd), Zhang Ping-Xiang(张平祥)b), Lu Ya-Feng(卢亚峰)b), and Tang Xian-De(唐先德)b)   

  1. a Shaanxi University of Science and Technology, Xi'an 710021, China; b Northwest Institute for Nonferrous Metal Research, Xi'an 710016, China; c CNRS/CRETA, BP 166, 38042 Grenoble, France; d ALSTOM, 3 bis, avenue des 3 Chenes, 90018 Belfort, France
  • Received:2006-07-24 Revised:2007-03-12 Online:2007-06-20 Published:2007-06-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No~2005CB724004) and the France-China Collaboration Research Contract: CNRS No~722441.

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摘要： Through magnetization measurement with a SQUID magnetometer the heat treatment optimization of an international thermonuclear experimental reactor (ITER)-type internal-Sn Nb$_{3}$Sn 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 $\Delta M(H)$ 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 $\Delta M(H)$ measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675$\,^\circ$C/128~h, which results in a composition closer to stoichiometric Nb$_{3}$Sn and a state with best flux pinning.

关键词: Nb3Sn superconducting wire, internal-Sn process, irreversibility temperature, hysteresis width

Abstract: Through magnetization measurement with a SQUID magnetometer the heat treatment optimization of an international thermonuclear experimental reactor (ITER)-type internal-Sn Nb$_{3}$Sn 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 $\Delta M(H)$ 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 $\Delta M(H)$ measurement is very effective for optimizing the heat reaction process. The heat treatment condition of the ITER-type wire is optimized at 675$\,^\circ$C/128 h, which results in a composition closer to stoichiometric Nb$_{3}$Sn and a state with best flux pinning.

Key words: Nb3Sn superconducting wire, internal-Sn process, irreversibility temperature, hysteresis width

中图分类号:  (Magnetic properties including vortex structures and related phenomena)

  • 74.25.Ha
84.71.Mn (Superconducting wires, fibers, and tapes) 85.25.Dq (Superconducting quantum interference devices (SQUIDs))