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)
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
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.
Received: 24 July 2006
Revised: 12 March 2007
Accepted manuscript online:
PACS:
74.25.Ha
(Magnetic properties including vortex structures and related phenomena)
Fund: 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.
Cite this article:
Zhang Chao-Wu(张超武), Zhou Lian(周廉), Andre Sulpice, Jean-Louis Soubeyroux, Christophe Verwaerde, Gia Ky Hoang, Zhang Ping-Xiang(张平祥), Lu Ya-Feng(卢亚峰), and Tang Xian-De(唐先德) Magnetization study of ITER-type internal-Sn Nb3Sn superconducting wire 2007 Chinese Physics 16 1764
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