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Liu J.,Western Superconductor Technologies Co. | Liu J.,State Engineering Laboratory of Superconducting Materials | Zhang K.,Western Superconductor Technologies Co. | Zhang K.,State Engineering Laboratory of Superconducting Materials | And 11 more authors.
Materials Science Forum | Year: 2013

Multi-filamentary Nb3Sn strand for ITER has been successfully fabricated by a conventional internal-tin (IT) route at Western Superconducting Technologies, Co. Ltd. All the performances of the IT Nb3Sn strand is able tomeet the ITER specifications. In 2010, one hundred kilograms of IT Nb3Sn strand has been cabled, jacketed and integrated into conductor sample titled with TFCN2 by ASIPP in China and tested in CRPP, Switzerland. After 1200 cycles warm-up and cooling down, Tcs of the TFCN2 Sultan sample at 10.78 T, 4.5 K are 6.35 K for the left leg and 6.37 K for the right leg, respectively, which is larger than the ITER lower limit of 5.7 K. This is the first successful Sultan sample made of Chinese Nb3Sn strand. In 2011, the influence of applied axial strain on critical current (Ic) was investigated using TFCN2 strand in the University of Twente, the Netherland. The irreversible degradation of Ic starts around +0.23% tensile intrinsic strain. The heat treatment influence of the duration at 650 °C on microstructure and performance was also studied. It was found that the fraction of un-reacted Nb after heat treatment is dependent on the position in the cross section. The hysteresis loss increases much faster than Ic when the duration at 650°C increased. © (2013) Trans Tech Publications, Switzerland.

Li C.G.,Northwestern Polytechnical University | Li C.G.,Western Superconductor Technologies Co. | Xiao C.J.,Western Superconductor Technologies Co. | Guan J.Q.,Western Superconductor Technologies Co. | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2010

The multifilamentary Nb3Sn strands with a diameter of 0.82 mm and different local area ratios of Nb to copper (LAR) have been successfully fabricated by an internal tin process in Western Superconducting Technologies Co., Ltd. (WST). The heat treatments have been completed in a vacuum condition. The Critical Current (Ic) and hysteresis loss of the strands are measured after different heat treatments according to ITER requirement. The maximum Ic is about 285 A (4.22 K, 12 T, 0.1 μV/cm ) and the hysteresis loss is 290∼ 410 mJ/cm3 (4.22 K, ±3 T) per strand unit volume. In this paper, the Ic and the hysteresis loss of the strands with different LARs and different heat treatments are investigated. It is a reference for fabricating the qualified Nb3Sn strands for ITER project in large scale in WST. © 2006 IEEE.

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