Effect of twist process on critical current and hysteresis loss of Nb3Sn strands

Zhang, P.X.; Zhou, Lian; Tang, X.D.; Liang, Ming; Li, C.G.; Wu, Yu; Guo, Yan; Yang, Manman; Feng, Yang; Liu, X.H.; Peide, Weng; Lu, Yafeng

doi:10.1016/j.physc.2007.04.268

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…As the only supplier of superconducting strand for ITER in China, Western Superconducting Technologies Co., Ltd (WST) has been engaged in the research and production of superconducting strand for many years. Experimental results and production status for both NbTi and Nb 3 Sn strand for ITER were widely reported [4][5][6][7][8]. In this paper, recent progress on the performance of internal-tin (IT) Nb 3 Sn strand and the heat treatment influence on microstructure and properties have been reported.…”

Section: Introductionmentioning

confidence: 97%

Progress on Internal-Tin Route Nb<sub>3</sub>Sn Superconducting Strand for ITER in China

Liu

Zhang

et al. 2013

MSF

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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.

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Section: Introductionmentioning

confidence: 97%

Progress on Internal-Tin Route Nb<sub>3</sub>Sn Superconducting Strand for ITER in China

Liu

Zhang

et al. 2013

MSF

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“…The hysteresis loss mainly results from proximity effect between filaments. Many researches focused on the influence of filament diameter, filament spacing, diffusion barrier material [5] and twist pitch [8] on the loss.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Strand for ITER at WST

Zhang

Guo³

et al. 2012

IEEE Trans. Appl. Supercond.

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Operated under high magnetic field ( 11 T), the toroidal field (TF) system consists of complex conductors using Nb Sn as superconducting material. According to the strand requirements for the ITER TF conductor, bronze processed Nb Sn strands with high superconducting performance have been manufactured using high tin content bronze at WST. The studies on filament diameter, diffusion barrier, sample heat treatment and annealing temperature have been carried out to enhance Nb Sn strand properties. The results of these investigations have been presented. The result indicates that the different filament diameter has a weak influence on the critical current value for the different reaction degree. In the manufacturing process the annealing temperature should be kept below 500 C to realize a high value. The continuous Nb Sn layer formation on the internal surface of the barrier causes a considerable increase of hysteresis loss when single Nb barrier is used. There is almost no difference of , hysteresis loss and grain morphology for two heat treatments: ITER heat treatment cycle B and WST heat treatment cycle.

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Performance optimization of internal tin process multifilamentary Nb3Sn strands

Zhang

Shi

et al. 2016

Fusion Engineering and Design

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Effect of twist process on critical current and hysteresis loss of Nb3Sn strands

Cited by 6 publications

References 12 publications

Progress on Internal-Tin Route Nb<sub>3</sub>Sn Superconducting Strand for ITER in China

Progress on Internal-Tin Route Nb<sub>3</sub>Sn Superconducting Strand for ITER in China

Optimization of Bronze Processed ${\hbox {Nb}}_{3}{\hbox {Sn}}$ Strand for ITER at WST

Performance optimization of internal tin process multifilamentary Nb3Sn strands

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