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Li J.F.,Western Superconducting Technologies Company | Li J.F.,National Engineering Laboratory for Superconducting Materials Preparation | Zhang K.,Western Superconducting Technologies Company | Zhang K.,National Engineering Laboratory for Superconducting Materials Preparation | And 16 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2016

ITER toroidal field (TF) systems consist of 18 independent coils that are around the torus, whose primary function is to confine the plasma particles. The TF coil conductor is a cable-in-conduit conductor (CICC) made up of superconducting, Nb3Sn-based strands mixed with pure copper strands. As the only supplier in China, Western Superconducting Technologies Company, Ltd. (WST) will supply TF Nb3Sn strands using internal tin route for ITER, and over 6,000 km of Nb3Sn strands have been produced in the past four years. Main performance of Nb3Sn strands, including critical current, n value, wire diameter, Cu/non-Cu ratio, hysteresis loss and RRR are reported and analyzed in this paper. © 2002-2011 IEEE.


Li J.F.,Western Superconducting Technologies Co. | Li J.F.,National Engineering Laboratory for Superconducting Materials Preparation | Liu W.T.,Western Superconducting Technologies Co. | Liu W.T.,National Engineering Laboratory for Superconducting Materials Preparation | And 19 more authors.
Journal of Physics: Conference Series | Year: 2014

ITER Poloidal Field (PF) systems consist of 6 independent coils with different dimensions and require NbTi superconductor and copper strands. Western Superconducting Technologies Co.,Ltd.(WST) will supply PF2-5 NbTi strand for ITER, and over 14,000 km of NbTi strands have been produced in the past two years. Main performance of NbTi strands, including critical current, n value, wire diameter, Cu/non-Cu ratio, hysteresis loss and RRR are reported and analysed in this paper.


Zhang P.X.,Northwest Institute for Nonferrous Metal Research | Zhang P.X.,National Engineering Laboratory for Superconducting Materials Preparation | Li J.F.,National Engineering Laboratory for Superconducting Materials Preparation | Liu J.W.,National Engineering Laboratory for Superconducting Materials Preparation | And 10 more authors.
Superconductor Science and Technology | Year: 2010

Long multifilamentary Nb3Sn strands for ITER (International Thermonuclear Experimental Reactor) have been successfully fabricated by internal Sn and bronze processes, respectively. To improve the bonding of Nb and Cu and the diffusion between Sn and Cu for the internal tin process, the traditional RIT (rod-in-tube) and new hot extrusion (HE) processes have been employed to manufacture the Cu/Nb rods. The final internal tin process strand with a unit length of 3000-5000m comprises a Cu stabilizer, a Cu/Ta barrier and 19 subfilaments. Every subfilament consists of about 280-330 Nb filaments in a Cu matrix surrounding an Sn-Ti core. The bronze process Nb3Sn strands with 11581 and 9805 filaments of Nb7.5Ta with an unit length of more than 3km have been produced, respectively. The Ta or Nb barriers were used to compare the influence of different barrier materials on the fabrication process and superconducting properties of Nb3Sn strands. The microstructure details of two kinds of strands before and after heat treatment have been investigated by scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDX). The non-Cu Jc (12T, 4.2K) value of 812 Amm - 2 with hysteresis loss of 760 mJcm- 3 for the bronze-process strand and 1069Amm- 2 with hysteresis loss of 956mJcm- 3 for the internal tin-process strand have been obtained. The influence of microstructure on the transport property and hysteresis loss of strands has been discussed. © 2010 IOP Publishing Ltd.

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