Zhibin Ren

Manufacturing of the ITER TF Conductors in China

The toroidal field (TF) coil conductor is a cable-in-conduit conductor made up of superconducting, Nb3Sn-based strands mixed with pure copper strands. The strands are assembled in a multistage cable around an open central spiral. The cable and its spiral are inserted into a stainless steel jacket. The jacket provides the helium confinement and must conform to the leak tightness standard defined herein. A technological complex has been developed at the Institute of Plasma Physics Chinese Academy of Sciences for serial production of ITER TF conductors is described. This technology was developed as a result of performing some R&D programs on selecting cabling parameters, welding technology, elaboration of cable insertion, compaction, and winding process. One qualification dummy TF conductor (760 m) and superconducting conductor (110 m) were successfully made. A new manufacturing complex was developed within the Institute of Plasma Physics Chinese Academy of Sciences for realization of this technology. The details of manufacturing procedures are described in this paper. It consists of a cabling workshop, and jacketing line equipped with full production machinery and test devices.

Manufacture and Measurement of a Fifty Kilo-Ampere Superconducting Transformer for the ASIPP Conductor Test Facility

To meet the performance test of the International Thermonuclear Experimental Reactor correction coil conductors, a 50-kA superconducting transformer has been manufactured, which allows rating of test samples under different operating conditions at the Institute of Plasma Physics of the Chinese Academy of Sciences (ASIPP). This transformer system is made up of two concentric layer-wound superconducting solenoids with the primary inside the secondary. The 50-kA secondary winding consists of 4-turn rectangular cable-in-conduit conductor type. This paper describes the design and manufacture techniques of the 50-kA transformer, including a secondary conductor. The secondary terminal design and manufacture are also discussed. Finally, the first test results of the 50-kA transformer are presented.

Design and Manufacture of the AC Superconducting Magnet for the Conductor Test Facility at ASIPP

To meet the ac loss measurement of the International Thermonuclear Experimental Reactor correction-coil conductors, an ac superconducting magnet has been designed and manufactured at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP), which can run at a frequency of 5 Hz and an amplitude field of 0.2 T. This ac magnet is made up of two layers of coils with NbTi superconducting strands and has good thermal conductive capacity. This paper describes the structural design and thermal analysis of the ac magnet with two different NbTi strands. The structural design of the compensation coil for the quench detection system is also discussed. Finally, the manufacture technique of the ac magnet is also presented.